Tetraethyllead
Skeletal formula
Ball-and-stick model
Names
Preferred IUPAC name
Tetraethylplumbane
Other names
Lead tetraethyl

Tetraethyl lead

Tetra-ethyl lead
Identifiers
3D model (JSmol)
Abbreviations TEL
3903146
ChEBI
ChemSpider
ECHA InfoCard 100.000.979
EC Number
  • 201-075-4
68951
MeSH Tetraethyl+lead
RTECS number
  • TP4550000
UNII
UN number 1649
  • InChI=1S/4C2H5.Pb/c4*1-2;/h4*1H2,2H3; checkY
    Key: MRMOZBOQVYRSEM-UHFFFAOYSA-N checkY
  • CC[Pb](CC)(CC)CC
Properties
C8H20Pb
Molar mass 323.4 g·mol−1
Appearance Colorless liquid
Odor pleasant, sweet[1]
Density 1.653 g cm−3
Melting point −136 °C (−213 °F; 137 K)
Boiling point 84 to 85 °C (183 to 185 °F; 357 to 358 K) 15 mmHg
200 parts per billion (ppb) (20 °C)[1]
Vapor pressure 0.2 mmHg (20 °C)[1]
1.5198
Structure
Tetrahedral
0 D
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Flammable, extremely toxic
GHS labelling:
GHS06: Toxic GHS08: Health hazard GHS09: Environmental hazard
H300+H310+H330, H360, H373, H410
P201, P202, P260, P262, P264, P270, P271, P273, P280, P281, P284, P301+P310, P302+P350, P304+P340, P308+P313, P310, P314, P320, P321, P322, P330, P361, P363, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond
4
2
3
Flash point 73 °C (163 °F; 346 K)
Explosive limits 1.8%–?[1]
Lethal dose or concentration (LD, LC):
35 mg/kg (rat, oral)
17 mg/kg (rat, oral)
12.3 mg/kg (rat, oral)[2]
30 mg/kg (rabbit, oral)
24 mg/kg (rat, oral)[2]
850 mg/m3 (rat, 1 hr)[2]
650 mg/m3 (mouse, 7 hr)[2]
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 0.075 mg/m3 [skin][1]
REL (Recommended)
 TWA 0.075 mg/m3 [skin][1]
IDLH (Immediate danger)
 40 mg/m3 (as Pb)[1]
Related compounds
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)
Infobox references

Tetraethyllead (commonly styled tetraethyl lead), abbreviated TEL, is an organolead compound with the formula Pb(C2H5)4. It is a fuel additive, first being mixed with gasoline beginning in the 1920s as a patented octane rating booster that allowed engine compression to be raised substantially. This in turn increased vehicle performance and fuel economy.[3][4] TEL was first synthesised by German chemist Carl Jacob Löwig in 1853. American chemical engineer Thomas Midgley Jr., who was working for General Motors, was the first to discover its effectiveness as an antiknock agent in 1921, after spending several years attempting to find an additive that was both highly effective and inexpensive.

Concerns were later raised over the toxic effects of lead, especially on children.[5] On cars not designed to operate on leaded gasoline, lead and lead oxides coat the catalyst in catalytic converters, rendering them ineffective, and can sometimes foul spark plugs.[6] Starting in the 1970s, many countries began phasing out TEL in automotive fuel. In 2011 a study, backed by the United Nations, estimated that the removal of TEL had resulted in $2.4 trillion in annual benefits, and 1.2 million fewer premature deaths.[7]

TEL is still used as an additive in some grades of aviation fuel. Innospec has claimed to be the last firm legally making TEL but, as of 2013, TEL was being produced illegally by several companies in China.[8] In July 2021, the sale of leaded gasoline for cars was completely phased out worldwide, prompting the United Nations Environment Programme (UNEP) to declare an "official end" of its use in cars on August 30, 2021.[9]

Synthesis and properties

TEL is produced by reacting chloroethane with a sodium–lead alloy.[10][11]

4 NaPb + 4 CH3CH2Cl → Pb(CH3CH2)4 + 4 NaCl + 3 Pb

The product is recovered by steam distillation, leaving a sludge of lead and sodium chloride.[12] TEL is a viscous colorless liquid with a sweet odor.[13] Because TEL is charge neutral and contains an exterior of alkyl groups, it is highly lipophilic and soluble in petrol (gasoline). This property, which allows it to dissolve so evenly and effectively in motor fuel, also allows it to dissolve oils and fats well, and therefore, diffuse through the blood–brain barrier and accumulate within the limbic forebrain, frontal cortex, and hippocampus.[14]

Despite decades of research, no reactions were found to improve upon this process, which is rather difficult, involves metallic sodium, and converts only 25% of the lead to TEL. A related compound, tetramethyllead, was commercially produced by a different electrolytic reaction.[10] A process with lithium was developed but never put into practice.[15]

Reactions

A noteworthy feature of TEL is the weakness of its four C–Pb bonds. At the temperatures found in internal combustion engines, TEL decomposes completely into lead as well as combustible, short-lived ethyl radicals. Lead and lead oxide scavenge radical intermediates in combustion reactions. Engine knock is caused by a cool flame, an oscillating low-temperature combustion reaction that occurs before the proper, hot ignition. Lead quenches the pyrolysed radicals and thus kills the radical chain reaction that would sustain a cool flame, preventing it from disturbing the smooth ignition of the hot flame front. Lead itself is the reactive antiknock agent, and the ethyl groups serve as a gasoline-soluble carrier.[10]

When TEL burns, it produces not only carbon dioxide and water, but also lead and lead(II) oxide:[16]

Pb(C2H5)4 + 13 O2 → 8 CO2 + 10 H2O + Pb
2 Pb(C2H5)4 + 27 O2 → 16 CO2 + 20 H2O + 2 PbO

Pb and PbO would quickly over-accumulate and foul an engine. For this reason, 1,2-dichloroethane and 1,2-dibromoethane were also added to gasoline as lead scavengers—these agents form volatile lead(II) chloride and lead(II) bromide, respectively, which flush the lead from the engine and into the air:[16]

Pb(C2H5)4 + C2H4Cl2 + 16 O2 → 10 CO2 + 12 H2O + PbCl2
Pb(C2H5)4 + C2H4Br2 + 16 O2 → 10 CO2 + 12 H2O + PbBr2

In motor fuel

TEL was extensively used as a gasoline additive beginning in the 1920s,[17] wherein it served as an effective antiknock agent and reduced exhaust valve and valve seat wear. Concerns were raised in reputable journals of likely health outcomes of fine particles of lead in the atmosphere.[18][19][20]

Valve wear preventive

Tetraethyllead helps cool intake valves and is an excellent buffer against microwelds forming between exhaust valves and their seats.[21] Once these valves reopen, the microwelds pull apart and abrade the valves and seats, leading to valve recession. When TEL began to be phased out, the automotive industry began specifying hardened valve seats and upgraded materials which allow for high wear resistance without requiring lead.[22]

Antiknock agent

A gasoline-fuelled reciprocating engine requires fuel of sufficient octane rating to prevent uncontrolled combustion (preignition and detonation).[10] Antiknock agents allow the use of higher compression ratios for greater efficiency[23] and peak power.[24] Adding varying amounts of additives to gasoline allowed easy, inexpensive control of octane ratings. TEL offered the business advantage of being commercially profitable because its use for this purpose could be patented.[17] Aviation fuels with TEL used in WWII reached octane ratings of 150 to enable turbocharged and supercharged engines such as the Rolls-Royce Merlin and Griffon to reach high horsepower ratings at altitude.[25] In military aviation, TEL manipulation allowed a range of different fuels to be tailored for particular flight conditions.

In 1935 a licence to produce TEL was given to IG Farben, enabling the newly formed German Luftwaffe to use high-octane gasoline. A company, Ethyl GmbH, was formed that produced TEL at two sites in Germany with a government contract from 10 June 1936.[26]

In 1938 the United Kingdom Air Ministry contracted with ICI for the construction and operation of a TEL plant. A site was chosen at Holford Moss, near Plumley in Cheshire. Construction started in April 1939 and TEL was being produced by September 1940.[27]

"Ethyl Fluid"

Sign on an antique gasoline pump advertising tetraethyllead by the Ethyl Corporation

For mixing with raw gasoline, TEL was most commonly supplied in the form of "Ethyl Fluid", which consisted of TEL blended with 1,2-dichloroethane and 1,2-dibromoethane. Ethyl Fluid also contained a reddish dye to distinguish treated from untreated gasoline and discourage the use of leaded gasoline for other purposes such as cleaning.[28]

In the 1920s before safety procedures were strengthened, 17 workers for the Ethyl Corporation, DuPont, and Standard Oil died from the effects of exposure to lead.[17]

Ethyl Fluid's formulation consisted of:[10]

Dichloroethane and dibromoethane act in a synergistic manner, where equal or approximately equal quantities of both provide the best scavenging ability.[10]

Phaseout and ban

In most industrialized countries, a phaseout of TEL from road vehicle fuels was completed by the early 2000s because of concerns over air and soil lead levels and the accumulative neurotoxicity of lead. In the European Union, tetraethyllead has been classified as a Substance of Very High Concern and placed on the Candidate List for Authorisation under Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH).[29] Potential use of TEL would need to be authorised through the REACH authorisation procedure. While not a complete ban, it introduces significant obligations such as a mandatory analysis of alternatives and socioeconomic analysis.

The use of catalytic converters, mandated in the United States for 1975 and later model-year cars to meet tighter emissions regulations, started a gradual phase-out of leaded gasoline in the U.S.[30] The need for TEL was lessened by several advances in automotive engineering and petroleum chemistry. Safer methods for making higher-octane blending stocks such as reformate and iso-octane reduced the need to rely on TEL, as did other antiknock additives of varying toxicity including metallic compounds such as methylcyclopentadienyl manganese tricarbonyl (MMT) as well as oxygenates including methyl tertiary-butyl ether (MTBE), tert-amyl methyl ether (TAME), and ethyl tert-butyl ether (ETBE).

The first country to completely ban leaded gasoline was Japan in 1986.[31]

Since January 1993 all gasoline powered cars sold in the European Union and the United Kingdom have been required to use unleaded fuel. This was to comply with the Euro 1 emission standards which mandated that all new cars to be fitted with a catalytic converter.[32] Unleaded fuel was first introduced in the United Kingdom in June 1986.[33]

Leaded gasoline was removed from the forecourts in the United Kingdom on January 1, 2000, and a Lead Replacement Petrol was introduced although this was largely withdrawn by 2003 due to dwindling sales.[34][35] An exemption to the ban exists for owners of classic cars.

Vehicles designed and built to run on leaded fuel often require modification to run on unleaded gasoline. These modifications fall into two categories: those required for physical compatibility with unleaded fuel, and those performed to compensate for the relatively low octane of early unleaded fuels. Physical compatibility requires the installation of hardened exhaust valves and seats. Compatibility with reduced octane was addressed by reducing compression, generally by installing thicker cylinder head gaskets and/or rebuilding the engine with compression-reducing pistons, although modern high-octane unleaded gasoline has eliminated the need to decrease compression ratios.

Leaded gasoline remained legal as of late 2014[36] in parts of Algeria, Iraq, Yemen, Myanmar, North Korea, and Afghanistan.[37][38] North Korea and Myanmar purchased their TEL from China, while Algeria, Iraq, and Yemen purchased it from the specialty chemical company Innospec, the world's sole remaining legal manufacturer of TEL.[39] In 2011 several Innospec executives were charged and imprisoned for bribing various government state-owned oil companies to approve the sale of their TEL products.[38][40]

As of June 2016 the UNEP-sponsored phase-out was nearly complete: only Algeria, Iraq, and Yemen continued widespread use of leaded gasoline, although not exclusively.[41] In July 2021, Algeria had halted its sale.[9]

Leaded-fuel bans

Leaded-fuel bans for road vehicles came into effect as follows:

Africa
  • Egypt: 1999
  • South Africa: 2006
  • Leaded petrol was supposed to be completely phased out continent-wide on 1 January 2006, following a ban initiated from the 2002 Earth Summit.[78] However, in Algeria refineries needed to be altered; as a result, leaded fuel remained available in parts of Algeria,[38] with phaseout scheduled for 2016. After the Algerian Government outlawed the sale of leaded petrol throughout all of Algeria, leaded petrol has now been effectively phased out.[79][80]

In motor racing

Leaded fuel was commonly used in professional motor racing, until its phase out beginning in the 1990s. Since 1993, Formula One racing cars have been required to use fuel containing no more than 5 mg/L of lead.[81]

NASCAR began experimentation in 1998 with an unleaded fuel, and in 2006 began switching the national series to unleaded fuel, completing the transition at the Fontana round in February 2007 when the premier class switched. This was influenced after blood tests of NASCAR teams revealed elevated blood lead levels.[82][83]

Aviation gasoline

TEL remains an ingredient of 100 octane avgas for piston-engine aircraft. The current formulation of 100LL (low lead, blue) aviation gasoline contains 2.12 grams per US gallon (0.56 g/L) of TEL, half the amount of the previous 100/130 (green) octane avgas (at 4.24 grams per gallon),[84] and twice as much as the 1 gram per gallon permitted in regular automotive leaded gasoline prior to 1988 and substantially greater than the allowed 0.001 grams per gallon in automotive unleaded gasoline sold in the United States today.[85] The United States Environmental Protection Agency, FAA, and others are working on economically feasible replacements for leaded avgas, which still releases 100 tons of lead every year.[86] Children living near airports servicing small (piston-engine) aircraft have measurably higher concentrations of lead in their blood.[87]

Alternative antiknock agents

Antiknock agents are classed as high-percentage additives, such as alcohol, and low-percentage additives based on heavy elements. Since the main problem with TEL is its lead content, many alternative additives that contain less poisonous metals have been examined. A manganese-carrying additive, methylcyclopentadienyl manganese tricarbonyl (MMT or methylcymantrene), was used for a time as an antiknock agent, though its safety is controversial and it has been the subject of bans and lawsuits. Ferrocene, an organometallic compound of iron, is also used as an antiknock agent although with some significant drawbacks.[88]

High-percentage additives are organic compounds that do not contain metals, but require much higher blending ratios, such as 20–30% for benzene and ethanol. It had been established by 1921 that ethanol was an effective antiknock agent, but TEL was introduced instead mainly for commercial reasons.[30] Oxygenates such as TAME derived from natural gas, MTBE made from methanol, and ethanol-derived ETBE, have largely supplanted TEL. MTBE has environmental risks of its own and there are also bans on its use.

Improvements to gasoline itself decrease the need for antiknock additives. Synthetic iso-octane and alkylate are examples of such blending stocks. Benzene and other high-octane aromatics can be also blended to raise the octane number, but they are disfavored today because of toxicity and carcinogenicity.

Toxicity

6 mL of tetraethyllead is enough to induce severe lead poisoning.[89] The hazards of TEL content are heightened due to the compound's volatility and high lipophilicity, enabling it to easily cross the blood–brain barrier.

Early symptoms of acute exposure to tetraethyllead can manifest as irritation of the eyes and skin, sneezing, fever, vomiting, and a metallic taste in the mouth. Later symptoms of acute TEL poisoning include pulmonary edema, anemia, ataxia, convulsions, severe weight loss, delirium, irritability, hallucinations, nightmares, fever, muscle and joint pain, swelling of the brain, coma, and damage to cardiovascular and renal organs.[90] Chronic exposure to TEL can cause long-term negative effects such as memory loss, delayed reflexes, neurological problems, insomnia, tremors, psychosis, loss of attention, and an overall decrease in IQ and cognitive function.[91]

The carcinogenity of tetraethyllead is debatable. It is believed to harm the male reproductive system and cause birth defects.[92]

Concerns over the toxicity of lead[93] eventually led to the ban on TEL in automobile gasoline in many countries. Some neurologists have speculated that the lead phaseout may have caused average IQ levels to rise by several points in the US (by reducing cumulative brain damage throughout the population, especially in the young). For the entire US population, during and after the TEL phaseout, the mean blood lead level dropped from 16 μg/dL in 1976 to only 3 μg/dL in 1991.[94] The U.S. Centers of Disease control previously labelled children with 10 µg/dL or more as having a "blood lead level of concern". In 2021, the level was lowered in accordance with the average lead level in the U.S. decreasing to 3.5 µg/dL or more as having a "blood lead level of concern".[95][96]

History

In 1853, German chemist Karl Jacob Löwig (1803–1890) first prepared what he claimed was Pb2(C2H5)3 from ethyl iodide and an alloy of lead and sodium.[97] In 1859, English chemist George Bowdler Buckton (1818–1905) reported what he claimed was Pb(C2H5)2 from zinc ethyl (Zn(C2H5)2) and lead(II) chloride.[98] Later authors credit both methods of preparation with producing tetraethyl lead.[99]

In fuel

TEL remained unimportant commercially until the 1920s.[30] In 1921, at the direction of DuPont Corporation, which manufactured TEL, it was found to be an effective antiknock agent by Thomas Midgley, working under Charles Kettering at General Motors Corporation Research.[100] General Motors patented the use of TEL as an antiknock agent and used the name "Ethyl" that had been proposed by Kettering in its marketing materials, thereby avoiding the negative connotation of the word "lead".[30] Early research into "engine knocking" (also called "pinging" or "pinking") was also led by A.H. Gibson and Harry Ricardo in England and Thomas Boyd in the United States. The discovery that lead additives modified this behavior led to the widespread adoption of their use in the 1920s, and therefore more powerful, higher-compression engines.[17] In 1924, Standard Oil of New Jersey (ESSO/EXXON) and General Motors created the Ethyl Gasoline Corporation to produce and market TEL. Deepwater, New Jersey, across the river from Wilmington, was the site for production of some of DuPont's most important chemicals, particularly TEL. After TEL production at the Bayway Refinery was shut down, Deepwater was the only plant in the Western hemisphere producing TEL up to 1948, when it accounted for the bulk of the Dupont/Deepwater's production.[101]

Initial controversy

The toxicity of concentrated TEL was recognized early on, as lead had been recognized since the 19th century as a dangerous substance that could cause lead poisoning. In 1924, a public controversy arose over the "loony gas", after five[102] workers died, and many others were severely injured, in Standard Oil refineries in New Jersey.[103] There had also been a private controversy for two years prior to this controversy; several public health experts, including Alice Hamilton and Yandell Henderson, engaged Midgley and Kettering with letters warning of the dangers to public health.[17] After the death of the workers, dozens of newspapers reported on the issue.[104] The New York Times editorialized in 1924 that the deaths should not interfere with the production of more powerful fuel.[17]

To settle the issue, the U.S. Public Health Service conducted a conference in 1925, and the sales of TEL were voluntarily suspended for one year to conduct a hazard assessment.[10][30][105] The conference was initially expected to last for several days, but reportedly the conference decided that evaluating presentations on alternative anti-knock agents was not "its province", so it lasted a single day. Kettering and Midgley stated that no alternatives for anti-knocking were available, although private memos showed discussion of such agents. One commonly discussed agent was ethanol. The Public Health Service created a committee that reviewed a government-sponsored study of workers and an Ethyl lab test, and concluded that while leaded gasoline should not be banned, it should continue to be investigated.[17] The low concentrations present in gasoline and exhaust were not perceived as immediately dangerous. A U.S. Surgeon General committee issued a report in 1926 that concluded there was no real evidence that the sale of TEL was hazardous to human health but urged further study.[30] In the years that followed, research was heavily funded by the lead industry; in 1943, Randolph Byers found children with lead poisoning had behavior problems, but the Lead Industries Association threatened him with a lawsuit and the research ended.[17][106]

In the late 1920s, Robert A. Kehoe of the University of Cincinnati was the Ethyl Corporation's chief medical consultant and one of the lead industry's staunchest advocates, who would not be discredited until decades later by Dr. Clair Patterson's work on human lead burdens (see below) and other studies.[30] In 1928, Dr. Kehoe expressed the opinion that there was no basis for concluding that leaded fuels posed any health threat.[30] He convinced the Surgeon General that the dose–response relationship of lead had "no effect" below a certain threshold.[107] As the head of Kettering Laboratories for many years, Kehoe would become a chief promoter of the safety of TEL, an influence that did not begin to wane until about the early 1960s. But by the 1970s, the general opinion of the safety of TEL would change, and by 1976 the U.S. government would begin to require the phaseout of this product.

In the late 1940s and early 1950s, Clair Cameron Patterson accidentally discovered the pollution caused by TEL in the environment while determining the age of the Earth. As he attempted to measure lead content of very old rocks, and the time it took uranium to decay into lead, the readings were made inaccurate by lead in the environment that contaminated his samples. He was then forced to work in a cleanroom to keep his samples uncontaminated by environmental pollution of lead. After coming up with a fairly accurate estimate of the age of the Earth, he turned to investigating the lead contamination problem by examining ice cores from countries such as Greenland. He realized that the lead contamination in the environment dated from about the time that TEL became widely used as a fuel additive in gasoline. Being aware of the health dangers posed by lead and suspicious of the pollution caused by TEL, he became one of the earliest and most effective proponents of removing it from use.[108][109]

In the 1960s, the first clinical works were published proving the toxicity of this compound in humans, e.g. by Mirosław Jan Stasik.[90]

Modern findings

In the 1970s, Herbert Needleman found that higher lead levels in children were correlated with decreased school performance. Needleman was repeatedly accused of scientific misconduct by individuals within the lead industry, but he was eventually cleared by a scientific advisory council.[17] Needleman also wrote the average US child's blood lead level was 13.7 μg/dL in 1976 and that Patterson believed that everyone was to some degree poisoned by TEL in gasoline.[110]

In the U.S. in 1973, the United States Environmental Protection Agency issued regulations to reduce the lead content of leaded gasoline over a series of annual phases, which therefore came to be known as the "lead phasedown" program. EPA's rules were issued under section 211 of the Clean Air Act, as amended 1970. The Ethyl Corp challenged the EPA regulations in Federal court. Although the EPA's regulation was initially invalidated,[17] the EPA won the case on appeal, so the TEL phasedown began to be implemented in 1976. Leaded gas was banned in vehicles with catalytic converters in 1975 due to damage of catalytic converters but it continued to be sold for vehicles without catalytic converters.[111] Additional regulatory changes were made by EPA over the next decade (including adoption of a trading market in "lead credits" in 1982 that became the precursor of the Acid Rain Allowance Market, adopted in 1990 for SO2), but the decisive rule was issued in 1985.[112] The EPA mandated that lead additive be reduced by 91 percent by the end of 1986. A 1994 study had indicated that the concentration of lead in the blood of the U.S. population had dropped 78% from 1976 to 1991.[113] The U.S. phasedown regulations also were due in great part to studies conducted by Philip J. Landrigan.[114]

In Europe, Professor Derek Bryce-Smith was among the first to highlight the potential dangers of TEL and became a leading campaigner for removal of lead additives from petrol.[115]

From 1 January 1996, the U.S. Clean Air Act banned the sale of leaded fuel for use in on-road vehicles although that year the US EPA indicated that TEL could still be used in aircraft, racing cars, farm equipment, and marine engines.[116] Thus, what had begun in the U.S. as a phasedown ultimately ended in a phase-out for on-road vehicle TEL. Similar bans in other countries have resulted in lowering levels of lead in people's bloodstreams.[117][118]

Taking cue from the domestic programs, the U.S. Agency for International Development undertook an initiative to reduce tetraethyl lead use in other countries, notably its efforts in Egypt begun in 1995. In 1996, with the cooperation of the U.S. AID, Egypt took almost all of the lead out of its gasoline. The success in Egypt provided a model for AID efforts worldwide.[119]

By 2000, the TEL industry had moved the major portion of their sales to developing countries whose governments they lobbied against phasing out leaded gasoline.[30] Leaded gasoline was withdrawn entirely from the European Union market on 1 January 2000, although it had been banned much earlier in most member states. Other countries also phased out TEL.[120] India banned leaded petrol in March 2000.[70]

By 2011, the United Nations announced that it had been successful in phasing out leaded gasoline worldwide. "Ridding the world of leaded petrol, with the United Nations leading the effort in developing countries, has resulted in $2.4 trillion in annual benefits, 1.2 million fewer premature deaths, higher overall intelligence and 58 million fewer crimes", the United Nations Environmental Programme said.[7][121] The announcement was slightly premature, as a few countries still had leaded gasoline for sale as of 2017.[41] On 30 August 2021 the United Nations Environment Programme announced that leaded gasoline had been eliminated. The final stocks of the product were used up in Algeria, which had continued to produce leaded gasoline until July 2021.[122][123]

Effect on crime rates

Reduction in the average blood lead level is believed to have been a major cause for falling violent crime rates in the United States.[124] A statistically significant correlation has been found between the usage rate of leaded gasoline and violent crime: the violent crime curve virtually tracks the lead exposure curve with a 22-year time lag.[94][125] After the ban on TEL, blood lead levels in U.S. children dramatically decreased.[94] Researchers including Amherst College economist Jessica Wolpaw Reyes, Department of Housing and Urban Development consultant Rick Nevin, and Howard Mielke of Tulane University say that declining exposure to lead is responsible for an up to 56% decline in crime from 1992 to 2002.[126] Taking into consideration other factors that are believed to have increased crime rates over that period, Reyes found that the reduced exposure to lead led to an actual decline of 34% over that period.[127][128]

Although leaded gasoline is largely gone in North America, it has left high concentrations of lead in the soil adjacent to roads that were heavily used prior to its phaseout. Children are particularly at risk if they ingest this soil.[129]

See also

References

  1. 1 2 3 4 5 6 7 NIOSH Pocket Guide to Chemical Hazards. "#0601". National Institute for Occupational Safety and Health (NIOSH).
  2. 1 2 3 4 "Tetraethyl lead". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  3. ↑ "Tetra-Ethyl Lead as an Addition to Petrol". British Medical Journal. 1 (3504): 366–7. 3 March 1928. doi:10.1136/bmj.1.3504.366. PMC 2455205. PMID 20773729.
  4. ↑ "After Lead?", Popular Science (October 1987 ed.), Bonnier Corporation, p. 94, October 1987
  5. ↑ "LEAD EXPOSURE IN CHILDHOOD LINKED TO LOWER IQ, LOWER STATUS: Leaded gasoline creates a natural experiment in long-term study". Duke University. 28 March 2017. Retrieved 11 March 2022.
  6. ↑ Operator's Manual: Army Model U-8F Aircraft. Headquarters, Department of the Army (U.S.). 21 March 1978. p. 2−15.
  7. 1 2 "Phase-out of leaded petrol brings huge health and cost benefits". UN News. 27 October 2011. Retrieved 28 November 2020.
  8. ↑ Chung, Kevin (16 August 2013). TEL for MOGAS manufacture in China (PDF) (Report). Summer Hill, NSW, Australia: The LEAD Group, Inc. Retrieved 14 January 2018.
  9. 1 2 "It's official: You can't buy leaded gasoline for cars anywhere on Earth". cbc.ca. CBC News. 30 August 2021. Retrieved 30 August 2021.
  10. 1 2 3 4 5 6 7 Seyferth, D. (2003). "The Rise and Fall of Tetraethyllead. 2". Organometallics. 22 (25): 5154–5178. doi:10.1021/om030621b.
  11. ↑ Jewkes, John; Sawers, David; Richard, Richard (1969). The sources of invention (2nd ed.). New York: W. W. Norton. pp. 235–237. ISBN 978-0-393-00502-8. Retrieved 11 July 2018.
  12. ↑ Davis, William E. (1973). Emission Study of Industrial Sources of Lead Air Pollutants, 1970. United States: Environmental Protection Agency. p. 57.
  13. ↑ Dara, S.S.; Shete, S.D. S. Chand's Applied Chemistry Volume 2 (For 2nd Semester of Mumbai University). S. Chand Publishing. p. 93. ISBN 978-81-219-3495-4.
  14. ↑ Cadet, J. L.; Bolla, K. I. (2007). "Environmental Toxins and Disorders of the Nervous System". Neurology and Clinical Neuroscience: 1477–1488. doi:10.1016/B978-0-323-03354-1.50115-2. ISBN 9780323033541.
  15. ↑ Seyferth, Dietmar (December 2003). "The Rise and Fall of Tetraethyllead. 2". Organometallics. 22 (25): 5174. doi:10.1021/om030621b. ISSN 0276-7333.
  16. 1 2 Kloprogge, J. Theo; Ponce, Concepcion P.; Loomis, Tom (18 November 2020). The Periodic Table: Nature's Building Blocks: An Introduction to the Naturally Occurring Elements, Their Origins and Their Uses. Elsevier. p. 826. ISBN 978-0-12-821538-8.
  17. 1 2 3 4 5 6 7 8 9 10 Kovarik, W. (2005). "Ethyl-leaded gasoline: how a classic occupational disease became an international public health disaster" (PDF). Int J Occup Environ Health. 11 (4): 384–97. doi:10.1179/oeh.2005.11.4.384. PMID 16350473. S2CID 44633845. Archived from the original (PDF) on 11 July 2014.
  18. ↑ Seyferth, Dietmar (June 2003). "The Rise and Fall of Tetraethyllead. 1. Discovery and Slow Development in European Universities, 1853−1920". Organometallics. 22 (12): 2346–2357. doi:10.1021/om030245v.
  19. ↑ Seyferth, Dietmar (December 2003). "The Rise and Fall of Tetraethyllead. 2" (PDF). Organometallics. 22 (25): 5154–5178. doi:10.1021/om030621b. Retrieved 7 October 2018.
  20. ↑ "A New Automobile Fuel". The Advertiser (Adelaide). South Australia. 16 January 1924. p. 15. Retrieved 25 April 2017 – via National Library of Australia.
  21. ↑ "1972 Imperial & Chrysler Engine Performance Facts & Fixes Service Book (Session 291)". Online Imperial Club.
  22. ↑ "1973 Imperial and Chrysler Clean Air System Reference Service Repair Book from the Master Technician's Service Conference (Session 302)". Online Imperial Club.
  23. ↑ Caris, D. F.; Nelson, E. E. (1959). A New Look at High Compression Engines (Technical report). Society of Automotive Engineers. doi:10.4271/590015. 590015.
  24. ↑ Loeb, A. P. (Fall 1995). "Birth of the Kettering Doctrine: Fordism, Sloanism and Tetraethyl Lead" (PDF). Business and Economic History. 24 (2). Archived (PDF) from the original on 27 October 2015.
  25. ↑ F. R. Banks (1978). I Kept No Diary. Airlife Publishing, Ltd. ISBN 978-0-9504543-9-9.
  26. ↑ Rainer Karlsch, Raymond G. Stokes. "Faktor Öl". Die Mineralölwirtschaft in Deutschland 1859–1974. C. H. Beck, München, 2003, ISBN 3-406-50276-8, p. 187.
  27. ↑ "Northwich". Octel Bromine Works. Retrieved 9 January 2022.
  28. ↑ Seyferth, Dietmar (2003). "The Rise and Fall of Tetraethyllead". Organometallics. 22 (25): 5154–5178. doi:10.1021/om030621b.
  29. ↑ Inclusion of Substances of Very High Concern in the Candidate List – Decision of the European Chemicals Agency ED/169/2012
  30. 1 2 3 4 5 6 7 8 9 Kitman, J. (2 March 2000). "The Secret History of Lead." The Nation. Retrieved 17 August 2009.
  31. ↑ Hofverberg, Elin (14 April 2022). "The History of the Elimination of Leaded Gasoline". In Custodia Legis: Law Librarians of Congress. Retrieved 4 January 2023.
  32. ↑ "Euro emissions standards". The AA. Retrieved 31 December 2022.
  33. ↑ "Throwback Thursday 1989: the switchover to unleaded petrol". Autocar. Retrieved 31 December 2022.
  34. ↑ Clark, Andrew (15 August 2002). "Petrol for older cars about to disappear". The Guardian.
  35. ↑ "Guide to lead replacement petrol (LRP)". The AA. Retrieved 1 January 2023.
  36. ↑ Peeples, Lynne (9 August 2014). "Corrupt Executives Sent To Prison For Pumping Toxic Leaded Fuel Overseas". Huffington Post.
  37. ↑ "UNEP 10th general meeting strategy presentation" (PDF). Archived from the original (PDF) on 3 December 2013.
  38. 1 2 3 Robert Taylor (17 June 2011). "Countries where Leaded Petrol is Possibly Still Sold for Road Use". The LEAD Group.
  39. ↑ "Octane Additives". Innospec.
  40. ↑ "First Enforcement Action of 2011 Involves a Former Executive Officer". FCPA Professor. 25 January 2011.
  41. 1 2 "Leaded Petrol Phase-out: Global Status as at March 2017" (PDF). Partnership for Clean Fuels and Vehicles. Archived from the original (PDF) on 15 November 2017. Retrieved 28 April 2018.
  42. ↑ OECD Environmental Performance Reviews: Czech Republic 2005. OECD Publishing. 11 October 2005. ISBN 9789264011793 – via Google Books.
  43. ↑ "Regulering af brændstoffer" (in Danish). Archived from the original on 11 August 2014. Retrieved 13 March 2016.
  44. ↑ European Union Member States which had not already withdrawn it from sale experienced the EU-wide ban from 1 January 2000. Earlier regulation had prevented the sale or production of cars using leaded petrol after 1992.
  45. ↑ "Bensiiniopas" (PDF) (in Finnish). Archived (PDF) from the original on 9 October 2015. Retrieved 28 December 2017.
  46. ↑ OECD Environmental Performance Reviews: France 2005. OECD. 26 September 2005. ISBN 9789264009141.
  47. ↑ "Stirbt das Blei, dann lebt der Wald" [If lead dies, the forest lives]. Die Zeit (in German). 8 November 2013.
  48. ↑ "Motor Fuel (Composition and Content) Act 2001". Gibraltar Laws. 5 April 2001.
  49. ↑ OECD Environmental Performance Reviews: Greece 2009. OECD Publishing. 15 March 2010. ISBN 9789264061330 – via Google Books.
  50. ↑ OECD Environmental Performance Reviews: Italy 2002. OECD Publishing. 29 January 2003. ISBN 9789264199163 – via Google Books.
  51. ↑ OECD Environmental Performance Reviews: Netherlands 2003. OECD. 2 June 2003. ISBN 9789264101005.
  52. ↑ "Zakończenie produkcji Etyliny 94" (in Polish). 12 December 2000. Archived from the original on 22 October 2020.
  53. ↑ OECD Environmental Performance Reviews: Slovenia 2012. OECD Publishing. 6 June 2012. ISBN 9789264169265 – via Google Books.
  54. ↑ "Prohibición de la venta de gasolina con plomo" (in Spanish). Ministerio de Industria, Energía y Turismo. Retrieved 2 February 2018.
  55. ↑ "Dispare benzina cu plumb". Evenimentul Zilei (in Romanian). 27 July 2004. Archived from the original on 29 July 2013.
  56. ↑ Постановление ГД ФС РФ от 15 November 2002 N 3302-III ГД О проекте Федерального закона N 209067-3 "Об ограничении оборота этилированного бензина в Российской Федерации" [Resolution of the State Duma of the Federal Assembly of the Russian Federation of 15 November 2002 N 3302-III of the State Duma on the Draft Federal Law N 209067-3 "On Limiting the Turnover of Leaded Petrol in the Russian Federation"] (in Russian). Archived from the original on 29 July 2013. Retrieved 24 March 2013.
  57. ↑ A. Muslibegović (8 June 2010). "Zbogom olovnom benzinu!" [Goodbye to leaded gasoline!] (in Serbian).
  58. ↑ "Blyad bensin förbjuds från 1 mars" [Leaded petrol is banned from 1 March]. Dagens Nyheter (in Swedish). 20 January 1995. Retrieved 8 September 2022.
  59. ↑ "Four-star petrol banned". BBC News. 1 December 1998. Archived from the original on 10 August 2017. Retrieved 2 February 2018.
  60. ↑ Wang ST, Pizzolato S, Demshar HP, Smith LF (1997). "Decline in blood lead in Ontario children correlated to decreasing consumption of leaded gasoline, 1983–1992". Clinical Chemistry. 43 (7): 1251–52. doi:10.1093/clinchem/43.7.1251. PMID 9216473.
  61. ↑ "Last country on Earth to use leaded gasoline in cars bans its sale". 3 September 2021.
  62. ↑ "Combustibles: Libres de plomo y bajos en azufre" [Fuels: Lead free and low in sulfur] (in Spanish). 8 April 2016.
  63. ↑ "Gasolina con plomo tiene los días contados" [Leaded gasoline has its days numbered] (in Spanish). 6 October 2001.
  64. 1 2 3 Eichler, Anja; Gramlich, Gabriela; Kellerhals, Thomas; Tobler, Leonhard; Schwikowski, Margit (6 March 2015). "Pb pollution from leaded gasoline in South America in the context of a 2000-year metallurgical history". Science Advances. 1 (2): e1400196. Bibcode:2015SciA....1E0196E. doi:10.1126/sciadv.1400196. PMC 4643815. PMID 26601147.
  65. ↑ "Brazilian ANP's Resolution No. 01/1989: Provides for standard gasoline specifications for consumption and emissions tests (including Lead)". Brazil: Agência Nacional do Petróleo, Gás Natural e Biocombustíveis (ANP). 31 January 1989. Retrieved 16 July 2023.
  66. ↑ "ENAP dejará de distribuir gasolina con plomo el sabado" [ENAP will stop distributing leaded gasoline on Saturday] (in Spanish). 26 March 2001. Retrieved 1 August 2014.
  67. ↑ Aldana, Gabriel Reyes (10 July 1997). "La gasolina no tiene plomo" [Gasoline is unleaded]. El Tiempo (in Spanish).
  68. ↑ "Udelar y contaminación con plomo: trabajo continuo" [University of the Republic and lead contamination: continuous work] (in Spanish). 16 August 2019. Archived from the original on 21 May 2021.
  69. 1 2 3 "Highly polluting leaded petrol now eradicated from the world, says UN". BBC News. 31 August 2021. Retrieved 1 September 2021.
  70. 1 2 Venkatesh, Thuppil (4 June 2015). "A Surprising Source of Lead Poisoning: India's Idols". The Wall Street Journal. Retrieved 18 April 2016.
  71. 1 2 https://wedocs.unep.org/bitstream/handle/20.500.11822/25422/MapWorldLead_March2018.pdf?sequence=1&isAllowed=y
  72. 1 2 https://wedocs.unep.org/bitstream/handle/20.500.11822/25756/MapWorldLead_July2018.pdf?sequence=1&isAllowed=y
  73. ↑ Kadir, M. M.; Janjua, N. Z.; Kristensen, S.; Fatmi, Z.; Sathiakumar, N. (2008). "Status of children's blood lead levels in Pakistan: implications for research and policy". Public Health. 122 (7): 708–15. doi:10.1016/j.puhe.2007.08.012. PMC 2494596. PMID 18359052.
  74. ↑ 職業安全衛生法-"【四烷基鉛中毒預防規則】". Retrieved 15 July 2022.
    法規類別： 行政 ＞ 勞動部 ＞ 職業安全衛生目
  75. ↑ "Çevre ve Orman Bakanlığından: Benzin ve Motorin Kalitesi Yönetmeliği (2003/17/AT ile değişik 98/70/AT)" [From the Ministry of Environment and Forestry: Gasoline and Diesel Quality Regulation (98/70/EC as amended with 2003/17/EC)] (in Turkish). Resmi Gazete. 11 June 2004. Retrieved 23 April 2022.
  76. ↑ "UAE switches to unleaded fuel". Gulf News. 1 January 2003. Retrieved 28 November 2020.
  77. ↑ "Australia Cuts Sulfur Content in Transport Fuels". Environment News Service. 26 July 2004. Archived from the original on 22 April 2005.
  78. ↑ Lean, Geoffrey (1 January 2006). "UN hails green triumph as leaded petrol is banned throughout Africa". The Independent. Archived from the original on 12 November 2010.
  79. ↑ Chandola, Priyanka (6 January 2015). "Africa adopts continent-wide sustainable transport agenda". Archived from the original on 19 September 2015.
  80. ↑ "Marketing of Super-Leaded Petrol to stop as of 2021". Algeria Press Service. 28 September 2020. Retrieved 24 August 2021.
  81. ↑ "FIA Formula 1 Technical Regulations 2018". 7 December 2017.
  82. ↑ O'Neil, J.; Steele, G.; McNair, C. S.; Matusiak, M. M.; Madlem, J. (2006). "Blood lead levels in NASCAR Nextel Cup Teams". Journal of Occupational and Environmental Hygiene. 3 (2): 67–71. doi:10.1080/15459620500471221. PMID 16361219. S2CID 33119520.
  83. ↑ "NASCAR to Use Unleaded Fuel in 2008". Archived from the original on 28 May 2008. Retrieved 5 January 2020.
  84. ↑ "Issues Related to Lead in Avgas". Aircraft Owners and Pilots Association. 8 March 2016. Archived from the original on 18 September 2011.
  85. ↑ "Modifications / Octane / Lead Content / Fuel Specs / Limitations / Certification". Petersen Aviation Inc. Archived from the original on 30 March 2012.
  86. ↑ Bryan, Chelsea (30 July 2014). "US leads Avgas effort for lead-free air". www.runwaygirlnetwork.com. Kirby Media Group. Retrieved 31 July 2014.
  87. ↑ "Airports' leaden fallout may taint some kids". Science News. 14 July 2022. Retrieved 26 December 2018.
  88. ↑ "Application of fuel additives" (PDF). Archived from the original (PDF) on 5 May 2006.
  89. ↑ "TETRAETHYL LEAD - National Library of Medicine HSDB Database".
  90. 1 2 Stasik, M.; Byczkowska, Z.; Szendzikowski, S.; Fiedorczuk, Z. (December 1969). "Acute tetraethyllead poisoning". Archiv für Toxikologie. 24 (4): 283–291. doi:10.1007/BF00577576. PMID 5795752. S2CID 19189740.
  91. ↑ Le Quesne, P. M. (1981). "Toxic substances and the nervous system: the role of clinical observation". Journal of Neurology, Neurosurgery & Psychiatry. 44 (1): 1–8. doi:10.1136/jnnp.44.1.1. PMC 490811. PMID 7009792.
  92. ↑ "Fact sheet" (PDF). New Jersey: Department of Health. Retrieved 11 November 2019.
  93. ↑ Finkelstein, Yoram (July 1998). "Low-level lead-induced neurotoxicity in children: an update on central nervous system effects". Brain Research Reviews. 27 (2): 168–176. doi:10.1016/S0165-0173(98)00011-3. PMID 9622620. S2CID 15666676.
  94. 1 2 3 Reyes, J. W. (2007). "The Impact of Childhood Lead Exposure on Crime". National Bureau of Economic Research. "a" ref citing Pirkle, Brody, et. al (1994). Retrieved 17 August 2009.
  95. ↑ "Blood Lead Reference Value". Centers for Disease Control and Prevention. 27 October 2021. Retrieved 3 June 2022.
  96. ↑ "Blood Lead Levels in Children". Centers for Disease Control and Prevention. 11 May 2022. Retrieved 3 June 2022.
  97. ↑ Löwig (1853) "Ueber Methplumbäthyl" (On meta-lead ethyl) Annalen der Chemie und Pharmacie, 88 : 318-322.
  98. ↑ George Bowdler Buckton (1859) "Further remarks on the organo-metallic radicals, and observations more particularly directed to the isolation of mercuric, plumbic, and stannic ethyl," Proceedings of the Royal Society of London, 9 : 309–316. For Buckton's preparation of tetraethyl lead, see pages 312–314.
  99. ↑ See, for example:
    • H. E. Roscoe and C. Schorlemmer, A Treatise on Chemistry, Volume 3, Part 1 (New York, New York: D. Appleton and Co., 1890), page 466.
    • Frankland and Lawrence credit Buckton with synthesizing tetraethyl lead in: E. Frankland and Awbrey Lawrance (1879) "On plumbic tetrethide," Journal of the Chemical Society, Transactions, 35 : 244-249.
  100. ↑ "Leaded Gasoline, Safe Refrigeration, and Thomas Midgley, Jr." Chapter 6 in S. Bertsch McGrayne. Prometheans in the Lab. McGraw-Hill: New York, 2002. ISBN 0-07-140795-2
  101. ↑ zk4540. "Innovation Starts Here – DuPont USA".{{cite web}}: CS1 maint: numeric names: authors list (link)
  102. ↑ Blum, Deborah (5 January 2013). "Looney Gas and Lead Poisoning: A Short, Sad History". Wired – via www.wired.com.
  103. ↑ Harford, Tim (28 August 2017). "Why did we use leaded petrol for so long?". BBC News. Retrieved 3 September 2017.
  104. ↑ "Tetraethyl lead (Bruce Hamilton)". yarchive.net.
  105. ↑ Alan P. Loeb, "Paradigms Lost: A Case Study Analysis of Models of Corporate Responsibility for the Environment," Business and Economic History, Vol. 28, No. 2, Winter 1999, at 95.
  106. ↑ Silbergeld, Ellen (February 1995). "Annotation: Protection of the Public Interest, Allegations of Scientific Misconduct, and the Needleman Case". American Journal of Public Health. 85 (2): 165–166. doi:10.2105/AJPH.85.2.165. PMC 1615323. PMID 7856774.
  107. ↑ Bryson, Christopher (2004). The Fluoride Deception, p. 41. Seven Stories Press. Citing historian Lynne Snyder.
  108. ↑ Bryson, B. (2003). "10. Getting the Lead Out". A Short History of Nearly Everything. New York: Broadway Books. ISBN 978-0-7679-0818-4.
  109. ↑ The Most Important Scientist You’ve Never Heard Of, BY Lucas Reilly, May 17, 2017, mentalfloss.com.
  110. ↑ Needleman, H. (2000). "The Removal of Lead from Gasoline: Historical and Personal Reflections". Environmental Research. 84 (1): 20–35. Bibcode:2000ER.....84...20N. doi:10.1006/enrs.2000.4069. PMID 10991779.
  111. ↑ "Gasoline and the environment - leaded gasoline - U.S. Energy Information Administration (EIA)". www.eia.gov. Retrieved 23 June 2023.
  112. ↑ "Lead Credit Trading". National Center for Environmental Economics. US EPA. c. 2006. Retrieved 3 October 2014.
  113. ↑ Pirkle, J.L.; Brody, D.J.; Gunter, E.W.; et al. (1994). "The Decline in Blood Lead Levels in the United States: The National Health and Nutrition Examination Surveys (NHANES)". JAMA. 272 (4): 284–291. doi:10.1001/jama.1994.03520040046039. PMID 8028141.
  114. ↑ Pirisi, Angela (9 April 2005). "Profile Philip Landrigan: children's health crusader" (PDF). The Lancet. 365 (9467): 1301. doi:10.1016/S0140-6736(05)61015-X. PMID 15823369. S2CID 35297688.
  115. ↑ Gilbert, Andrew (19 July 2011). "Derek Bryce-Smith obituary". the Guardian.
  116. ↑ "EPA Takes Final Step in Phaseout of Leaded Gasoline". US EPA Archive. US EPA. 29 January 1996. Retrieved 5 January 2020. Effective 1 January 1996, the Clean Air Act banned the sale of the small amount of leaded fuel that was still available in some parts of the country for use in on-road vehicles. EPA said fuel containing lead may continue to be sold for off-road uses, including aircraft, racing cars, farm equipment, and marine engines.
  117. ↑ Schnaas, Lourdes; Rothenberg, Stephen J.; Flores, María-Fernanda; Martínez, Sandra; Hernández, Carmen; Osorio, Erica; Perroni, Estela (2004). "Blood Lead Secular Trend in a Cohort of Children in Mexico City (1987–2002)". Environ. Health Perspect. 112 (10): 1110–1115. doi:10.1289/ehp.6636. PMC 1247386. PMID 15238286.
  118. ↑ Paulina Pino; Tomás Walter; Manuel J. Oyarzún; Matthew J. Burden; Betsy Lozoff (2004). "Rapid Drop in Infant Blood Lead Levels during the Transition to Unleaded Gasoline Use in Santiago, Chile". Archives of Environmental Health. 59 (4): 182–187. doi:10.3200/AEOH.59.4.182-187. PMID 16189990. S2CID 25089958.
  119. ↑ Franchi, Valerie (October 1997). "Getting the Lead Out" (PDF). Front Lines. Washington, DC: USAID. Archived from the original (PDF) on 4 March 2017. Retrieved 13 January 2024.
  120. ↑ "The Case for Banning Lead in Gasoline" (PDF). Manufacturers of Emission Controls Association (MECA). January 2003. Archived from the original (PDF) on 26 April 2012. Retrieved 7 June 2012.
  121. ↑ Tsai, P.L.; Hatfield, T.H. (December 2011). "Global Benefits From the Phaseout of Leaded Fuel" (PDF). Journal of Environmental Health. 74 (5): 8–14. Archived from the original (PDF) on 23 December 2016. Retrieved 28 May 2014.
  122. ↑ "Highly polluting leaded petrol now eradicated from the world, says UN". BBC News. 31 August 2021.
  123. ↑ "Era of leaded petrol over, eliminating a major threat to human and planetary health". United Nations Environment Programme. 30 August 2021. Retrieved 31 August 2021.
  124. ↑ Matthews, Dylan (22 April 2013). "Lead abatement, alcohol taxes and 10 other ways to reduce the crime rate without annoying the NRA". The Washington Post. Retrieved 23 May 2013.
  125. ↑ Lean, Geoffrey (27 October 2007). "Ban on leaded petrol 'has cut crime rates around the world'". The Independent.
  126. ↑ Hawthorne, Michael (6 June 2015). "Lead poisoning linked to violent crime". Chicago Tribune.
  127. ↑ Wolpaw Reyes, Jessica (May 2007). "Environmental Policy as Social Policy? The Impact of Childhood Lead Exposure on Crime" (PDF). National Bureau of Economic Research. Retrieved 23 May 2013.
  128. ↑ Drum, Kevin (January–February 2013). "America's Real Criminal Element: Lead". Mother Jones. Retrieved 4 January 2013.
  129. ↑ "Lead's Urban Legacy". Tulane University. 2013. Retrieved 19 November 2019. Children and adults inadvertently touch, breath and eat lead-soil from inside and outside sources. Its accessability [sic] makes it a bigger lead-health threat than leaded paint ...

Further reading

  • Filella, Montserrat; Bonet, Josep (2017). "Chapter 14. Environmental Impact of Alkyl Lead(IV) Derivatives: Perspective after Their Phase-out". In Astrid, S.; Helmut, S.; Sigel, R. K. O. (eds.). Lead: Its Effects on Environment and Health. Metal Ions in Life Sciences. Vol. 17. de Gruyter. pp. 471–490. doi:10.1515/9783110434330-014. ISBN 978-3-11-043433-0. PMID 28731307.

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