Pesticide residue

Pesticide residue refers to the pesticides that may remain on or in food, after they are applied to food crops.[1] The maximum allowable levels of these residues in foods are stipulated by regulatory bodies in many countries. Regulations such as pre-harvest intervals also prevent harvest of crop or livestock products if recently treated in order to allow residue concentrations to decrease over time to safe levels before harvest.[2]

Definition

A pesticide is a substance or a mixture of substances used for killing pests: organisms dangerous to cultivated plants or to animals. The term applies to various pesticides such as insecticide, fungicide, herbicide and nematocide.[3]

The definition of residue of pesticide according to the world health organisation (WHO) is:- Any specified substances in or on food, agricultural commodities or animal feed resulting from the use of a pesticide. The term includes any derivatives of a pesticide, such as conversion products, metabolites, reaction products and impurities considered to be of toxicological significance. The term “pesticide residue” includes residues from unknown or unavoidable sources (e.g. environmental) as well as known uses of the chemical. The definition of a residue for compliance with maximum residue limits (MRLs) is that combination of the pesticide and its metabolites, derivatives and related compounds to which the MRL applies.[4]

Background

Prior to 1940, pesticides consisted of inorganic compounds (copper, arsenic, mercury, and lead) and plant derived products. Most of these were abandoned because they were highly toxic and ineffective. Since World War II pesticides composed of synthetic organic compounds were the most important form of pest control. The growth in these pesticides accelerated in late 1940s after Paul Müller discovered DDT in 1939. The effects of pesticides such as aldrin, dieldrin, endrin, chlordane, parathion, captan and 2,4-D were also found at this time.[5][6] Those pesticides were widely used due to their effective pest control. Problems with environmental issues of DDT became increasingly apparent, since it is persistent and bioaccumulates in the body and the food chain.[5] In the 1960s, Rachel Carson wrote Silent Spring to illustrate a risk of DDT and how it threatened biodiversity.[7] DDT was banned for agricultural use in 1972 and the others in 2001. Persistent pesticides are no longer used for agriculture, and will not be approved by the authorities.[8][9] Because the half life in soil is long (for DDT 2–15 years[10]) residues can still be detected in humans at levels 5 to 10 times lower than found in the 1970s.[11]

Regulations

Each country adopts their own agricultural policies and Maximum Residue Limits (MRL) and Acceptable Daily Intake (ADI). The level of food additive usage varies by country because forms of agriculture are different in regions according to their geographical or climatical factors.[citation needed]

Pre-harvest intervals are also set to require a crop or livestock product not be harvested before a certain period after application in order to allow the pesticide residue to decrease below maximum residue limits or other tolerance levels.[12] Likewise, restricted entry intervals are the amount of time to allow residue concentrations to decrease before a worker can reenter without protective equipment an area where pesticides have been applied.[13]

International

Some countries use the International Maximum Residue Limits -Codex Alimentarius to define the residue limits; this was established by Food and Agriculture Organization of the United Nations (FAO) and World Health Organization (WHO) in 1963 to develop international food standards, guidelines codes of practices, and recommendation for food safety. Currently the CODEX has 185 Member Countries and 1 member organization (EU).[14]

The following is the list of maximum residue limits (MRLs) for spices adopted by the commission.[15]

Pesticide Group or sub-group of spices MRL (mg/kg)
Acephate Entire Group 028 0.2
Azinphos-methyl Entire Group 028 0.5
Chlorpyrifos Seeds
Fruits or berries
Roots or rhizomes
5
1
1
Chlorpyrifos-methyl Seeds
Fruits or berries
Roots or rhizomes
1
0.3
5
Cypermethrin Fruits or berries
Roots or rhizomes
0.1
0.2
Diazinon Seeds
Fruits
Roots or rhizomes
5
0.1
0.5
Dichlorvos Entire Group 028 0.1
Dicofol Seeds
Fruits or berries
Roots or rhizomes
0.05
0.1
0.1
Dimethoate Seeds
Fruits or berries
Roots or rhizomes
5
0.5
0.1
Disulfoton Entire Group 028 0.05
Endosulfan Seeds
Fruits or berries
Roots or rhizomes
1
5
0.5
Ethion Seeds
Fruits or berries
Roots or rhizomes
3
5
0.3
Fenitrothion Seeds
Fruits or berries
Roots or rhizomes
7
1
0.1
Iprodione Seeds
Fruits or berries
Roots or rhizomes
7
1
0.1
Malathion Seeds
Fruits or berries
Roots or rhizomes
2
1
0.5
Metalaxyl Seeds 5
Methamidophos Entire Group 028 0.1
Parathion Seeds
Fruits or berries
Roots or rhizomes
0.1
0.2
0.2
Parathion-methyl Seeds
Fruits or berries
Roots or rhizomes
5
5
0.3
Permethrin Entire Group 028 0.05
Phenthoate Seeds 7
Phorate Seeds
Fruits or berries
Roots or rhizomes
0.5
0.1
0.1
Phosalone Seeds
Fruits or berries
Roots or rhizomes
2
2
3
Pirimicarb Seeds 5
Pirimiphos-methyl Seeds sub group
Fruits sub group
3
0.5
Quintozene Seeds sub group
Fruits or berries
Roots or rhizomes
0.1
0.02
2
Vinclozolin Entire spice group 0.05

European Union

The European Union has a searchable database with the Maximum Residue Limits (MRLs) for 716 pesticides. Under the previous system, revised in 2008, certain pesticide residues were regulated by the commission; others were regulated by Member States, and others were not regulated at all.[16]

New Zealand

Food Standards Australia New Zealand develops the standards for levels of pesticide residues in foods through a consultation process. The New Zealand Food Safety Authority publishes the maximum limits of pesticide residues for foods produced in New Zealand.[17]

United Kingdom

Monitoring of pesticide residues in the UK began in the 1950s. From 1977 to 2000 the work was carried out by the Working Party on Pesticide Residues (WPPR), until in 2000 the work was taken over by the Pesticide Residue Committee (PRC). The PRC advise the government through the Pesticides Safety Directorate and the Food Standards Agency (FSA).[18]

United States

In the US, tolerances for the amount of pesticide residue that may remain on food are set by the EPA, and measures are taken to keep pesticide residues below the tolerances. The US EPA has a web page for the allowable tolerances.[19] In order to assess the risks associated with pesticides on human health, the EPA analyzed individual pesticide active ingredients as well as the common toxic effect that groups of pesticides have, called the cumulative risk assessment. Limits that the EPA sets on pesticides before approving them includes a determination of how often the pesticide should be used and how it should be used, in order to protect the public and the environment.[20] In the US, the Food and Drug Administration (FDA) and USDA also routinely check food for the actual levels of pesticide residues.[21]

A US organic food advocacy group, the Environmental Working Group, is known for creating a list of fruits and vegetables referred to as the Dirty Dozen; it lists produce with the highest number of distinct pesticide residues or most samples with residue detected in USDA data. This list is generally considered misleading and lacks scientific credibility because it lists detections without accounting for the risk of the usually small amount of each residue with respect to consumer health.[22][23][24] In 2016, over 99% of samples of US produce had no pesticide residue or had residue levels well below the EPA tolerance levels for each pesticide.[21]

Japan

In Japan, pesticide residues are regulated by the Food Safety Act.

Pesticide tolerances are set by the Ministry of Health, Labour and Welfare through the Drug and Food Safety Committee. Unlisted residue amounts are restricted to 0.01ppm.[25]

China

In China, the Ministry of Health and the Ministry of Agriculture have jointly established mechanisms and working procedures relating to maximum residue limit standards, while updating them continuously, according to the food safety law and regulations issued by the State Council.[26][27] From GB25193-2010[28] to GB28260-2011,[29] from Maximum Residue Limits for 12 Pesticides to 85 pesticides, they have improved the standards in response to Chinese national needs.

Health impacts

Accidental or inadvertent poisoning of agricultural workers due to exposure to pesticides is a very serious matter resulting in many deaths and hospitalizations. The effects of pesticides at high concentrations on human health is a thus a matter of much study, resulting in many publications on the toxicology of pesticides. However the maximum residue limits of pesticides in food are low, and are carefully set by the authorities to ensure, to their best judgement, no health impacts.

According to the American Cancer Society there is no evidence that pesticide residues increase the risk of people getting cancer.[30] The ACA advises washing fruit and vegetables before eating to remove both pesticide residue and other undesirable contaminants.[30]

There are many studies on the health differences between consumers of organic foods vs consumers of organically grown foods. When the American Academy of Pediatrics reviewed the literature on organic foods in 2012, they found that "current evidence does not support any meaningful nutritional benefits or deficits from eating organic compared with conventionally grown foods, and there are no well-powered human studies that directly demonstrate health benefits or disease protection as a result of consuming an organic diet."[31]

Chinese incidents

In China, a number of incidents have occurred where state limits were exceeded by large amounts or where the wrong pesticide was used. In August 1994, a serious incident of pesticide poisoning of sweet potato crops occurred in Shandong province, China. Because local farmers were not fully educated in the use of insecticides, they used the highly-toxic pesticide named parathion instead of trichlorphon. It resulted in over 300 cases of poisoning and 3 deaths. Also, there was a case where a large number of students were poisoned and 23 of them were hospitalized because of vegetables that contained excessive pesticide residues.[32]

Child neurodevelopment

Many pesticides achieve their intended use of killing pests by disrupting the nervous system. Due to similarities in brain biochemistry among many different organisms, there is much speculation that these chemicals can have a negative impact on humans as well.[33] Children are especially vulnerable to exposure to pesticides, especially at critical windows of development. Infants and children consume higher amounts of food relative to their body-weight, and have a more permeable blood–brain barrier, all of which can contribute to increased risks from exposure to pesticide residues.[34] However, in 2008 the OECD report that the existing guideline represents the best available science for assessing the potential for developmental neurotoxicity in human health risk assessment.[35]

See also

References

  1. ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "pesticide residue". doi:10.1351/goldbook.P04520
  2. ^ "Pesticide Residue". Environmental Protection Agency. Archived from the original on 4 June 2013. Retrieved 9 November 2011.
  3. ^ US Environmental (24 July 2007), What is a pesticide? epa.gov. Retrieved on 24 October 2012.
  4. ^ Sheffer, Marla (2009). "Principles and Methods for the Risk Assessment of Chemicals in Food" (PDF). International programme on chemical safety. Retrieved 8 January 2024.
  5. ^ a b Pesticide Usage in the United States: History, Benefits, Risks, and Trends; Bulletin 1121, November 2000, K.S. Delaplane, Cooperative Extension Service, The University of Georgia College of Agricultural and Environmental Sciences "Archived copy" (PDF). Archived from the original (PDF) on 13 June 2010. Retrieved 10 November 2012.{{cite web}}: CS1 maint: archived copy as title (link)
  6. ^ "A history of pesticide use", Patricia Muir at Oregon State University. Last updated 22 October 2012.
  7. ^ Lobe, J (16 September 2006), "WHO urges DDT for malaria control Strategies," Inter Press Service, cited from Commondreams.org. Retrieved on 15 September 2007
  8. ^ "About Pesticide Registration". EPA (environmental protection agency). 4 January 2024. Retrieved 6 January 2024.
  9. ^ "Approval of pesticides and herbicides in the EU". European Commission. Retrieved 6 January 2024.
  10. ^ "National Biomonitoring Program". Center for disease control and prevention. 7 April 2017. Retrieved 6 January 2024.
  11. ^ "Dichlorodiphenyltrichloroethane (DDT) Factsheet". Center for disease control and prevention. 16 August 2021. Retrieved 6 January 2024.
  12. ^ "Preharvest Interval". npic.orst.edu. National Pesticide Information Center. Retrieved 30 March 2018.
  13. ^ "Pesticides - Re-entry Interval : OSH Answers". www.ccohs.ca. Government of Canada, Canadian Centre for Occupational Health and Safety. 15 November 2018. Retrieved 30 March 2018.
  14. ^ CODEX International Food Standards (23 October 2012) Retrieved on October 28, 2012
  15. ^ CODEX International Food Standards, Maximum Residue Limits for Spices (23 October 2012)[permanent dead link] Retrieved on 28 October 2012
  16. ^ "Maximum Residue Levels". European commission. Retrieved 16 January 2024.
  17. ^ "Food Standards". New Zealand Food Safety Authority. Retrieved 20 February 2009.
  18. ^ CRD. "CRD | About PRiF | The Role of the PRiF". Pesticides.gov.uk. Retrieved 30 May 2013.
  19. ^ "Protection of Environment". Access.gpo.gov. 1 July 2004. Archived from the original on 4 February 2012. Retrieved 30 May 2013.
  20. ^ "Pesticides: Health and Safety". 17 October 2014. Archived from the original on 10 February 2003. Retrieved 8 February 2015.
  21. ^ a b "Pesticide Data Program". U.S. Department of Agriculture (USDA). Retrieved 6 January 2024.
  22. ^ Winter, Carl K.; Katz, Josh M. (2011). "Dietary Exposure to Pesticide Residues from Commodities Alleged to Contain the Highest Contamination Levels". Journal of Toxicology. 2011: 589674. doi:10.1155/2011/589674. PMC 3135239. PMID 21776262.
  23. ^ Gribble, Gordon W. (3 March 2013). "Food chemistry and chemophobia". Food Security. 5 (2): 177–187. doi:10.1007/s12571-013-0251-2. S2CID 18802337.
  24. ^ "How Organic Produce Can Make America Less Healthy". Bloomberg.com. 9 March 2017. Retrieved 20 May 2018.
  25. ^ "The Japanese Positive List System for Agricultural Chemical Residues in Foods" (Press release). The Japan Food Chemical Research Foundation. May 2006.
  26. ^ "Ministry of Health and Ministry of Agriculture Released MRL Standards". China Pesticide Information Network. Press Office of the Ministry of Agriculture. Archived from the original on 27 February 2015. Retrieved 16 November 2012.
  27. ^ "China released 85 kinds of food pesticide maximum residue limits". World agricultural network Chinese network. Retrieved 16 November 2012.
  28. ^ "Maximum Residue Limits for 12 Pesticides" (in Chinese). Archived from the original on 14 December 2012. Retrieved 16 November 2012.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
  29. ^ "Maximum Residue Limits for 85 Pesticides". Archived from the original on 14 December 2012. Retrieved 16 November 2012.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
  30. ^ a b "ACS Guidelines on Nutrition and Physical Activity for Cancer Prevention – Common questions about diet and cancer". American Cancer Society. 9 April 2015. Retrieved 12 December 2015.[permanent dead link]
  31. ^ Forman, Joel; Silverstein, Janet; Committee on Nutrition; Council on Environmental Health; American Academy of Pediatrics (November 2012). "Organic foods: health and environmental advantages and disadvantages". Pediatrics. 130 (5): e1406–1415. doi:10.1542/peds.2012-2579. ISSN 1098-4275. PMID 23090335.
  32. ^ "Environmental Pesticide Pollution and Its Countermeasures in China" Xu Hui, Qian Yi, Peng Bu-zhuo, Jiang Xiliu and Hua Xiao-mei Ambio Vol. 32, No. 1 (February 2003), pp. 78-80 Published by: Springer
  33. ^ Marina Bjørling-Poulsen; Helle Raun Andersen; Philippe Grandjean. (2008). "Potential developmental neurotoxicity of pesticides used in Europe". Environmental Health. 7 (1): 50. Bibcode:2008EnvHe...7...50B. doi:10.1186/1476-069X-7-50. PMC 2577708. PMID 18945337.
  34. ^ Bernard Weiss; Sherlita Amler; Robert W. Amler. (2004). "Pesticides". Pediatrics. 113 (4 Suppl): 1030–6. doi:10.1542/peds.113.S3.1030. PMID 15060196. S2CID 245062674.
  35. ^ Makris, Susan L. (2009). "A Retrospective Performance Assessment of the Developmental Neurotoxicity Study in Support of OECD Test Guideline 426". Environmental Health Perspectives. 117 (1): 17–25. doi:10.1289/ehp.11447. PMC 2627860. PMID 19165382 – via EHP publishing.

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