Helena Joyce
Persistent organic pollutants (POPs) are toxic chemicals that are resistant to degradation and bioaccumulate in the environment. POPs are primarily products and by-products of industrial processes, chemical manufacturing, and waste disposal. They are toxic and adversely affect human health and the environment. They can be transported by wind and water, meaning they can affect people and wildlife far from where they are released. The Stockholm Convention of 2001 identified 12 POPs, commonly referred to as the Dirty Dozen, which are targeted for elimination or severe restriction. These 12 POPs include pesticides such as aldrin, chlordane, DDT, dieldrin, endrin, heptachlor, mirex, and toxaphene, as well as industrial chemicals like hexachlorobenzene and polychlorinated biphenyls (PCBs). These chemicals have been linked to a range of health issues, including endocrine disruption, reproductive disorders, neurobehavioural impairment, and increased cancer risk.
| Characteristics | Values |
|---|---|
| Number identified by the Stockholm Convention | 33 |
| Number considered highly persistent and toxic | 12 |
| Names | Aldrin, Chlordane, DDT, Dieldrin, Endrin, Heptachlor, Hexachlorobenzene, Mirex, Polychlorinated biphenyls (PCBs), Polychlorinated dibenzo-p-dioxins, Polychlorinated dibenzofurans, Toxaphene |
| Toxic effects | Endocrine disruption, reproductive problems, cancer, cardiovascular disease, obesity, diabetes, nervous system damage, diseases of the immune system, developmental disorders |
| Persistence | Resistant to degradation through chemical, biological, and photolytic processes |
| Bioaccumulation | High lipid solubility, accumulate in fatty tissues of living organisms, including human tissues for long periods |
| Transportability | Can be transported by wind and water, affecting people and wildlife far from their release |
| Action | Stockholm Convention aims to phase out and eliminate production and use of these chemicals |
| Additional substances added to the list | Carcinogenic polycyclic aromatic hydrocarbons (PAHs), brominated flame retardants, organometallic compounds like tributyltin (TBT) |
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What You'll Learn
- Aldrin, chlordane, DDT, dieldrin, endrin, heptachlor, mirex, toxaphene are pesticides that are POPs
- PCBs and hexachlorobenzene are industrial chemical POPs
- Dioxins and furans are by-products of chlorine and chlorine-containing materials
- POPs are toxic, persistent, bioaccumulative, endocrine disruptors and travel long distances
- The Stockholm Convention aims to eliminate or restrict the production and use of POPs
Aldrin, chlordane, DDT, dieldrin, endrin, heptachlor, mirex, toxaphene are pesticides that are POPs
Aldrin, chlordane, DDT, dieldrin, endrin, heptachlor, mirex, and toxaphene are pesticides that are classified as persistent organic pollutants (POPs). These chemicals are known for their persistence in the environment and their ability to accumulate in the body fat of humans and other animals. They are toxic and can cause nervous system damage, diseases of the immune system, reproductive and developmental disorders, endocrine disruption, genotoxicity, and cancers.
Aldrin is a pesticide applied to soils to kill termites, grasshoppers, corn rootworms, and other insect pests. It is also toxic to birds, fish, and humans. In one incident, aldrin-treated rice was believed to have killed hundreds of birds along the Texas Gulf Coast. Humans are mostly exposed to aldrin through dairy products and animal meats.
Chlordane is a broad-spectrum insecticide used on a range of agricultural crops to control termites. It has a long half-life and remains in the soil for a long time. Chlordane is toxic to fish and birds, and it may affect the human immune system. It has been detected in indoor air in residences in the US and Japan.
DDT (dichlorodiphenyltrichloroethane) is an organochlorine pesticide that has been used to control malaria and typhus. It is one of the most widely used pesticides in developing countries in Asia. DDT residues have been found in human breast milk in various places around the world, including Croatia and Korea.
Dieldrin is a byproduct of aldrin and is highly toxic to fish and other aquatic animals. It has been found in air, water, soil, fish, birds, mammals, and food sources such as pasteurized milk. Food is the primary source of exposure for the general population.
Endrin is another pesticide that does not accumulate in animal fatty tissue to the same extent as structurally similar chemicals. However, it has a long half-life, persisting in the soil for up to 12 years. It is highly toxic to fish, causing early hatching and death in sheepshead minnows exposed to high levels.
Heptachlor is an organochlorine pesticide used to kill soil insects, termites, cotton insects, grasshoppers, crop pests, and mosquitoes. It has been reported to induce mitochondria-mediated cell death, potentially associating it with neurological disorders such as Parkinson's disease.
Mirex is a stable and persistent pesticide with a half-life of up to 10 years. It is toxic to plant species, fish, and crustaceans. Food, especially meat, fish, and wild game, is the main route of human exposure to mirex.
Toxaphene was the most widely used pesticide in the US in 1975. It can persist in the soil for up to 12 years, and it is highly toxic to fish. While direct exposure to toxaphene is not highly toxic to humans, it has been listed as a possible human carcinogen due to its effects on laboratory animals.
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PCBs and hexachlorobenzene are industrial chemical POPs
Polychlorinated biphenyls (PCBs) are organochlorine compounds with the formula C12H10−xClx. They are toxic, man-made, hazardous organic chemicals that have dangerous effects on the environment and human health. PCBs persist in the environment for long periods and can travel over great distances through air, water, and migratory species across international boundaries. They accumulate in fatty tissues and bio-magnify higher up in the food chain, where they can be harmful to top predators such as tuna, seals, polar bears, and humans.
PCBs were domestically manufactured from 1929 until their ban in 1979. They were used in hundreds of industrial and commercial applications due to their non-flammability, chemical stability, high boiling point, and electrical insulating properties. Some of these applications include carbonless copy paper, heat transfer fluids, and dielectric and coolant fluids for electrical equipment.
PCBs are classified as persistent organic pollutants (POPs) and their production was banned for most uses by United States federal law on January 1, 1978, and internationally by the Stockholm Convention on Persistent Organic Pollutants in 2001. The Stockholm Convention, which has been ratified by 185 countries, obliges parties to eliminate the use of PCBs in equipment by 2025 and properly manage waste liquids and equipment contaminated with PCBs by 2028.
Hexachlorobenzene is another POP that is classified as an industrial chemical. It is one of the eight pesticides that are among the 12 POPs targeted by the Stockholm Convention.
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Dioxins and furans are by-products of chlorine and chlorine-containing materials
Dioxins and furans are two chemical families of unintended by-products of the manufacture, use, and/or combustion of chlorine and chlorine-containing materials. They are chemically classified as halogenated aromatic hydrocarbons. Dioxins are formed during the combustion of automotive fuel, chlorination of waste, and in drinking water treatment plants. They may also result from natural processes, such as volcanic eruptions and forest fires.
Dioxins are highly toxic and can cause reproductive and developmental problems, damage the immune system, interfere with hormones, and cause cancer. They are virtually insoluble in water but have a relatively high solubility in lipids, which is why they tend to associate with organic matter such as plankton, plant leaves, and animal fat. They are also found in dairy products, meat, fish, and shellfish. Dioxins are extremely stable and can persist in the environment and in the human body for a long time. Their half-life in the human body is estimated to be 7 to 11 years.
Furans are derivatives of dibenzofuran. There are 135 isomers, and 10 have dioxin-like properties. They are formed whenever organics, oxygen, and chlorine are available at suitable temperatures, which is augmented by metal catalysts such as copper. The optimal temperature range is 400 °C (752 °F) to 700 °C (1,292 °F). This means that their formation is highest when organic material is burned in less-than-optimal conditions, such as open fires, building fires, domestic fireplaces, and poorly operated and/or designed solid waste incinerators.
Both dioxins and furans are ubiquitous and can be found in a wide range of environments and organisms, although usually in very small quantities. They can enter the human body through breathing, ingestion, or absorption through the skin. They may also be present in food substances due to contamination in the food chain. Disturbance of soil sediments, organic matter, and waste disposal sites may also re-release the dioxins and furans.
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POPs are toxic, persistent, bioaccumulative, endocrine disruptors and travel long distances
Persistent Organic Pollutants (POPs) are toxic chemicals that adversely affect human health and the environment. They are resistant to degradation and persist in the environment for long periods, leading to bioaccumulation and biomagnification in the food chain. POPs are toxic, persistent, bioaccumulative, endocrine disruptors, and can travel long distances.
POPs are toxic even in small quantities and can cause nervous system damage, immune system diseases, reproductive and developmental disorders, and cancers. Their toxicity is linked to their ability to interfere with the body's hormones, particularly during prenatal life, altering development and affecting the ability to learn, fight disease, and reproduce.
The persistence of POPs is due to their resistance to normal processes that break down contaminants. They have long half-lives, ranging from 4 to 15 years, and can remain in the soil for up to 12 years. Their persistence leads to bioaccumulation, as they accumulate in the body fat of people, marine mammals, and other animals, and are passed from mother to fetus.
Endocrine-disrupting chemicals (EDCs) are compounds that either mimic or block endogenous hormones, disrupting normal hormone homeostasis. POPs, including PCBs, have been linked to endocrine disruption, with studies showing their toxic effects on the liver and thyroid, increased childhood obesity in prenatal exposure, and potential links to diabetes.
POPs can travel long distances via wind and water currents, and their transport properties allow them to cross national boundaries. They have been found in virtually all regions of the world and may concentrate near the North Pole due to weather patterns and cold conditions. This long-range transport contributes to their widespread distribution and presence in food, soil, air, and water.
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The Stockholm Convention aims to eliminate or restrict the production and use of POPs
The Stockholm Convention, also known as the Stockholm Convention on Persistent Organic Pollutants, is an international environmental treaty that was signed on 22 May 2001 in Stockholm, Sweden, and came into effect on 17 May 2004. The convention is managed by the United Nations Environment Program, and its key objective is to protect human health and the environment from the harmful effects of Persistent Organic Pollutants (POPs).
POPs are toxic chemical substances that persist in the environment for long periods, resisting normal processes that break down contaminants. They accumulate in the body fat of humans, marine mammals, and other animals and are passed from mother to fetus. POPs can also travel great distances via wind and water currents, contaminating the soil, air, water, and food. Human exposure to even low levels of POPs can lead to serious health issues, including increased cancer risk, reproductive and developmental disorders, neurobehavioural impairment, endocrine disruption, genotoxicity, and increased birth defects.
The Stockholm Convention outlines specific actions to be taken by signatory nations to eliminate or restrict the production, use, and release of POPs. It targets the 12 most persistent and bioaccumulative POPs, including eight pesticides (aldrin, chlordane, DDT, dieldrin, endrin, heptachlor, mirex, and toxaphene), two types of industrial chemicals (polychlorinated biphenyls (PCBs) and hexachlorobenzene), and two chemical families of unintended by-products of chlorine and chlorine-containing materials (dioxins and furans).
Signatory countries are required to adopt control measures to reduce and eliminate the release of POPs. For intentionally produced POPs, nations must prohibit or restrict their production, use, and import, subject to certain exemptions. For unintentionally produced POPs, countries are expected to develop national action plans to address releases and apply the best available technologies to manage and dispose of POPs wastes in an environmentally sustainable manner.
The Stockholm Convention also includes provisions for identifying additional POPs and has played a significant role in controlling harmful chemicals on both a national and global level.
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Frequently asked questions
POPs are organic compounds that are resistant to degradation through chemical, biological, and photolytic processes. They are toxic and adversely affect human health and the environment.
The 12 POPs, also known as the "Dirty Dozen", are:
- Aldrin
- Chlordane
- Dieldrin
- Endrin
- Heptachlor
- HCB (Hexachlorobenzene)
- Mirex
- Toxaphene
- PCBs (Polychlorinated biphenyls)
- DDT (Dichlorodiphenyltrichloroethane)
- Dioxins
- Polyc
POPs are primarily products and by-products from industrial processes, chemical manufacturing, and resulting wastes. They are also used in pest and disease control, crop production, and pharmaceuticals.
POPs are toxic and can cause nervous system damage, diseases of the immune system, reproductive and developmental disorders, endocrine disruption, and cancers. They can also be passed from mother to fetus. In the environment, POPs can accumulate in organisms through the food chain, particularly in those higher up the food chain like whales.
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