Mendrin, Compound 269, (1aR,2S,2aS,3S,6R,6aR,7R,7aS)-3,4,5,6,9,9-hexachloro-1a,2,2a,3,6,6a,7,7a-octahydro-2,7:3,6-dimethanonaphtho[2,3-b]oxirene, 1,2,3,4,10,10-Hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo,endo-5,8-dimethanonaphthalene
|Molar mass||380.907 g/mol|
|Appearance||Colorless to tan crystalline solid|
|Density||1.77 g/cm3 |
|Melting point||200 °C (392 °F; 473 K) (decomposes)|
|Vapor pressure||2.6 x 10-5 Pa|
|Flash point||noncombustible |
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
3 mg/kg (oral, monkey)
16 mg/kg (oral, guinea pig)
10 mg/kg (oral, hamster)
3 mg/kg (oral, rat)
7 mg/kg (oral, rabbit)
1.4 mg/kg (oral, mouse)
LDLo (Lowest published)
|5 mg/kg (cat, oral)|
|US health exposure limits (NIOSH):|
|TWA 0.1 mg/m3 [skin]|
|TWA 0.1 mg/m3 [skin]|
IDLH (Immediate danger
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|(: / ?)|
Endrin is an
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- "Basic Information about Endrin in Drinking Water". United States Environmental Protection Agency. February 9, 2014. Retrieved March 2015.
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- "Integrated Management Techniques to Control Nonnative Fishes" (PDF). Upper Midwest Environmental Sciences Center. United States Geological Survey. December 2003. Retrieved March 2015.
- Blus, L.J.; Henny, C.J.; Grove, R.A. (January 1989). "Rise and fall of endrin usage in Washington State fruit orchards: Effects on wildlife". Environmental Pollution 60 (3-4): 331–349.
- "Healthy Milk, Healthy Baby - Chemical Pollution and a Mother's Milk". National Resources Defense Council. 25 March 2005. Retrieved March 2015.
- "Ambient Water Quality Criteria for Endrin" (PDF). EPA Water. United States Environmental Protection Agency. October 1980. Retrieved March 2015.
- "International Notes Acute Convulsions Associated with Endrin Poisoning -- Pakistan". Morbidity and Mortality Weekly Report (MMWR). Center for Disease Control. 14 December 1984. Retrieved March 2015.
- Jabbar, Abdul (October 1992). "PESTICIDE POISONING IN HUMANS" (PDF). Journal of Pakistan Medical Association. Retrieved March 2015.
- Matsumoto, Emiko; Kawanaka, Youhei; Yun, Sun-Ja; Oyaizu, Hiroshi (4 July 2009). "Bioremediation of the organochlorine pesticides, dieldrin and endrin, and their occurrence in the environment". Applied Microbiology and Biotechnology 84 (2): 205–216.
- Zitko, Vladimir (2003). Persistent Organic Pollutants (PDF). Berlin Heidelberg: Springer-Verlag. pp. 47–90.
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Taiwan is not a party to the Executive Yuan on April 2008. The Central Competent Authorities of Taiwan sets the limit of 20 mg/kg for soil pollution control. For marine environment quality, standards of 0.002 mg/L has been set. For occupational exposures to endrin, warning has been given that the contact with skin, eyes, and mucous membranes can contribute to the overall exposure.
The WHO lists Endrin as an obsolete pesticide in its 'Classification of Pesticides by Hazard' and did not assign any hazard class per the Globally Harmonized System of Classification and Labelling of Chemicals.
.3 at 0.1 mg/mexposure limits have set NIOSH and OSHA For occupational exposures to endrin,  has been advised against due to the zero tolerance of endrin levels in food products.fisheries Use of endrin in ) is set to 2 ppb.maximum contaminant level The drinking water limit ( In the United States, endrin has been regulated by the
Hazardous Substances Data Bank (HSDB) lists reductive dechlorination and incineration for field disposal of small quantities of endrin. In reductive dechlorination, endrin's chlorine atoms were completely replaced with hydrogen atoms, which is suspected to be more environmentally acceptable. Even though endrin binds very strongly to soil, phytoremediation has been proposed by group of Japanese scientists using crops in the Cucurbitaceae family. As of 2009, exact mechanisms behind the plant uptake of endrin have not been understood. Research in uptake mechanisms and factors that influence the uptake is needed for practical application.
In the United States, endrin was mainly disposed in land until U.S. federal regulations were applied in 1987 on land disposal of wastes containing endrin. Primary methods of endrin disappearance from soil are volatilization and photodecomposition. Under ultraviolet light, endrin forms δ-ketoendrin and International Programme on Chemical Safety (IPCS) claims that in intense summer sun, about 50% of endrin is isomerized to δ-ketoendrin in 7 days. In anaerobic conditions microbial degradation by fungi and bacteria takes place to form the same major end product.
Removal from the environment
Endrin regularly enters the environment when applied to crops or when rain washes it off. It has been found in water, sediments, atmospheric air and biotic environment, even after uses have been stopped. adsorption coefficient, making it less likely to leach into groundwater, even though contaminated groundwater samples have been found. In 2009, EPA released data indicating that the endrin in soil could last up to 14 years or more. The extent of endrin's persistence depends highly on local conditions. For example, high temperature (230 °C) or intense sunlight leads to more rapid breakdown of endrin into endrin ketone and endrin aldehyde, however, this breakdown is less than 5%.
Insecticides like dieldrin and endrin have been shown to persist for decades in the environment. A definitive detection of the residues was not possible until 1971 when mass spectrometer started being used as a detector in gas chromatography. Detection of these chemicals in the environment has been reported across the world up to 2005, even though the frequency of reported cases are low due to its relatively small-scale use and very low concentrations.
Based on the demographics of the affected individuals and their area of residence, the outbreak was likely caused by endrin contamination of food. As members of these villages rarely had contact with one another, investigators determined that contaminated sugar shipped to the villages was the most probable cause, though no credible evidence was found to support this. Around this time, endrin was being used by cotton and sugar cane farmers in the Punjab region. A number of truck drivers stated that they had used the same trucks to deliver endrin to farmers and to pick up crops for Talagang, possibly leading to contamination.
From July 14 to September 26, 1984, an outbreak of endrin poisoning occurred in 21 villages in and around Talagang, a subdistrict of the Punjab province of Pakistan. Eighty percent of the 194 known cases were children under the age of 15. Poisoned individuals had seizures along with vomiting, pulmonary congestion, and hypoxia, leaving 19 people dead. Some individuals had low grade fevers (37.8 °C/100 °F, axillary) following seizures. The more seriously affected had less vomiting, but higher temperatures than people who were less affected. Most patients could be controlled in under two hours using diazepam, phenobarbital, and atropine, though the more seriously affected patients required general anesthesia. Recovery took up to two days. Following treatment, patients reported not remembering their seizures. The outbreak affected both men and women equally.
1984 poisoning outbreak in Pakistan
Higher doses of endrin have been found to cause the following in rodents: renal tubular necrosis; inflammation of the liver, fatty liver, and liver necrosis; possible kidney degradation; and a decrease in body weight and body weight gain.
Though endrin exposure has not been found to adversely affect fertility in mammals, an increase in fetal mortality has been observed in mice, rats, and mallard ducks. In those animals that have survived gestation, developmental abnormalities have been observed, particularly in rodents whose mothers were exposed to endrin early in pregnancy. In hamsters, the number of cases of fused ribs, cleft palate, open eyes, webbed feet, and meningoencephaloceles have increased. Along with open eyes and cleft palate, mice have developed with fused ribs and exencephaly. Skeletal abnormalities in rodents have also been reported.
People occupationally exposed to endrin may experience abnormal EEG readings even if they exhibit none of the clinical symptoms, possibly due to injury to the brain stem. These readings show bilateral synchronous theta waves with synchronous spike-and-wave complexes. EEG readings can take up to one month to return to normal.
Symptoms of endrin poisoning include headache, dizziness, nervousness, confusion, nausea, vomiting, and convulsions. Acute endrin poisoning in humans affects primarily the central nervous system. There, it can act as a neurotoxin that blocks the activity of inhibitory neurotransmitters. In cases of acute exposure, this may result in seizures, or even death. Because endrin can be stored in body fats, acute endrin poisoning can lead to recurrent seizures when stressors induce the release of endrin back into the body, even months after the initial exposure is terminated.
Upon entering the body, endrin metabolizes into anti-12-hydroxyendrin and other metabolites, which can be expelled in the urine and feces. Both anti-12-hydroxyendrin and its metabolite, 12-ketoendrin, are likely responsible for the toxicity of endrin. The rapid metabolism of endrin into these metabolites makes detection of endrin itself difficult unless exposure is very high.
Exposure to endrin can occur by inhalation, ingestion of substances containing the compound, or by skin contact. In addition to inhalation and skin contact, infants can be exposed by ingesting the breast milk of an exposed woman. In utero, fetuses are exposed by way of the placenta if the mother has been exposed.
Exposure and metabolism
A study conducted from 1981 to 1983 in the US aimed to determine endrin's effects on non-target organisms when applied as a rodenticide in orchards. Most wildlife in and around the orchard was found to have endrin exposure, with endrin toxicity accounting for more than 24% of bird deaths recorded. Endrin was eventually banned in the US on October 10, 1984.
Endrin has been used primarily as an agricultural insecticide on tobacco, apple trees, cotton, sugar cane, rice, cereal, and grains. It is effective against a variety of species, including cotton bollworms, corn borers, cut worms and grass hoppers. In addition, endrin has been employed as a rodenticide and avicide. In Malaysia, fish farms used a solution of endrin as a piscicide to rid mine pools and fish ponds of all fish prior to restocking.
Endrin was formulated as emulsifiable concentrates (ECs), wettable powders (WPs), granules, field strength dusts (FSDs), and pastes. The product could then be applied by aircraft or by handheld sprayers in its various formulations.
The synthesis of endrin begins with the condensation of hexachlorocyclopentadiene with vinyl chloride. The product is then dehydrochlorinated. Following reaction with cyclopentadiene, isodrin is formed. Epoxide formation by adding either peracetic acid or perbenzoic acid to the isodrin is the final step in synthesizing endrin.
 In May 2004, the
 Taiwan banned endrin's use as a pesticide in 1971 and regulated it as a toxic chemical in 1989. In 1962, an estimated 2.3-4.5 million kilograms of endrin were sold by Shell in the USA. In 1970, Japan imported 72,000 kilograms of endrin. From 1963 until 1972, Bali used 171 to 10,700 kilograms of endrin annually for the production of
J. Hyman & Company first developed endrin in 1950. Shell International was licensed in the United States and in the Netherlands to produce it. Velsicol was the other producer in the Netherlands. Endrin was used globally until the early 1970s. Due to its toxicity, it was banned or severely restricted in many countries. In 1982, Shell discontinued its manufacturing.
- History 1
- Production 2
- Use 3
Health effects 4
- Exposure and metabolism 4.1
- Neurological effects 4.2
- Developmental effects 4.3
- Other effects 4.4
- 1984 poisoning outbreak in Pakistan 4.5
Environmental behavior 5
- Removal from the environment 5.1
- United States 6.1
- International organizations 6.2
- Taiwan 6.3
- See also 7
- References 8
- External links 9
Although endrin is not currently classified as a mutagen, nor as a human carcinogen, it is still a toxic chemical in other ways with detrimental effects. Due to these toxic effects, the manufacturers cancelled all use of endrin in the United States by 1991. Food import concerns have been raised because some countries may have still been using endrin as a pesticide.
In the environment endrin exists as either endrin aldehyde or endrin ketone and can be found mainly in bottom sediments of bodies of water. Exposure to endrin can occur by inhalation, ingestion of substances containing the compound, or skin contact. Upon entering the body, it can be stored in body fats and can act as a neurotoxin on the central nervous system, which can cause convulsions, seizures, or even death.