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Mevinphos

Overview
 
CAS Number: 7786-34-7
Synonyms: Apavinphos, Duraphos, Fosdrin, Gesfid, Menite, Mevinox, Phosdrin, Phosfene
Contaminant Type: Chemical

Mevinphos is an organophosphorus insecticide, which was used to control a broad spectrum of insects on forage, vegetables, and fruit crops [1637].  It ia also an acaracide.  Its CAS name is 3-[(Dimethoxyphosphinyl)oxy]-2-butenoate.

Mevinphos was initially registered as a pesticide in 1957 [1638]. However, mevinphos was determined ineligible for reregistration by the U.S. Environmental Protection Agency (USEPA) in 1994 [1638]. Its sale and distribution was prohibited after December 31, 1994, and its use was completely banned after February 28, 1995 [1638].

Mevinphos is highly toxic via oral and dermal routes. It is a cholinesterase inhibitor.  [1652, 1653]  When humans are exposed to mevinphos, poisoning symptoms may appear in fifteen minutes to two days [1652]. Symptoms may include numbness, tingling sensation, headache, dizziness, difficulty breathing, blurred vision, abdominal cramps, slow heartbeat, even unconsciousness or fatality [1652].  It is not known to be carcinogenic.

Mevinphos is miscible with water. Its hydrolysis half-lives were reported as 120 days, 35 days, 3 days and 1.4 hours at pH 6, 7, 9 and 11, respectively [1642]. Thus, the rate of hydroloysis is a function of pH. Mevinphos' degradation rate was reported similar in natural water and de-ionized water with and without sterilization, which suggest chemical degradation plays a primary role [1647]. Its half life in soils was reported in the range of 3 to 13 days [1640, 1648]. Due to its short life time in water, mevinphos is not expected to reach groundwater.  It does not sorb to soil particles.

Mevinphos is currently not regulated by USEPA for drinking water.

Mevinphos has rarely been detected in drinking water sources [1649, 1650, 1651]. For example, mevinphos was not found in any of 665 wells monitored throughout the U.S. over a 20-year period between 1971 and 1991 in a study compiled by USEPA Office of Prevention Pesticides and Toxic Substances [1649].  In addtion, mevinphos was not found in any of  29 wells in California study conducted in the early 1980s [1650].

Date of Literature Search: August 2010



1637 EXTOXNET; 2010; Mevinphos; http://extoxnet.orst.edu/pips/mevinpho.htm; As posted on June 23, 2010, Extension Toxicology Network, Oregon.
1638 USEPA; 1994; Mevinphos R.E.D. Facts; Mevinphos R.E.D. Facts; EPA-738-f-94_020. pp. 1-5. Office of Prevention, Pesticides and Toxic Substances, U.S. Environmental Protection Agency, Washington, DC.
1640 Ware, G.W.(Ed.), Bro-Rasmussen, F.(Ed.), Crosby, D.G.(Ed.), Linskens, H.F.(Ed.), Melnikov, N.N.(Ed.), Mestres, R.(Ed.), Pietri-Tonelli, P.D.(Ed.) and Yang, R.S.H.(Ed.); 1992; Reviews of Environmental Contamination and Toxicology; Reviews of Environmental Contamination and Toxicology; Vol. 123, pp. 30 and 117, Springer-Verlag, New York, N.Y.
1642 Worthing, C.R. (Ed.); 1983; Mevinphos; The Pesticide Manual A World Compendium; pp. 381, The British Crop Protection Council, Lavenham, Suffolk, Great Britain.
1647 Sharom, M.S., Miles, J.R.W., Harris, C.R. and McEwen, F.L.; 1980; Persistence of 12 insecticides in water; Wat. Res.; 14:8:1089
1648 Sattar, M.A.; 1990; Fate of organophosphorus pesticides in soils; Chemosphere; 20:3/4:387
1649 Jacoby, H., Hoheisel, C., Karrie, J., Lees, S., Davies-Hilliard, L., Hannon, P., Bingham, R., Behl, E., Wells, D. and Waldman, E.; 1992; Pesticides in Ground Water Database - A Compilation of Monitoring Studies: 1971 - 1991, National Summary.; Pesticides in Ground Water Database - A Compilation of Monitoring Studies: 1971 - 1991, National Summary.; EPA 734-12-92-001. pp. 54 and 140. Office of Prevention Pesticides and Toxic Substances, U.S. Environmental Protection Agency, Washington, DC.
1650 Maddy, K.T., Fong, H.R., Lowe, J.A., Conrad, D.W. and Fredrickson, A.S.; 1982; A study of well water in selected California communities for residues of 1,3-dicholoropropene, cholorallyl alcohol and 49 organophosphate or chlorinated hydrocarbon pesticides; Bull. Environm. Contam. Toxicol.; 29:354
1651 Frank, R., Clegg, S., Ripley, B.D. and Braun, H.E.; 1987; Investigations of pesticide contaminations in rural wells, 1979 - 1984, Ontario, Canada; Arch. Environ. Contam. Toxicol.; 16:1:9
1652 Gallo, M.A. and Lawryk, N.J.; 1991; Organic Phosphorus Pesticides; Handbook of Pesticide Toxicology ; pp. 5-3. Hayes, W.J., Jr., and Laws, E.R., Jr. (Ed.), Academic Press, New York, NY. <http://extoxnet.orst.edu/pips/mevinpho.htm> [cited August 20, 2010].
1653 Ware, G.W.; 1986; Fundamentals of Pesticides: A Self-Instruction Guide; Fundamentals of Pesticides: A Self-Instruction Guide; pp. 5-4. Thompson Publications, Fresno, CA. <http://extoxnet.orst.edu/pips/mevinpho.htm> [cited August 20, 2010].



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