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CAS Number: 298-04-4
Synonyms: Bayer 19639, Di-syston, Disipton, Disyston, Disystox, Frumin, Solvirex, Thiodemeton
Contaminant Type: Chemical

Disulfoton is an organothiophosphate insecticide and acaricide used to control a variety of harmful pests that attack many field and vegetable crops [1809].  It is used to protect small grains, sorghum, corn, and other field crops; some vegetables, fruit, and nut crops; and ornamental and potted plants against certain insects. Although it is used mostly in agriculture, small quantities are used on home and garden plants, and for mosquito control in swamps [1809].

Its IUPAC name is O,O-diethyl S-2-ethylthioethyl phosphorodithioate.

It is found mainly in soil and water. It binds moderately to soil and typically does not travel deep into soil with rainwater. In water, it takes about 7 days for half of it to break down. In soil, it takes about 3.5-290 days for half of it to break down, depending on soil type, moisture, and temperature [1809].  It breaks down in water under alkaline conditions.  It does not volatilize or photodegrade. 

Degradates in water are disulfoton sulfone and disulfoton sulfoxide.  Both are more persistent than the parent pesticide.

Several monitoring studies found disulfoton and the two degradates infrequently (less than 1%) in surface and finished drinking waters at concentrations below 1 ug/L.  Disulfoton has been found in wells at concentrations below 7 ug/L. 

Disulfoton is a rodent cholinesterase inhibitor with neural effects.  It has not been found to be carcinogenic.

It is not regulated in drinking water but is on the Contaminant Candidate List 3.

Date of literature search: 2010

1809 ATSDR; 1996; ToxFAQs for Disulfoton; http://www.atsdr.cdc.gov/toxfaqs/tf.asp?id=977&tid=205; As posted on September 1996, ATSDR, Department of Health and Human Services