Chlormephos

Synonyms

Chlormefos; Chlormethylfos; Dotan; MC 2188; Phosphorodithioic acid, S-(chloromethyl) O,O-diethyl ester; S-(Chloromethy) O,O-diethyl phosphorodithioate; S-(Chloromethyl) O,O-diethylphosphorodithioate; S-Chloromethyl O,O-diethyl phosphorodithioate; S-Chloromethyl-O,O-diethylphosphorothiolothionate; [ChemIDplus] UN3018

Category

Organophosphate Insecticides

Description

Water-white liquid; [Merck Index] Colorless liquid; [ICSC]

Sources/Uses

Used as insecticide applied to soil; [Merck Index]

Comments

A non-systemic cholinesterase inhibitor; [Merck Index] May be absorbed through skin; A cholinesterase inhibitor; [ICSC] “The average of two baseline respective cholinesterase activity determinations three days apart, with no exposures to enzyme inhibiting pesticides for at least 30 days, is recommended for each worker prior to exposure to cholinesterase inhibitors because of large inter-individual differences in published baseline values. To be established at least once a year. Removal from workplace exposures is recommended until the cholinesterase activity returns to within 20% of baseline.” [TLVs and BEIs]

Not registered as a pesticide for use in the US; [CAMEO] Banned in the EU for use as a biocide and agricultural insecticide; [eChemPortal: ESIS]

Biomedical References

Acetylcholinesterase activity in red blood cells = 70% of individual's baseline; Butylcholinesterase activity in serum or plasma = 60% of individual's baseline; Sample at end of shift; [TLVs and BEIs]

LC50 (rat) = 88 mg/m3/4h

Explanatory Notes

VP = 0.057 mm Hg at 30 deg C; [Merck Index] The Guide in the Emergency Response Guidebook is for "Organophosphorus pesticide, liquid, toxic."

Other Poison

Organophosphate

Diseases

Occupational diseases associated with exposure to this agent:

• Organophosphates & carbamates, acute poisoning

Processes

Industrial Processes with risk of exposure:

• Farming (Pesticides)