Terbufos

Synonyms

Contraven; Counter; Counter 15G soil insecticide; Counter 15G soil insecticide-nematicide; Phosphorodithioic acid S-(((1,1-dimethylethyl)thio)methyl) O,O-diethyl ester; Phosphorodithioic acid S-((tert-butylthio)methyl) O,O- diethyl ester; S-(((1,1-Dimethylethyl)thio)methyl) O,O-diethyl phosphorodithioate; S-(((1,1-Dimethylethyl)thio)methyl)-O,O-diethyl phosphorodithioate; S-((tert-Butylthio)methyl)O,O-diethylphosphorodithioate; S-tert-Butylthiomethyl O,O-diethyl phosphorodithioate; St-100; [ChemIDplus]

Category

Organophosphate Insecticides

Description

Clear to slightly brown liquid; [ACGIH]

Sources/Uses

Used as a granular insecticide and nematicide applied to the soil for crops of corn, grain, sorghum, sugar beets, and bananas; [ACGIH]

Comments

Products containing >15% terbufos are Restricted Use Pesticides to be handled only by certified applicators. [EXTOXNET] “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]

Reference Link #1

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]

Yes

0.01 mg/m3, inhalable fraction and vapor

0.00032 mm Hg

Reference Link #2

Not Classifiable

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)