Terbufos

Agent Name
Terbufos
CAS Number
13071-79-9
Formula
C9-H21-O2-P-S3
Major Category
Pesticides
Terbufos formula graphical representation
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

Exposure Assessment

BEI
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]
Skin Designation (ACGIH)
Yes
TLV (ACGIH)
0.01 mg/m3, inhalable fraction and vapor
Vapor Pressure
0.00032 mm Hg
Reference Link #2

Adverse Effects

ACGIH Carcinogen
Not Classifiable
Other Poison
Organophosphate

Diseases, Processes, and Activities Linked to This Agent

Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: