Temephos

Synonyms

Abate; AC 52160; Abaphos; Abate; Abate 4-E; Abathion; American cyanamid AC 52,160; American cyanamid CL-52160; American cyanamid E.I. 52,160; Biothion; Bis-p-(O,O-dimethyl O-phenylphosphorothioate)sulfide; Bithion; CL 52160; Difenphos; Difos; Diphos; Diphos (pesticide); EI 52160; Ecopro 1707; Etidronsaeure; Experimental insecticide 52160; Lypor; Nephis; Nephis 1G; Nimitex; Nimitox; O,O'-(Thiodi-4,1-phenylene) O,O,O',O'-tetramethyl di(phosphorothioate); O,O'-(Thiodi-4,1-phenylene)bis(O,O-dimethyl phosphorothioate); O,O'-(Thiodi-4,1-phenylene)phosphorothioic acid O,O,O',O'-tetramethyl ester; O,O'-(Thiodi-p-phenylene) O,O,O',O'-tetramethyl bis(phosphorothioate); O,O'-(Thiodi-p-phenylene) O,O,O',O'-tetramethyl di(phosphorothioate); O,O,O',O'-Tetramethyl O,O'-thiodi-P-phenylene bis(phosphorothioate); O,O,O',O'-Tetramethyl O,O'-thiodi-p-phenylene diphosphorothioate; O,O-Dimethyl phosphorothioate O,O-diester with 4,4'-thiodiphenol; OMS 786; Phenol, 4,4'-thiodi-, O,O-diester with O,O-dimethyl phosphorothioate; Phosphorothioic acid, O,O'-(thiodi-p-phenylene) O,O,O',O'-tetramethyl ester (8CI); Procida; Swebat; Swebate; Temefos; Temefosum [INN-Latin]; Tetrafenphos; Tetramethyl O,O'-thiodi-p-phenylene phosphorothioate; [ChemIDplus]

Category

Organophosphate Insecticides

Description

White, crystalline solid or liquid (above 87 degrees F). [insecticide] [Note: Technical grade is a viscous, brown liquid.]; [NIOSH]

Sources/Uses

Used to kill mosquito, midge, and black fly larvae in lakes, ponds, and wetlands; also used to kill fleas and human lice; [EXTOXNET]

Comments

Classified as "slightly toxic" with an LD50 of 5 gm/kg for the 2% powder formulation; [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

1 mg/m3, inhalable particulate matter

15 mg/m3(total dust), 5 mg/m3(respirable fraction)

7E-08 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)