Agent Name

Chlorthiophos

CAS Number

21923-23-9

Formula

C11-H15-Cl2-O3-P-S2

Major Category

Pesticides

Synonyms

CELA S-2957; CM S 2957; Celamerck S-2957; Celathion; Chlorthiophos I; ENT 27635; O-(2,5-Dichloro-4-(methylthio)phenyl) O,O-diethyl phosphorothioate; O-(Dichloro(methylthio)phenyl) O,O-diethyl phosphorothioate (3 isomers); OMS 1342; Phosphorothioic acid, O-(2,5-dichloro-4-(methylthio)phenyl) O,O-diethyl ester; S 2957; [ChemIDplus]

Category

Organophosphate Insecticides

Description

Brown liquid; [HSDB] Yellow-brown liquid; Tendency to crystallize below 25 deg C; [CAMEO]

Sources/Uses

Used as insecticide and acaricide; [HSDB]

Comments

A cholinesterase inhibitor; May be absorbed through skin; [CAMEO] Effects in high-dose animal studies include convulsions, dyspnea, and inhibition of cholinesterase; [RTECS]

Exposure Assessment
BEI

Cholinesterase activity in red cells = 70% of individual's baseline, sample time discretionary; [ACGIH]

Vapor Pressure

2.4E-6 mm Hg

Adverse Effects
Other Poison

Organophosphate

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