Agent Name

Methyl demeton

Alternative Name

Demeton-methyl

CAS Number

8022-00-2

Formula

C6-H15-O3-P-S2

Major Category

Pesticides

Synonyms

Demeton-methyl; Bayer 21/116; Demeton M; Demeton methyl; Demeton-methyl; Metasystox; Metasystox forte; Methyl demeton 25 EC; Methyl mercaptophos; Methyl systox; Methyl-mercaptophos; Methylmerkaptofos [Czech]; Phosphorothioic acid, O-(2-(ethylthio)ethyl) O,O-dimethyl ester, mixt. With S-(2-(ethylthio)ethyl) O,O-dimethyl ester; S(and O)-2-(Ethylthio)ethyl O,O-dimethyl phosphorothioate; [ChemIDplus] UN3018

Category

Organophosphate Insecticides

Description

Oily, colorless to pale-yellow liquid with an unpleasant odor. [insecticide] [Note: Technical grade consists of 2 isomers: thiono & thiolo.]; [NIOSH]

Sources/Uses

Used to kill insects on garden crops, fruit, and hops; [ACGIH]

Comments

It is less toxic than demeton. [ACGIH] A cholinesterase inhibitor that may cause CNS effects; Can be absorbed through skin; [ICSC]

Restricted

Not registered for use in the US; [EPA PPIS]

Exposure Assessment
BEI

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

Skin Designation (ACGIH)

Yes

TLV (ACGIH)

0.05 mg/m3, inhalable fraction and vapor

MAK

4.8 mg/m3

Vapor Pressure

0.0004 mm Hg

Lethal Concentration

LCLo (cat) = 20 mg/m3/4hr

Explanatory Notes

The Guide in the Emergency Response Guidebook is for "Organophosphorus pesticide, liquid, toxic."

Adverse Effects
Other Poison

Organophosphate

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

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Related Information in HazMap
Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: