Agent Name

O-Ethyl methylphosphonothioate

Alternative Name

EMPTA

CAS Number

18005-40-8

Formula

C3-H9-O2-P-S

Major Category

Toxic Gases & Vapors

Synonyms

Phosphonothioic acid, methyl-, O-ethyl ester; [ChemIDplus] EMPTA; P-Methylphosphonothioic acid O-ethyl ester; [Merck Index] UN2927

Category

Chemical Weapons

Description

Yellowish liquid; [Merck Index] Light yellow liquid; [Sigma-Aldrich MSDS]

Sources/Uses

Degradation product and precursor of the warfare agent VX; [Merck Index]

Comments

A cholinesterase inhibitor; [Merck Index] Causes burns; Inhalation may cause corrosive injuries to upper respiratory tract and lungs; Toxic by ingestion, inhalation, and skin absorption; Targets the CNS, heart, blood, and eyes; [Sigma-Aldrich MSDS]

Exposure Assessment
Vapor Pressure

0.31 mm Hg

Explanatory Notes

The Guide in the Emergency Response Guidebook is for "Toxic liquid, corrosive, organic, n.o.s."

Adverse Effects
Toxic Pneumonitis

Yes

Other Poison

Organophosphate

Dermatotoxin

Skin Burns

Links to Other NLM Databases
Toxicity Information

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Chemical Information

Search ChemIDplus

Related Information in HazMap
Other Information

No other related information on this agent was found.