Agent Name

Fenthion

CAS Number

55-38-9

Formula

C10-H15-O3-P-S2

Major Category

Pesticides

Synonyms

4-Methylmercapto-3-methylphenyl dimethyl thiophosphate; B 29493; BAY 29493; Bay-Bassa; Baycid; Bayer 29493; Bayer 9007; Bayer S-1752; Baytex; Entex; Fenthion 4E; Fenthion-methyl; Fenthione; Figuron; Lebaycid; MPP; MPP (pesticide); Mercaptophos; O,O-Dimethyl O-(3-methyl-4-(methylthio)phenyl)phosphorothioate; O,O-Dimethyl O-(3-methyl-4-methylmercaptophenyl)phosphorothioate; O,O-Dimethyl O-(3-methyl-4-methylthio-fenyl)-monothiofosfaat [Dutch]; O,O-Dimethyl O-(4-(methylthio)-m-tolyl) phosphorothioate; O,O-Dimethyl O-(4-methylmercapto-3-methylphenyl) thionophosphate; O,O-Dimethyl O-(4-methylthio-3-methylphenyl) phosphorothioate; O,O-Dimethyl O-(4-methylthio-3-methylphenyl) thiophosphate; O,O-Dimethyl O-3-methyl-4-methylthiophenyl phosphorothioate; O,O-Dimethyl O-4-(methylmercapto)-3-methylphenyl phosphorothioate; O,O-Dimethyl-O-(3-methyl-4-methylmercaptophenyl)phosphorothioate; O,O-Dimethyl-O-(3-methyl-4-methylthio-fenyl)-monothiofosfaat [Dutch]; O,O-Dimethyl-O-(3-methyl-4-methylthio-phenyl)-thionophosphat [German]; O,O-Dimethyl-O-(3-methyl-4-methylthiophenyl)-monothiophosphat [German]; O,O-Dimethyl-O-4-(methylmercapto)-3-methylphenyl phosphorothioate; O,O-Dimethyl-O-4-(methylmercapto)-3-methylphenyl thiophosphate; O,O-Dimetil-O-(3-metil-4-metiltio-fenil)-monotiofosfato [Italian]; OMS 2; Phenthion; Pro-Spot; Queletox; S 1752; Spotton; Sulfidophos; Talodex; Thiophosphate de O,O-dimethyle et de O-(3-methyl-4-methylthiophenyle) [French]; Tiguvon; m-Cresol, 4-(methylthio)-, O-ester with O,O-dimethyl phosphorothioate; [ChemIDplus]

Category

Organophosphate Insecticides

Description

Colorless to brown liquid with a slight, garlic-like odor. [insecticide]; [NIOSH]

Sources/Uses

Used to kill fruit flies, stem borers, mosquitoes, and Eurygaster cereal bugs; it is also applied as paste to bird roosting areas to kill pigeons and other bird pests; [EXTOXNET]

Comments

Classified as "moderately toxic"; All bird control products and nondomestic, nongranular formulations of greater than 70% fenthion may be used only by certified applicators; it is not licensed for use on food crops; [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

EXTOXNET PIP - FENTHION

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)

0.05 mg/m3, inhalable fraction and vapor

MAK

0.2 mg/m3, inhalable fraction

Vapor Pressure

3.0E-5 mm Hg

Reference Link

EPA Pesticide Chemical Search

Adverse Effects
Other Poison

Organophosphate

ACGIH Carcinogen

Not Classifiable

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

Search ChemIDplus

Biomedical References

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Related Information in HazMap
Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: