Agent Name

Methyl parathion

CAS Number

298-00-0

Formula

C8-H10-N-O5-P-S

Major Category

Pesticides

Synonyms

8056HC; A-GRO; Azofos; Azophos; BAY 11405; BAY E-601; Bladan-M; Cekumethion; Dalf; Demethylfenitrothion; Devithion; Dimethyl 4-nitrophenyl phosphorothionate; Dimethyl p-nitrophenyl monothiophosphate; Dimethyl p-nitrophenyl phosphorothionate; Dimethyl p-nitrophenyl thiophosphate; Dimethyl parathion; Dimethyl-p-nitrophenyl thionphosphate; Drexel methyl parathion 4E; E 601; EPA Shaughnessy Code: 053501; Folidol 600; Folidol M; Folidol M 50; Folidol M-40; Folidol-80; Fosferno M 50; Kilex parathion; M-Parathion; M40 & 80; ME 605; Me 605SP; Me-parathion; Mepaton; Meptox; Metacid 50; Metacide; Metacide (insecticide); Metafos; Metafos (pesticide); Metaphos; Methyl 1605; Methyl fosferno; Methyl niran; Methyl-E 605; Methylparathion; Methylthiophos; Metilparation (Hungarian); Metron; Metron (pesticide); Metyloparation [Polish]; Metylparation [Czech]; Nitrox; Nitrox 80; O,O-Dimethyl O-(p-nitrophenyl) phosphorothioate; O,O-Dimethyl O-(p-nitrophenyl) thionophosphate; O,O-Dimethyl O-p-nitrophenyl thiophosphate; O,O-Dimethyl-O-(4-nitro-fenyl)-monothiofosfaat [Dutch]; O,O-Dimethyl-O-(4-nitro-phenyl)-monothiophosphat [German]; O,O-Dimethyl-O-(4-nitrophenyl) phosphorothioate; O,O-Dimethyl-O-(4-nitrophenyl)-thionophosphat [German]; O,O-Dimethyl-O-(p-nitrophenyl)-thionophosphat [German]; O,O-Dimethyl-O-p-nitrofenylester kyseliny thiofosforecne [Czech]; O,O-Dimethyl-O-p-nitrofenylthiofosfat [Czech]; O,O-Dimetil-O-(4-nitro-fenil)-monotiofosfato [Italian]; Oleovofotox; Parapest M-50; Parathion methyl; Parathion methyl homolog; Parathion-methyl; Parathion-metile [Italian]; Paratox; Paratuf; Parton-M; Partron M; Penncap MLS; Penncap-M; Phenol, p-nitro-, O-ester with O,O-dimethyl phosphorothioate; Phenol, p-nitro-, O-ester with O,O-dimethylphosphorothioate; Quinophos; Sinafid M-48; Tekwaisa; Thiophenit; Thiophosphate de O,O-dimethyle et de O-(4-nitrophenyle) [French]; Thylpar M-50; Vofatox; Wofatox; Wofatox 50 EC; Wofatox 80; Yphos; p-Nitrophenyldimethylthionophosphate; [ChemIDplus]

Category

Organophosphate Insecticides

Description

White to tan, crystalline solid or powder with a pungent, garlic-like odor. [pesticide]; [NIOSH]

Sources/Uses

Used to kill boll weevils on cotton; [EXTOXNET]

Comments

Classified as "highly toxic," and most formulations may be used only by certified applicators; [EXTOXNET] Allergic contact dermatitis reported in sprayers; [Kanerva, p. 1431]

Reference Link

EXTOXNET PIP - METHYL PARATHION

Exposure Assessment
BEI

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

Skin Designation (ACGIH)

Yes

TLV (ACGIH)

0.02 mg/m3, inhalable fraction and vapor

Vapor Pressure

3.5E-6 mm Hg

Odor Threshold Low

0.0012 mg/m3

Lethal Concentration

LC50 (rat) = 34 mg/m3/4h

Explanatory Notes

Odor threshold from AIHA;

Reference Link

ATSDR - ToxFAQs - Methyl Parathion

Adverse Effects
Skin Sensitizer

Yes

Other Poison

Organophosphate

IARC Carcinogen

Not Classifiable

ACGIH Carcinogen

Not Classifiable

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

Search TOXNET

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: