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298-00-0

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Basic Information
CAS No.: 298-00-0
Name: Parathion-methyl
Article Data: 23
Molecular Structure:
Molecular Structure of 298-00-0 (Parathion-methyl)
Formula: C8H10NO5PS
Molecular Weight: 263.211
Synonyms: Phosphorothioicacid, O,O-dimethyl O-(p-nitrophenyl) ester (6CI,8CI);Azofos;BAY 11405;Bravik;Dalf;Demethylfenitrothion;Dimethyl4-nitrophenyl phosphorothioate;Dimethyl p-nitrophenyl phosphorothionate;Paratuf;Penncap M;Quinophos;Wofatox;Yphos;Dimethyl p-nitrophenyl thiophosphate;Dimethyl parathion;Folidol 600;FolidolM;Folidol M 40;Folisuper 600BR;Mentox 600CE;Meptox;Metacid;Metacid 50;Metacide;Metacide(insecticide);Metaphos;Methyl 1605;Methyl 4E;Methyl E 605;Metron(pesticide);Morphos;Nitrox;Nitrox 80;O,O-Dimethyl O-(4-nitrophenyl)phosphorothioate;O,O-Dimethyl O-(p-nitrophenyl)thiophosphate;Parataf;Parathion M;
EINECS: 206-050-1
Density: 1.411 g/cm3
Melting Point: 36 °C
Boiling Point: 334.7 °C at 760 mmHg
Flash Point: 156.2 °C
Solubility: 0.005 g/100 mL in water
Appearance: white crystalline powder
Hazard Symbols: VeryT+, DangerousN, HarmfulXn, FlammableF
Risk Codes: 5-24-26/28-48/22-50/53-10-67-66-51/53-36-20/22-11-65-38
Safety: 28-36/37-45-60-61-26-62
Transport Information: UN 2052/2783/2811
PSA: 115.41000
LogP: 3.66470
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Chemistry

Name:Parathion-methyl
Synonyms:O,O-Dimethyl O-(p-nitrophenyl) thionophosphate; Methyl parathion
Molecular Structure :   
Molecular Formula:C8H10NO5PS
Molecular Weight:263.20
EINECS:206-050-1
Density:1.36
Melting point:36 oC
Boiling point:143 oC (1.0 mmHg)
Flash point:46.1 oC
Water solubility:0.005 g/100 mL

Toxicity Data With Reference

1.   

mmo-sat 667 µg/plate

   ENMUDM    Environmental Mutagenesis. 5 (Suppl 1)(1983),3.
2.   

sce-hmn:lym 10 mg/L

   MUREAV    Mutation Research. 88 (1981),307.
3.   

orl-rat LD50:6 mg/kg

   28ZPAK    Sbornik Vysledku Toxixologickeho Vysetreni Latek A Pripravku Marhold, J.V.,Institut Pro Vychovu Vedoucicn Pracovniku Chemickeho Prumyclu Praha,Czechoslovakia.: 1972,208.
4.   

ihl-rat LC50:34 mg/m3/4H

   EGESAQ    Egeszsegtudomany. 34 (1980),173.
5.   

skn-rat LD50:63 mg/kg

   SPEADM    Special Publication of the Entomological Society of America. 78-1 ,1978.38.
6.   

ipr-rat LD50:2800 µg/kg

   APCRAW    Advances in Pest Control Research. 4 (1961),117.
7.   

scu-rat LD50:6 mg/kg

   JEENAI    Journal of Economic Entomology. 50 (1957),356.
8.   

ivn-rat LD50:9 mg/kg

   NTIS**    National Technical Information Service. (Springfield, VA 22161) (Formerly U.S. Clearinghouse for Scientific and Technical Information) No. PB277-077 .
9.   

orl-mus LD50:18 mg/kg

   85GMAT    Toxicometric Parameters of Industrial Toxic Chemicals Under Single Exposure Izmerov, N.F., et al.,Moscow, USSR.: Centre of International Projects, GKNT,1982,59.
10.

Consensus Reports

IARC Cancer Review: Group 3 IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 7 ,1987,p. 56.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal No Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 30 ,1983,p. 131.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) . NCI Carcinogenesis Bioassay (feed); No Evidence: mouse, rat NCITR*    National Cancer Institute Carcinogenesis Technical Report Series. (Bethesda, MD 20014) No. NCI-CG-TR-157 ,1979. . EPA Genetic Toxicology Program. EPA Extremely Hazardous Substances List.

Safety Profile

Poison by inhalation, ingestion, skin contact, subcutaneous, intravenous, and intraperitoneal routes. Fatal poisoning can result from skin or eye contact after very brief exposure to concentrated solution. Experimental teratogenic and reproductive effects. Questionable carcinogen. Human mutation data reported. A cholinesterase inhibitor type of insecticide. When heated to decomposition it emits very toxic fumes of NOx, POx, and SOx. See also PARATHION.

Standards and Recommendations

OSHA PEL: TWA 0.2 mg/m3 (skin)
ACGIH TLV: TWA 0.2 mg/m3 (skin); Not Classifiable as a Human Carcinogen
NIOSH REL: (Methyl Parathion) TWA 0.2 mg/m3
DOT Classification:  6.1; Label: Poison