Parathion methyl
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Parathion methyl, or methyl parathion, is an organophosphate insecticide, possessing an organothiophosphate group. It is structurally very similar to parathion-ethyl. It is not allowed for sale and import in nearly all countries around the world, while a few allow it under subject to specified conditions only.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
O,O-Dimethyl-O-p-nitrophenylphosphorothioate | |
Other names
Azophos, Methyl parathion, O,O-Dimethyl O-4-nitrophenyl phosphorothioate, O,O-Dimethyl-p-nitrophenylthionophosphate | |
Identifiers | |
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3D model (JSmol) |
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ChemSpider | |
ECHA InfoCard | 100.005.501 |
EC Number |
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PubChem CID |
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RTECS number |
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UNII | |
UN number | 2783 |
CompTox Dashboard (EPA) |
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Properties | |
(CH3O)2P(S)OC6H4NO2 | |
Molar mass | 263.2 g/mol |
Appearance | White to tan, crystalline solid or powder[1] |
Odor | pungent, garlic-like[1] |
Density | 1.36 g/mL (20°C)[1] |
Melting point | 37 °C; 99 °F; 310 K[1] |
Boiling point | 143 °C; 289 °F; 416 K[1] |
0.006% (25°C)[1] | |
Vapor pressure | 0.00001 mmHg (20°C)[1] |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards |
reactive with strong oxidizers and water[1] |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
67 mg/kg (rat, dermal)[2] 10-25 mg/kg (male rat, oral)[3] 24 mg/kg (female rat, oral)[3] |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
none[1] |
REL (Recommended) |
TWA 0.2 mg/m3 [skin][1] |
IDLH (Immediate danger) |
N.D.[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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