Parathion methyl

Parathion methyl

Names
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
CAS Number	298-00-0
ChemSpider	3987
EC Number	015-035-00-7
Jmol 3D model	Interactive image
PubChem	4130
RTECS number	TG0175000
UN number	2783
InChI InChI=1S/C8H10NO5PS/c1-12-15(16,13-2)14-8-5-3-7(4-6-8)9(10)11/h3-6H,1-2H3 Key: RLBIQVVOMOPOHC-UHFFFAOYSA-N InChI=1/C8H10NO5PS/c1-12-15(16,13-2)14-8-5-3-7(4-6-8)9(10)11/h3-6H,1-2H3 Key: RLBIQVVOMOPOHC-UHFFFAOYAW
SMILES COP(=S)(OC)Oc1ccc(cc1)[N+](=O)[O-]
Properties
Chemical formula	(CH3O)2P(S)OC6H4NO2
Molar mass	263.2 g/mol
Appearance	White to tan, crystalline solid or powder
Odor	pungent, garlic-like
Density	1.36 g/mL (20°C)
Melting point	37 °C; 99 °F; 310 K
Boiling point	143 °C; 289 °F; 416 K
Solubility in water	0.006% (25°C)
Vapor pressure	0.00001 mmHg (20°C)
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Parathion methyl is an organophosphate pesticide and insecticide.

Applications

Parathion methyl is used as an insecticide on crops including cotton.

Safety

People can be exposed to parathion methyl in the workplace by breathing it in, getting it on their skin, swallowing it, or getting it in their eyes. The Occupational Safety and Health Administration (OSHA) has not set a legal limit (permissible exposure limit) for parathion methyl exposure in the workplace. The National Institute for Occupational Safety and Health (NIOSH) has set a recommended exposure limit (REL) of 0.2 mg/m³ over an 8-hour workday.

Since it is an acetylcholinesterase inhibitor, symptoms of exposure to parathion methyl include irritated eyes and skin, nausea and vomiting, abdominal pain, diarrhea, salivation, feeling weak and tired, headache, runny nose, tightness in the chest, blurry vision, pupil constriction, irregular heartbeat, muscle twitches (fasciculation), and difficulty breathing.

Parathion methyl is not classified as a carcinogen by any global agency.