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Parathion Structure

Parathion

Chemical Properties

Melting point 6.1°C
Boiling point 375°C
Density  1.26
vapor pressure  0.470 at 20 °C, 0.942 at 25 °C, 1.84 at 30 °C, 3.53 at 35 °C, 6.62 at 40 °C, 12.18 at 45 °C (gassaturation method, Spencer et al., 1979)
refractive index  nD25 1.5370
Flash point 120 °C
storage temp.  APPROX 4°C
solubility  2,900 and 2,700 g/kg in petroleum ether and heptane, respectively (Williams, 1951)
form  liquid
color  Pale-yellow liquid
Water Solubility  Slightly soluble
Merck  13,7105
BRN  8912188
Henry's Law Constant 8.56 at 25 °C (wetted-wall column, Fendinger and Glotfelty, 1990)
Exposure limits NIOSH REL: TWA 0.05 mg/m3, IDLH 10 mg/m3; OSHA PEL: TWA 0.1 mg/m3.
Stability Hygroscopic, Moisture Sensitive
CAS DataBase Reference 56-38-2(CAS DataBase Reference)
IARC 2B (Vol. 30, Sup 7, 112) 2017
NIST Chemistry Reference Ethyl parathion (o,o-diethyl-o-p-nitrophenylthiophosphate)(56-38-2)
EPA Substance Registry System Parathion (56-38-2)

Safety Information

Hazard Codes  T+;N,N,T+,Xn,F
Risk Statements  24-26/28-48/25-50/53-67-65-38-11
Safety Statements  28-36/37-45-60-61-62-16
RIDADR  UN 3278
WGK Germany  3
RTECS  TF4550000
HazardClass  6.1(a)
PackingGroup  I
HS Code  29201100
Hazardous Substances Data 56-38-2(Hazardous Substances Data)
Toxicity LD50 in female, male rats (mg/kg): 3.6, 13 orally; 6.8, 21 dermally (Gaines)
IDLA 10 mg/m3

Usage And Synthesis