ARS PESTICIDE PROPERTIES last update May 1995 name:PARATHION CASRN: 56-38-2 molecular formula: C10H14NO5PS molecular weight : 291.27 physical state : L (L=liquid; G=gas; S=solid) reference: 9ACHB2 _________________________________________________________________________ Key to sources: (M)Manufacturer, (R)eview, (H)andbook, (E)xperiment, (C)alculated, (U)nknown, (P)EPA data, (W)auchope * denotes a selected value where multiple values of a property are listed. _________________________________________________________________________ -value- -medium- -temp- -pH- -source- -reference- Boiling point(deg C): 150 - 0.6mmHg H 9ACHB2 Melting point(deg C): - Decomposition point(deg C): - Heat of vaporization(deg C): --RATE CONSTANTS-- Hydrolysis (per day): STABLE 25 1-4 H 9PME10 .0025 22 4 H 9PME10 .0027 22 7 H 9PME10 .0053 22 9 H 9PME10 Photolysis (per day): Vapor pressure (mPa): 0.76 20 E PSSCBG 4:137-147,1973 1.3 20 E JAFCAU 29:616-621,1981 3 30 E JAFCAU 18:814-818,1970 0.67 20 R 9HRLCP 0.89* 20 H 9PME10 Water solubility (ppm): -temp- -source- -reference- 24 25 H 9ACHB2 1983 ED. H 9ACHB2 7TH ED.,1977 14 C JPFCD2 22:55-69,1987 11* 20 H 9PME10 Organic solubility (ppm): MISCIBLE MOST ORG. SOLVS. H 9PMED8 SL. SOLUBE PETROLEUM OILS H 9PMED8 Henrys law (Pa m3/mol): 0.024* H 9PME10 Octanol/water partitioning (log Kow): 3.83 H 9PME10 Acid dissociation (pKa): Soil sorption: soiltype temp. Kd Koc %om pH reference 10650 8SWAMD 9EINSP PP.23-67 350 JAFCAU 29:1050-1059,1981 1148 ESTHAG 15:1360-1367,1981 1720 8CREAM 800 8CREAM 3300 JPFCD2 22:55-69,1987 1100 JEVQAA 16:422-428,1987 SCSFAD 44:1-8,1985 8300 8INSFO 5862 8EPAHO 9914 8EPAHO 21159 8EPAHO 34674 8EPAHO 7161 8AGMAW 7660* Field Dissipation halflife(days): value test area pH source reference 18-35 R 9EINSP PP.23-67 15 R RREVAH 85:139-147,1983 7-12 P 8EPAHO 35 R 8INSFO 13 E JEVQAA 16:422-428,1987 14* E SCSFAD 44:1-8,1985 Halflife in soil: Soiltype aerobic anaerobic source reference Comments: