ARS PESTICIDE PROPERTIES DATABASE last updated May 1995 name: CHLORPYRIFOS-METHYL CASRN: 5598-13-0 molecular formula: C7H7CL3NO3PS molecular weight: 322.5 physical state: S (L=liquid; G=gas; S=solid) reference: 9PMED7 __________________________________________________________________________ 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): Melting point (deg C): 45.5 - 46.5 H 9PME10 Decomposition point (deg C): Heat of vaporization (deg C): --RATE CONSTANTS-- Hydrolysis (per day): 0.231 8 H 9PME10 Photolysis (per day): Vapor pressure (mPa): 5.6 25 H 9PMED9 Water solubility (ppm): 4 24 H 9PMED7 Organic solubility (ppm): 6.4E6 ACETONE 24 H 9PME10 5.2E6 BENZENE 24 H 9PME10 4.8E6 DIETHYL ETHER 24 H 9PME10 3.5E6 CHLOROFORM 24 H 9PME10 3.0E5 METHANOL 24 H 9PME10 2.3E5 HEXANE 24 H 9PME10 Henrys law (Pa m3/mol): 0.45 24 H 9PMED9 Octanol/water partitioning (log Kow): 4.24 H 9PME10 Acid dissociation (pKa): Soil sorption: soiltype temp. Kd Koc %om pH reference -------- ----- -- --- --- -- --------- 3300 ESTHAG 14: 553-556 (1980) 3310 7SCHER 5729 ESTHAG 21: 358-366 (1987) 3000* W Field dissipation halflife(days): value test area pH source reference ----- --------- -- ------ --------- 4,21 E JAFCAU 30: 1032-1035 (1982) 1.5-33 H 9PME10 7* W Halflife in soil: soiltype aerobic anaerobic source reference -------- ------- --------- ------ --------- Comments: