ARS PESTICIDE PROPERTIES last update May 1995 name:PHORATE CASRN: 298-02-2 molecular formula: C7H17O2PS3 molecular weight : 260.37 physical state : L (L=liquid; G=gas; S=solid) reference: _________________________________________________________________________ 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): 118 - 120 0.8mmHg M 9AMCY1 Melting point(deg C): -42.9 - M 9AMCY1 Decomposition point(deg C): - Heat of vaporization(deg C): --RATE CONSTANTS-- Hydrolysis (per day): 0.217* 25 5 M 9AMCY1 0.223 25 7 M 9AMCY1 0.313 25 9 M 9AMCY1 1.15-0.18 25 4.5-8.0 E JPFCD2,B17(5):487-504,1982 Photolysis (per day): 0.3758* SOIL 25 E 9AMCY1 0.229 WATER 25 M 9AMCY1 Vapor pressure (mPa): 85 25 H 9PME10 84.7* 25 M 9AMCY1 1170 35 M 9AMCY1 273 45 M 9AMCY1 Water solubility (ppm): -temp- -source- -reference- 50 25 H 9ACHB2 1983 ED.45 E ETOCDK 8:339-357,1989 16 E JPFCD2 22:55-69,1987 22* 25 M 9AMCY1 20 24 E JAFCAU,27(3):357,1979 17.9 20 E JPFCD2, B14(6):625,1979 Organic solubility (ppm): MISCIBLE ALCS,CCL4,ETHS,ESTRS* H 9PMED8 MISCIBLE DIOXANE,XYLENE* H 9PMED8 Henrys law (Pa m3/mol): 1.01* 25 M 9AMCY1 Octanol/water partitioning (log Kow): 3.92* 25 M 9AMCY1 2.92 E JAFCAU, 29:1050,1981 4.26 E JPFCD2,B17(5):487,1982 3.33 E JAFCAU, 27(3):557,1979 Acid dissociation (pKa): Soil sorption: soiltype temp. Kd Koc %om pH reference 432 JAFCAU, 27(3):557,1979 310 9AMCY1 627 9AMCY1 322 9AMCY1 545 9AMCY1 660 JEVQAA 16:422-428,1987 424 EESADV 93 EESADV 3255 EESADV 221 EESADV 3200 EESADV 510 EESADV 940 8GLEAM 1140 8CREAM 1660 ETOCDK 8:339-357,1989 2200 JPFCD2 22:55-69,1987 3230 8INSFO SANDY LOAM 2.3 455 0.88 7.30 JAFCAU,27(3):557,1979 LOAMY SAND 5.5 514 1.84 6.83 JAFCAU,27(3):557,1979 LOAM 9.6 364 4.56 5.00 JAFCAU,27(3):557,1979 CLAY LOAM 16.1 424 6.55 7.30 JAFCAU,27(3):557,1979 LOAM-CLAY LOAM 73.8 402 31.65 6.98 JAFCAU,27(3):557,1979 SAND 25 1.8 310 1.0 6.0 9AMCY1 SANDY LOAM 25 4. 627 1.1 6.9 9AMCY1 SILT LOAM 25 5.6 322 3.0 5.2 9AMCY1 LOAM 25 12.0 545 3.8 7.0 9AMCY1 1057* Field Dissipation halflife(days): value test area pH source reference 82 E JEVQAA 16:422-428,1987 23 C 8GLEAM 19-173 CA 90 E PSSCBG 19:101-112,1987 38 E ETOCDK 8:339-357,1989 2 SOIL GA M 9AMCY1 5 SOIL NE M 9AMCY1 12 SOIL IA M 9AMCY1 37(2-173)* Halflife in soil: Soiltype aerobic anaerobic source reference SANDY LOAM 3 M 9AMCY1 Comments: