ARS PESTICIDE PROPERTIES last update May 1995 name:FENTHION CASRN: 55-38-9 molecular formula: C10H15O3PS2 molecular weight : 278.33 physical state : L (L=liquid; G=gas; S=solid) reference: 9MILES _________________________________________________________________________ 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): 87 - 0.01mmHg H 9ACHB2, 2ND ED.,1987 Melting point(deg C): 7 - H 9ACHB2,2ND ED.,1987 Decomposition point(deg C): - Heat of vaporization(deg C): --RATE CONSTANTS-- Hydrolysis (per day): 0.022* 30 5 M 6MILES 0.027* 30 7 M 6MILES 0.029* 30 9 M 6MILES Photolysis (per day): 2.52* SOIL OD M 6MILES 34.7* WATER 23 M 6MILES Vapor pressure (mPa): 0.37 20 M 6MILES 4.0 20 H 9ACHB2,2ND ED.,1987 10.0 30 H 9ACHB2,2ND ED.,1987 0.37* 20 Water solubility (ppm): -temp- -source- -reference- 9.3 20 E JPFCD2,VB20(6):627,1985 6.4 10 E JPFCD2,VB20(6):627,1985 11.3 30 E JPFCD2,VB20(6):627,1985 4.2* 20 M 6MILES 7.5 20 E JPFCD2,VB18(2):225,1983 2.0 20 H 9PMED8,8TH ED.,p.387,1987 Organic solubility (ppm): 5.0E+5 2-PROPANOL LOW 20 M 6MILES 1.2E+6 2-PROPANOL HIGH 20 M 6MILES >1.0E+6* DICHLOROMETHANE 20 M 6MILES >1.0E+6* TOLUENE 20 M 6MILES 9E+5* 2-PROPANOL 20 Henrys law (Pa m3/mol): 2.2E-2 20 R 9HRLCP 2.4E-2 20 M 6MILES 0.024* 20 Octanol/water partitioning (log Kow): 4.84* 20 M 6MILES Acid dissociation (pKa): Soil sorption: soiltype temp. Kd Koc %om pH reference SANDY LOAM 38.0 2179 3.0 5.5 6MILES SILT LOAM 19.8 1622 2.1 6.7 6MILES SAND 36.2 1683 3.7 6.9 6MILES SANDY LOAM 7.7 946 1.4 7.7 6MILES SILT LOAM 12.4 1066 2.0 6.3 6MILES SAND 25 8.621 1638** 1.0 4.3 6MILES SANDY LOAM 25 6.424 1110** 1.1 6.6 6MILES SILT LOAM 25 15.81 1036** 2.9 5.9 6MILES CLAY LOAM 25 16.21 1400** 2.2 6.4 6MILES 1390* Field Dissipation halflife(days): value test area pH source reference 112 KS M 6MILES 32 KS M 6MILES 26 KS M 6MILES 35 KS M 6MILES 28 KS M 6MILES 10 KS M 6MILES 10 FL M 6MILES 20 FL M 6MILES 34(10-112)* Halflife in soil: Soiltype aerobic anaerobic source reference SILT LOAM <1* M 6MILES Comments: SOIL SORPTION KOC VALUES WITH A DOUBLE ASTERISK WERE CALCULATED USING A CONVERSION FACTOR OF 1.9(%OM=1.9%OC) RATHER THAN 1.72. SELECTED=1390(946-2179)