ARS PESTICIDE PROPERTIES last update May 1995 name:TRICHLORFON CASRN: 52-68-6 molecular formula: C4H8CL3O4P molecular weight : 257.44 physical state : S (L=liquid; G=gas; S=solid) reference: 9MOBAY _________________________________________________________________________ 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): 83 - 84 H 9ACHB2,2ND ED.,1987 Decomposition point(deg C): - Heat of vaporization(deg C): --RATE CONSTANTS-- Hydrolysis (per day): 0.0067* 25 5 M 6MILES 0.489* 25 7 M 6MILES 34.657* 25 9 M 6MILES Photolysis (per day): 0.00629* WATER 25 M 6MILES 0.059* SOIL 25 M 6MILES Vapor pressure (mPa): 1.1 20 H 9ACHB2 1983 ED. 0.267* 20 M 6MILES 1.00 20 H 9ACHB2,2ND ED.,1987 Water solubility (ppm): -temp- -source- -reference- 1.30E+5* 20 M 6MILES 1.54E+5 25 H 9FACHB 1.36E+5 20 H 9FACHB Organic solubility (ppm): 5.0E+2* N-HEXANE 20 M 6MILES 6.9E+5* DICHLOROMETHANE 20 M 6MILES 1.5E+5* BENZENE 25 H 9ACHB2,2ND ED.,1987 7.5E+5* CHLOROFORM 25 H 9ACHB2,2ND ED.,1987 1.7E+5* DIETHYL ETHER 25 H 9ACHB2,2ND ED.,1986 5.2E+5* 2-PROPANOL 20 M 6MILES Henrys law (Pa m3/mol): 5.4E-07* 20 M 6MILES 1.7E-06 20 R 9HRLCP 2.2E-11 NR R 9RCFAS, p.3,1980 Octanol/water partitioning (log Kow): .431 20 M 6MILES .48 NR R 9HRLCP;KENAGA&GORING,1988 0.43* 20 Acid dissociation (pKa): Soil sorption: soiltype temp. Kd Koc %om pH reference 6.0 EESADV, 4:31,1980 7 9CRFAS, p.3,1980 6 EESADV 2 8GLEAM SANDY LOAM 0.25 30.7 1.4 6.4 6MILES SANDY LOAM 0.08 9.8 1.4 6.4 6MILES SILT LOAM 0.40 38.2 1.8 5.5 6MILES SILT LOAM 0.35 33.4 1.8 5.5 6MILES SILT LOAM 0.51 19.1 4.6 5.4 6MILES SILT LOAM 0.58 21.7 4.6 5.4 6MILES SILT LOAM 24 0.15 9.72** 2.9 5.9 6MILES SANDY LOAM 24 0.11 18.47** 1.1 6.6 6MILES SAND 24 0.04 7.89** 1.0 4.3 6MILES CLAY LOAM 24 0.01 1.22** 2.2 6.4 6MILES 15* Field Dissipation halflife(days): value test area pH source reference 2.2 CA(CHUALAR)LMY SND 7.3 M 6MILES <1 CA(FRESNO) 7.8 M 6MILES 1.5* Halflife in soil: Soiltype aerobic anaerobic source reference SANDY LOAM 6.4* 1.8* 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 KOC=15(2-38)