listing of ECOTOX plus studies listed as fate related and salient monitoring studies are summarized in APPENDIX 1-10. Table 3-1. Chemical properties and environmental fate parameters for malathion and degradates with registrant submitted data. Malaoxon Dicarboxylic Property Malathion acid acid Diethyl Diethyl IUPAC Name ester butanedioc butanedioc acid acid Structure Chemical Formula C10H19O6PS2 C10H19O7PS C8H15O6PS2 C6H11O6PS2 Molecular Mass 330.3 g/mol 314.3 g/mol 302.3 g/mol 274.3 g/mol 3.4*10-6 - 4.5*10-6 Vapor Pressure (25°C) 2.3*10-5 torr1 torr2 8.4*10-10 - 4.7*10-15 8.4*10-10 Law Constant atm∙m3/mol2 atm∙m3/mol2 2 Solubility (25°C) 145 ppm1 78 ppm2 - 3218 ppm2 pH 5: 107 days pH 5: 32 days - - Hydrolysis half-life (25°C) pH 7: 6 days pH 7: 9 days pH 9: 0.5 day1 pH 9: 0.16 day1 Aqueous photolysis half-life 98 days at pH 41 - - - Soil photolysis half-life (days) 173 days1 - - - Aerobic soil metabolism <1 day1 - - 0.3 to 11 days1 range Aerobic aquatic metabolism 0.8 to 6 days1 - - 0.5 to 10 days1 half-life Anaerobic aquatic - - - 2.5 metabolism half-life range Soil partition (adsorption) 151-308 mL/g 81 327 mL/g - 7 76 mL/g – – coefficients (Koc) o.c. 1 o.c. 1 o.c.1 Terrestrial field dissipation - - - <1 day1 DT50 Octanol-water partition 32 5622 72 195-20001 coefficient (Kow) 4.2 to 18L/kg - - 3.2 L/kg Bioconcentration factor wet-wt1 Derived from registrant submitted study Derived from EPISuite
listing of ECOTOX plus studies listed as fate related and salient monitoring studies are summarized in APPENDIX 1-10. Table 3-1. Chemical properties and environmental fate parameters for malathion and degradates with registrant submitted data. Property Malathion Malaoxon acid Dicarboxylic acid IUPAC Name Diethyl Diethyl ester butanedioc acid butanedioc acid Structure Chemical Formula C10H19O6PS2 C10H19O7PS C8H15O6PS2 C6H11O6PS2 Molecular Mass 330.3 g/mol 314.3 g/mol 302.3 g/mol 274.3 g/mol Vapor Pressure (25°C) 2.3*10-5 torr1 3.4*10-6 - 4.5*10-6 torr2 Law Constant 8.4*10-10 atm∙m3/mol2 8.4*10-10 atm∙m3/mol2 - 4.7*10-15 Solubility (25°C) 145 ppm1 78 ppm2 - 3218 ppm2 Hydrolysis half-life (25°C) pH 5: 107 days pH 7: 6 days pH 9: 0.5 day1 pH 5: 32 days pH 7: 9 days pH 9: 0.16 day1 - - Aqueous photolysis half-life 98 days at pH 41 - - - Soil photolysis half-life (days) 173 days1 - - - Aerobic soil metabolism range 0.3 to 11 days1 <1 day1 - - Aerobic aquatic metabolism half-life 0.5 to 10 days1 0.8 to 6 days1 - - Anaerobic aquatic metabolism half-life range 2.5 - - - Soil partition (adsorption) coefficients (Koc) 151-308 mL/g o.c. 1 81 – 327 mL/g o.c. 1 - 7 – 76 mL/g o.c.1 Terrestrial field dissipation DT50 <1 day1 - - - Octanol-water partition coefficient (Kow) 195-20001 32 5622 72 Bioconcentration factor 4.2 to 18L/kg wet-wt1 - - 3.2 L/kg Derived from registrant submitted study Derived from EPISuite 2
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