ARS PESTICIDE PROPERTIES DATABASE last updated Oct 1, 2001 name: AZINPHOS-METHYL CASRN: 86-50-0 SELECTED VALUES FOR MODELING PURPOSES (from Hornsby, et al., 1996) WATER SOLUBILITY (mg/L): 29 FIELD HALF-LIFE (days): 10 SOIL ORGANIC CARBON SORPTION (Koc, mL/g): 1000 VAPOR PRESSURE (mm Hg): 2 x 10-7 PUBLISHED AND MANUFACTURER VALUES AND SOURCES molecular formula: C10H12N3O3PS2 molecular weight : 317.33 physical state : S (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): - Melting point(deg C): 73 - 74 H 9PMED8,8TH ED.,p.41,1987 Decomposition point(deg C): - Heat of vaporization(deg C): --RATE CONSTANTS-- Hydrolysis (per day): 0.0164* 30 4 M 6MILES 0.0275* 30 7 M 6MILES 0.2773* 30 9 M 6MILES Photolysis (per day): 0.217* WATER 25(17-29)OD M 6MILES 0.007* SOIL OD M 6MILES Vapor pressure (mPa): 2.7E-2 20 R 9HRLCP 2.13E-1* 20 M 6MILES Water solubility (ppm): -temp- -source- -reference- 28.0* 20 M 6MILES 33 20 H 9PMED8,8TH ED.,p.41,1987 29 25 H 9ACHB2,2ND ED.,1987 20.9 20 E JPFCD2,VB18(2):224,1983 9.5 10 E JPFCD2,VB20(6):627,1985 43.6 30 E JPFCD2,VB20(6):627,1985 34 R JAFCAU 18:814-818, 1970 Organic solubility (ppm): 1.0E+3 2-PROPANOL LOW 20 M 6MILES 1.0E+4 2-PROPANOL 20 M 6MILES >1.0E+6* DICHLOROMETHANE 20 M 6MILES 1.0E+5 TOLUENE LV 20 M 6MILES 1.0E+6 TOLUENE HV 20 M 6MILES Henrys law (Pa m3/mol): 2.4E-3* 20 M 6MILES 3.2E-3 20 R 9HRLCP Octanol/water partitioning (log Kow): 2.56 LV 20 M 6MILES 2.96 HV 20 M 6MILES 2.69 NR R 9HRLCP(BOWMAN&SANS)1983 2.8* 20 Acid dissociation (pKa): Soil sorption: soiltype temp. Kd Koc %om pH reference SILT LOAM 11.0 1051 1.8 5.5 6MILES 700 8GLEAM 500 8CREAM LOAMY SAND 7.6 467 2.8 6.6 6MILES SILT LOAM 16.8 578 5.0 7.9 6MILES CLAY LOAM 9.9 3406 0.5 6.0 6MILES SANDY LOAM 3.3 298 1.9 6.4 6MILES SILT LOAM 28.5 1064 4.6 5.4 6MILES SILT LOAM 24 12.68 829** 2.9 5.9 6MILES SANDY LOAM 24 4.02 693** 1.1 6.6 6MILES SAND 24 6.79 1282** 1.0 4.3 6MILES CLAY LOAM 24 8.39 723** 2.2 6.4 6MILES 940* Field Dissipation halflife(days): value test area pH source reference 10 SOIL 11-78 M 6MILES 10(5.3-15)* 15 C 8GLEAM 10.9 CA(CHUALAR)LMY SND 7.3 M 6MILES 5.3 CA(FRESNO)LMY SND 7.8 M 6MILES Halflife in soil: Soiltype aerobic anaerobic source reference SANDY LOAM 44* 68 M 6MILES Comments: SOIL SORPTION VALUES WITH A DOUBLE ASTERISK WERE CALCULATED USING A CONVERSION FACTOR OF 1.9(%OM=1.9%OC) RATHER THAN 1.72. SELECTED KOC 940=940(298-3406).