ARS PESTICIDE PROPERTIES last update May 1995 name:METHOMYL CASRN: 16752-77-5molecular formula: C5H10N2O2S molecular weight : 162.2 physical state : S (L=liquid; G=gas; S=solid) reference: 9ACHB2_________________________________________________________________________ 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): 77 M 9DUPON,1999Decomposition point(deg C): -Heat of vaporization(deg C):--RATE CONSTANTS--Hydrolysis (per day): STABLE* 25 5,7 M 9DUPON,1999 0.014 25 9 M 9DUPON,1999Photolysis (per day): 0.020*(1.4%OM) SOIL 26 6.8 M 9DUPON 0.14* WATER 25 5 M 9DUPONVapor pressure (mPa): 0.75 25 M 9DUPON,1999 Water solubility (ppm): -temp- -source- -reference- 5.8E+4 25 7 M 9DUPON,1999 Organic solubility (ppm):Henrys law (Pa m3/mol): 2.0E-6* 25 M 9DUPONOctanol/water partitioning (log Kow): 0.57 25 M 9DUPON,1999Acid dissociation (pKa): Soil sorption: soiltype temp. Kd Koc %om pH source reference SNDY LM(MD) 25 0.72 59 2.1 6.5 M 9DUPON SLT LM(IL) 25 1.0 40 4.3 5.4 M 9DUPON,1999 SLT LM(DE) 25 1.4 32 7.5 5.2 M 9DUPON SNDY LM(DE) 25 9.23 36 1.1 6.6 M 9DUPON,1999Field Dissipation halflife(days): value test area pH %OM source reference >42 CA P 8EPAGR 45 P 8EPAGR 8 C 8GLEAM <30-42 P 8KAUGW <30 P 8EPAGR CA.5 M 9DUPON 28(5-54)* 5-10 DE 5 M 9DUPON 54 CA 7.9 M 9DUPONHalflife in soil: Soiltype aerobic anaerobic source reference 30* SNDY LM(DE) 14-21 M 9DUPON SLT LM(IL) 42 M 9DUPON LOAM(CA) 12 M 9DUPON,1999 SILT LM(DE) 42 M 9DUPON,1999Comments: SOIL SORPTION KOC VALUE=86(9-160); AEROBIC=30(14-62) PH6.2