ARS PESTICIDE PROPERTIES DATABASE last updated May 1995 name: DICHLORVOS(DDVP) CASRN: 62-73-7 molecular formula: C4H7CL2O4P molecular weight: 221 physical state: L (L=liquid; G=gas; S=solid) reference: 9PME10 __________________________________________________________________________ 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): 120 AT 14 MM HG H 6MONTG Melting point (deg C): Decomposition point (deg C): Heat of vaporization (deg C): --RATE CONSTANTS-- Hydrolysis (per day): 2.16 7 H 6MONTG 33.26 8 H 6MONTG 0.022** 4 H 9PME10 0.239** 7 H 9PME10 0.347** 9 H 9PME10 Photolysis (per day): 2.295 H 9MONTG Vapor pressure (mPa): 2100 25 H 9PME10 1600* 20 E PSSCAG 4: 137-147 (1973) 4260 32 P 6EPAPF vol. II Water solubility (ppm): 8000* 20 H 9PME10 10000 20 H 9ACHB2 1983 Organic solubility (ppm): MISCIBLE WITH MANY ORGANIC SOLV. H 9PME10 Henrys law (Pa m3/mol): 0.044 20 H 9PME10 20 E PSSCAG 4: 137-147 (1973) Octanol/water partitioning (log Kow): 1.9 H 9PME10 1.423 H 9PME10 1.40-2.29 H 6MONTG Acid dissociation (pKa): Soil sorption: soiltype temp. Kd Koc %om pH reference -------- ----- -- --- --- -- --------- 27.5 RREVAH 103: 1-59 (1988) 151 9EINSP pp. 23-67 (1980) 50* 6M0NTG Field dissipation halflife(days): value test area pH source reference ----- --------- -- ------ --------- 0.08-0.33 P 6EPAPF vol. II 0.19 PH 9.1 E 6EXTOX 2 PH 1 R 6EXTOX 2 PH 4.7 E 6GHENT 49/3B:1231-239(1984) <1 PH 4.1 E 6GHENT 49/3B:1231-239(1984) <1 E JAFCAU 16: 598-601 (1968) 0.5* W Halflife in soil: soiltype aerobic anaerobic source reference -------- ------- --------- ------ --------- Comments: