ARS PESTICIDE PROPERTIES last update May 1995 name:DICAMBA CASRN: 1918-00-9 molecular formula: C8H6CL2O3 molecular weight : 221.04 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): 87 - 108 M 6SANDO Decomposition point(deg C): - Heat of vaporization(deg C): --RATE CONSTANTS-- Hydrolysis (per day): STABLE* 25-35 5-9 M 6SANDO Photolysis (per day): 0.0035* SOIL 25 M 6SANDO 0.018* WATER 25 M 6SANDO 0.0138 WATER 25 M 6SANDO Vapor pressure (mPa): 1.66* M 6SANDO Water solubility (ppm): -temp- -source- -reference- 8310* 25 M 6SANDO 3.6E5*(salt) RT H 9HERBH 7.2E5*(salt) RT H 9ACHB2 7TH ED.,1977 Organic solubility (ppm): 2.6E+5* DICHLOROMETHANE 25 H 9PMED8 1.18E+6* DIOXANE 25 H 9PMED8 9.22E+5* ETHANOL 25 H 9PMED8 1.3E+5* TOLUENE 25 H 9PMED8 1.26E6 ACETONE 25 M 6SANDO 1.37E6 METHANOL 25 M 6SANDO 6.8E5 1-OCTANOL 25 M 6SANDO 5.16E5 CHLOROFORM 25 M 6SANDO 1.27E5 CS2 25 M 6SANDO 3.75E3 HEXANE 25 M 6SANDO 2.02E5 XYLENE 25 M 6SANDO Henrys law (Pa m3/mol): 4.48E-05* M 6SANDO Octanol/water partitioning (log Kow): 0.54* M 6SANDO Acid dissociation (pKa): 1.90 E JAFCAU 26:289-292,1978 1.87 25 M 6SANDO 1.9* 25 R ADCSAJ 111:55-120,1972 Soil sorption: soiltype temp. Kd Koc %om pH source reference 2 E JEVQAA 16:422-428,1987 R 9EINSP PP.23-67 0 R 8AOACA 8 C 8GLEAM 3 C 8CREAM 4 C 8SWAMD 0.4 C 8SWAMD 2 C 8SWAMD KENYON LOAM 0.16 7.27 3.7 7.1 M 6SANDO CLAY LOAM 0.10 3.45 4.9 6.9 M 6SANDO SILT LOAM 0.53 21.20 4.2 5.1 M 6SANDO SANDY LOAM 0.07 17.5 0.6 8.1 M 6SANDO LOAM 0.21 17.5 2.1 7.3 M 6SANDO 13(7-21)* Field Dissipation halflife(days): value test area pH %OM source reference 14 H 9ACHB2 1983 ED. E JEVQAA 16:422-428,1987 R 8INSFO 8 C 8GLEAM E 9EINSP PP.23-67 25 E ETOCDK 8:339-357,1989 16(8-25)* Halflife in soil: Soiltype aerobic anaerobic source reference LOAM 31 M 6SANDO SILT LOAM 19.8 M 6SANDO LOAM, CLAY LOAM 4.4 M 6SANDO 18* Comments: WATER SOLUBILITY VALUE 3.6E5 = KSALT