ARS PESTICIDE PROPERTIES last update May 1995 name:PICLORAM CASRN: 1918-02-1 molecular formula: C6H3CL3N2O2 molecular weight : 241.48 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): 215 - H 9ACHB2 Decomposition point(deg C): - Heat of vaporization(deg C): --RATE CONSTANTS-- Hydrolysis (per day): STABLE* 25 5-9 M 6DOWCH Photolysis (per day): 0.26* WATER 25 M 6DOWCH Vapor pressure (mPa): 0.08 35 H 8HERBH H 9ACHB2 1983 ED. 0.15 45 H 9HERBH 0.06* 20 R 9HRLCP 10.6 25 M 6DOWCH Water solubility (ppm): -temp- -source- -reference- 430* (pH2.5) 25 E JAFCAU 28:95-97,1980 E ETOCDK 8:339-357,1989 4E05(SALT) 25 H 9ACHB2 7TH ED.,1977 8.11E5(SALT,pH6) E JAFCAU 28:95-97,1980 Organic solubility (ppm): 1.98E04* ACETONE H 9PMED8 600* DICHLOROMETHANE H 9PMED8 5.5E03* 2-PROPANOL H 9PMED8 Henrys law (Pa m3/mol): 3.37E-05* Octanol/water partitioning (log Kow): -0.05* (pH5-9) M 6DOWCH Acid dissociation (pKa): 1.9* 25 R ADCSAJ 111:55-120,1972 2.0 25 M 6DOWCH 2.0 25 E JAFCAU 28:89-92,1980 Soil sorption: soiltype temp. Kd Koc %om pH reference 26 9EINSP PP.23-67 ETOCDK 8:339-357,1989 SCSFAD 44:1-8,1985 48 JEFQAA 16:422-428,1987 20 8GLEAM 16 8CREAM 17 JPFCD2 22:55-69,1987 EESADV 7-40 8EPAHO 29* 22 6DOWCH Field Dissipation halflife(days): value test area pH source reference 60-120 H 9ACHB2 1983 ED. 138 E SCSFAD 44:1-8,1985 R 9EINSP PP.23-67 100 E JEVQAA 16:422-428,1987 138 R 9EINSP PP.23-67 8600 R 9EINSP PP.23-67 31 R 9EINSP PP.23-67 30 C 8GLEAM 206 E ETOCDK 8:339-357,1989 116 R 8INSFO 50-200 R 8OUSSD 108(31-206)* Halflife in soil: Soiltype aerobic ppm anaerobic source reference 18 0.0025 M 6DOWCH 29 0.025 M 6DOWCH 150 0.25 M 6DOWCH 300 2.5 M 6DOWCH Comments: WATER SOLUBILITY 4E05 @25C = PICLORAM-POTASSIUM SOIL SORPTION KOC VALUE=29(7-48);SOIL HLIFE IS A FUNCTION OF CONCENTRATION(E.G. APPL. RATE 0.0025PPM, HALFILE=18D; APPL. RATE 2.5PPM, HALFLIFE=300D