ARS PESTICIDE PROPERTIES DATABASE last updated Oct 1, 2001 name: 2,4,5-T ACID CASRN: 93-76-5 SELECTED VALUES FOR MODELING PURPOSES (from Hornsby, et al., 1996) WATER SOLUBILITY (mg/L): 278 FIELD HALF-LIFE (days): 30 SOIL ORGANIC CARBON SORPTION (Koc, mL/g): 80 VAPOR PRESSURE (mm Hg): 0 (pH7) pKa: 2.85 PUBLISHED AND MANUFACTURER VALUES AND SOURCES molecular formula: C8H5O3CL3 molecular weight: 255.49 physical state: S (L=liquid; G=gas; S=solid) reference: 9PMED9 __________________________________________________________________________ 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): 157-158 H 6MONTG Decomposition point (deg C): Heat of vaporization (deg C): --RATE CONSTANTS-- Hydrolysis (per day): Photolysis (per day): 0.046 H 6MONTG Vapor pressure (mPa): 0.9 20 C CMSHAF 10:833-846 7.05E-4* 20 H 9PMED9 5.0 20 H 6MONTG Water solubility (ppm): 150* 25 H 9PMED9 200 25 R 9KHBCD 1-128 (1975) 251,268,280 25 R 9KHBCD 1-128 (1975) 238 30 R 9KHBCD 1-128 (1975) 278 20 H 9ACHB2 1983 220 20 H 6MONTG Organic solubility (ppm): >5E4 ETHER,ETHANOL,METHANOL, TOLUENE 20 H 9PMED9 400 HEPTANE 20 H 9PMED9 Henrys law (Pa m3/mol): 1.2E-6 20 H 9PMED9 Octanol/water partitioning (log Kow): 0.60-3.40 H 6MONTG 2.0* Acid dissociation (pKa): 2.9 E JEVQAA 12: 325-330 (1983) 3.14,3.46 E JAFCAU 18: 814-818 (1970) 2.85* E JAFCAU 26: 189-192 (1978) Soil sorption: soiltype temp. Kd Koc %om pH reference -------- ----- -- --- --- -- --------- 95 6GERST 80 JEVQAA 16: 422-428 (1987) 110,94 6GHENT 46: 281-296 (1981) 186 6GHENT 46: 281-296 (1981) 425 JEVQAA 12: 325-330 (1983) 39,66 SSSAA8 38: 433-436 (1974) 92,123 SSSAA8 38: 433-436 (1974) 133 SSSJD4 41: 278-285 (1977) 374 SSSJD4 43: 871-874 (1979) 196 SSSJD4 43: 871-874 (1979) 91 ESTHAG 21: 358-366 (1987) SANDY LOAM 0.31 39 1.38 7.5 JEVQAA 12(2):195-7 (1983) SILTY CLAY LOAM 0.49 92 0.91` 8.5 JEVQAA 12(2):195-7 (1983) SANDY LOAM 2.40 66 6.30 6.6 JEVQAA 12(2):195-7 (1983) SILTY LOAM 3.00 124 4.18 6.5 JEVQAA 12(2):195-7 (1983) SANDY CLAY LOAM 6.20 186 5.74 JEVQAA 12(2):195-7 (1983) 80* W Field dissipation halflife(days): value test area pH source reference ----- --------- -- ------ --------- 12,19,24 R RREVAH 80: 65-135 (1981) 33 E JEVQAA 16: 422-428 14 E JAFCAU 29: 100-107 (1981) 63,69 E 6GHENT 46: 281-296 (1981) 38 R 6ENVPE pp. 257-280 14,21 R RREVAH 80: 65-135 30* W Halflife in soil: soiltype aerobic anaerobic source reference -------- ------- --------- ------ --------- Comments: