ARS PESTICIDE PROPERTIES DATABASE last updated Oct 1, 2001 name: ATRAZINE CASRN: 1912-24-9 SELECTED VALUES FOR MODELING PURPOSES (from Hornsby, et al., 1996) WATER SOLUBILITY (mg/L): 33 FIELD HALF-LIFE (days): 60 SOIL ORGANIC CARBON SORPTION (Koc, mL/g): 100 VAPOR PRESSURE (mm Hg): 2.89 x 10-7 pKb: 12.32 PUBLISHED AND MANUFACTURER VALUES AND SOURCES molecular formula: C8H14CLN5 molecular weight : 215.68 physical state : S (L=liquid; G=gas; S=solid) reference: 9MERCK(10),0.125,1983 _________________________________________________________________________ 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): 175 - 177 M 9CIBAG Decomposition point(deg C): - Heat of vaporization(deg C): --RATE CONSTANTS-- Hydrolysis (per day): STABLE* 25 5,7,9 M 9CIBAG Photolysis (per day): 0.015 SOIL** 25 M 9CIBAG 0.951 WATER** 25 7 M 9CIBAG 0.002 WATER*** 12-44 7 M 9CIBAG Vapor pressure (mPa): 0.04 20 H 9HERBH,5TH ED.,p.31,1983 0.0076 10 H 9HERBH,5TH ED.,p.31,1983 0.187 30 H 9HERBH,5TH ED.,p.31,1983 3.07 50 H 9HERBH,5TH ED.,p.31,1983 0.038* 25 M 9CIBAG Water solubility (ppm): -temp- -source- -reference- 320 85 M 9TDCGB, p.1,1977 29.9 25 R 9SVPGW, p.72,1976 52 E ETOCDK,8:339-357,1989 34.2 R 9SVPGW, p.72,1976 30 20 E PSSCBG, 12:222,1981 33* 22 E 9CIBAG 33 20-25 R ADCSAJ, 111:72,1972 33 25 E WEREAT, 12:200,1972 Organic solubility (ppm): 1.2E+4* ETHER 25 H 9MERCK, 10:125(1983) 5.2E+049* CHLOROFORM 25 H 9MERCK, 10:125,1983 1.8E+4* METHANOL 25 H 9MERCK, 10:125,1983 1.8E+5* DIMETHYL SULFOXIDE 27 H 9HERBH, 5:31(1983) 2.8E+4* ETHYL ACETATE 27 H 9HERBH, 5:31,(1983) 3.6E+2* N-PENTANE 27 H 9HERBH, 5:31,1983 Henrys law (Pa m3/mol): 2.48E-4* 25 M 9CIBAG Octanol/water partitioning (log Kow): 2.68* 25 M 9CIBAG 2.34 R 9EINSP, p.43,1980 2.80 U 9IUPC4, 4:34,1983 2.69 E CMSHAF, 13:275,1984 2.71 E JEVQAA, 10(3):384,1981 2.52 E PSSCBG, 12:219,1981 2.61 E JAFCAU, 34:725,1986 2.60 R 9HLMCP, 1981 Acid dissociation (pKa): 1.70 21 R 9KHBCD,2nd ed.,p.131,1974 1.68* 22 E SSSAA8, 32:224,1968 Soil sorption: soiltype temp. Kd Koc %om pH reference 148 EESADV, 4:28,1980 288 JPFCD2, VB22(1):67,1987 214 JEVQAA,V10(3):384,1981 149 8SWAMD 163 8SWAMD 111 8SWAMD 170 8ABACA 163 9EINSP PP.23-67 160 JEVQAA 16:422-428,1987 127 8CREAM 107 ETOCDK 8:339-357,1989 174 JPFCD2 22:55-69,1987 88 9CIBAG 38 9CIBAG 72 9CIBAG 157 9CIBAG 102 8SWAMD SAND 0.42 90 0.8 5.6 9CIBAG SANDY LOAM 0.99 57 3.0 6.1 9CIBAG SILT LOAM 1.46 120 2.1 7.0 9CIBAG LOAM 2.03 139 2.5 6.6 9CIBAG LOAM 0.73 155 0.8 CLAY 2.46 87 4.8 SAND 0.2 39 0.9 SANDY LOAM 0.75 70 1.92.1 147* Field Dissipation halflife(days): value test area pH source reference 173(13-402)* M 9CIBAG 42-70 H 9ACHB2 1983 ED. 48 R 9EINSP PP.23-67 64 E JEVQAA 16:422-428,1987 18 C 8GLEAM 74 E ETOCDK 8:339-357,1989 119 M 9CIBAG Halflife in soil: Soiltype aerobic anaerobic source reference SANDY LOAM 330 15 M 9CIBAG 146* 77* M 9CIBAG Comments: PHOTOLYSIS: ** ARTIFICIAL LIGHT; ***NATURAL LIGHT