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Xylenes are composed of three isomers with similar properties According to reference no 4, all three isomers may occur in approximately equal amounts in a gasoline when sold Therefore, average chemical properties were calculated and input to SESOTL Water Solubility 1 175 mg/l - 1,2-Xylene (page 505 of ref 4) 146 mg/l - 1,3-Xylene (page 516 of ref 4) 156 mg/1 - 1,4-Xylene (page 526 of ref. 4) average = 159 mg/l Henry's Law Constant I 5.1 x 10-3 atm-m3/mole - 1,2-Xylene (page 505 of ref 4) 7 7 x 10-3 atm-m3/mole - 1,3-Xylene (page 516 of ref 4) 7 7 x 10-3 atm-m3/mole - 1,4-Xylene (page 526 of ref 4) 1 _ average = 6 8 x 10-3 atm-m3/mole l Molecular Weight r 106 16 grams/mole - 1,2-Xylene (page 505 of ref 4) 106 17 grams/mole - 1,3-Xylene (page 516 of ref 4) 106 17 grams/mole - 1,4-Xylene (page 526 of ref. 4) Laverage = 106 17 grams/mole Diffusion Coefficient in air Xylene's molecular diffusion coefficient in air of 0 43 m2/day (0 050 cm2/sec) is reported in the caption to Figure 15 2 11 of reference no 3 Air diffusion plays a Iminor transportation role compared to infiltration transport. Organic Carbon Partitioning Coefficients, Koc I I Reference no, 3, Table 15 2 5, page 15 2 5 lists a Koc of 830 L/kg for o-Xylene (1,2- Xylene) Values for the other xylene isomers are not given in reference no 3 but reference no 2 reports 692 cc/g for all three isomers The more conservative value of 692 cc/g is specified According to the Handbook-of Hydrology_(1993), the rate of-biodegradation-is determined by_ _ - the number and type of microorganisms present, the toxicity of the parent compound or its daughter products to the microorganism population, the water content and temperature of the Isoil, the presence of electron acceptors and the oxidation-reduction potential, the soil pH, the w 1943681reports\sesod doc 9 IL . SMTH I �