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-Vaoor p -rressure (at <br /> �20 C) 195.2 28.4 - 6.6 X9.5 <br /> [mm Hgl <br /> Speci <br /> (at cis 0.8802 0.8610 0.8787 0.8669 ---- --10.8642 - - -i 0.8670 <br /> - - <br /> fic density <br /> Octanol-water � <br /> partition coeff. (at <br /> 20 C) 12.13 12.69 3.20 12.77 3.15 3.15 <br /> [log Kow] 1 <br /> Henry's law <br /> constant(at 25 C) 0.55 0.67 10.70 0.50 0.71 0.80 <br /> [kPa*m3/mole] <br /> Non- <br /> Polarity Non- Non-polar Non-polar Non-polar Non- Non-polar <br /> polar polar <br /> Biodegradability Aerobic ;Anaerobic/Aerobic Aerobic Aerobic Aerobic Aerobic <br /> Maximum I - <br /> Contaminant 0.005 1 10 * 10 * 10 * 0.7 <br /> Level(MCL) <br /> [mg/1l <br /> The Environmental Protection Agency(EPA)lists an MCL of total xylenes of 10 mg/1 [8]. <br /> Table 5 summarizes the physical and chemical properties of BTEX, MTBE and other gasoline <br /> components <br /> Page 22 of 27 <br />