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I"ROLEUM CONTAMINATED SOILS MODELING PETROLEUM IN SOILS 69 r <br /> fresn diesel fuel 1 <br /> C1? C14 C16 pri srane b <br /> C 7 <br /> 18 <br /> phytane <br /> n-pentane <br /> C 1 A C20 <br /> n-hexane <br /> benzene <br /> C <br /> C1[ C16r 1.7prisi-.anr after 3 months <br /> +.oluene <br /> C1 /phytane <br /> z <br /> I� <br /> ethyl benzene <br /> o-x lene m-. p-xylenes Cyn 'y <br /> Y <br /> FI <br /> substituted benzenes <br /> I'l <br /> naphthalene <br /> after 6 months <br /> h <br /> I' <br /> I <br /> i <br /> JJ� <br /> i <br /> 8 ' <br /> lil <br /> r; <br /> Figure 4. Specimen gas chromatograms of fresh diesel fuel,and weathered samples show- <br /> of the more soluble monoaromatics. <br /> Gas chromatogram of the water soluble fraction of a crude oil showing dominance ing change in n-alkane to isoprenoid ratio and emergence of the "hump." ; <br /> Source: Kostecki and Calabrese "Petroleum Contaminated Soils,", 1989. <br />