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SUBSURFACE VAPOR FRACTION SYSTEM <br /> CALCULATIONS TO COWgERT PID READINGS <br /> TO GASOLINE REXOVAL RATE <br /> The following calculations demonstrate how to convert a <br /> photo-ionization (PID) reading to a gasoline mass removal rate. <br /> I. Chemical Characteristics of Gasoline <br /> Gasoline, Average2 Average2 <br /> Rydrocarbon Composition (yi) Molecular Density (Di) <br /> Type (i) (Volumetric Fraction)* Weight (MWi) (lb/ft3) <br /> n-paraffins 0.114 77 40 <br /> ISO & <br /> cycloparaffins 0.512 107 44 <br /> mono-olefins 0.090 70 38 <br /> aromatics 0.284 92 54 <br /> Gasoline 1.000 96 46 <br /> II. Molar Fraction <br /> Yi_x D; x MW <br /> g <br /> Xi = Dg x MWi <br /> where: <br /> Xi a molar fraction of hydrocarbon i (-) <br /> Yi = Volumetric fraction of hydrocarbon i (-) <br /> Di = density of hydrocarbon i (lb/ft3) <br /> Dg density of gasoline (lh/ft3) <br /> MWi = molecular weight of hydrocarbon i {-) <br /> MWg - molecular weight of gasoline {-) <br />