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MMSIIR_pAGE VAPOR E"PLACTION lSISTEH <br /> CA =LATIOSS TO COST PID READINGS <br /> TO GASOLINE RINOVAL RATG <br /> 'The Following calculations demonstrate haw to convert a <br /> photo-ionization (PID) reading to a gasoline mass removal rate. <br /> I. Chemical Characteristics of Gasoline <br /> Gasolinel Average2 Average2 <br /> Hydrocarbon Composition (yi) Molecular Density (Di) <br /> Type (i) (Volumetric rraction)x Weight (MWi) (lb/ft3) <br /> n-paraffins 0.114 77 40 <br /> ISO i <br /> cycloparaffins 0.512 107 44 <br /> iftnno-olefins 0.090 70 38 <br /> aromatics 0.284 92 54 <br /> Gasoline 2.000 96 46 <br /> II. Molar Fraction <br /> xDix�g <br /> Xi Dg R MWi <br /> where: <br /> Xi R molar fraction of hydrocarbon i {«} <br /> DY <br /> Volumetric fraction of hydrocarbon i {-) <br /> Ddensity of hydrocarbon i (lb/ft3) <br /> Dg density of gasoline (lb/ft3) <br /> pSWi . molecular weight of hydrocarbon i (- } <br /> xw, = molecular weight of gasoline (-) <br />