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PID Detection3 <br /> Sensitivity <br /> (Dsi) <br /> lb-mol detected ** Apparent benzene detected <br /> Hydrocarbon 1b-mol actual Nb; <br /> n-parafins 0.098 0.0118 <br /> iso s <br /> cycloparaffins 0.128 0.0563 <br /> mono-olefins 0.822 0.0822 <br /> aromatics 1.08 0.3672 <br /> Gasoline 0.5175 <br /> ** The sensitivities are based on an average from each hydro- <br /> carbon group using volame fractions for the various compo- <br /> nents to arrive at a representative number. <br /> IV. Molar Ratio of Gasoline to Benzene (Rgb) <br /> Rgb 1 lb-mole gasoline <br /> .5175 lb--mole benzene apparent 1.93 <br /> V. Conversion factor: PID reading to gasoline basis <br /> F Z Rgb ° MWg ° Fa ° T/MWa <br /> where. F = conversion factor <br /> Z = unit conversaion 10-6 lb mole benz/lb mole air <br /> Ppm <br /> Rgb = molar ratio of gasoline to benzene <br /> 1.93 lb-mole qasoline <br /> lb-mole benzene apparent <br /> MWg = molecular weight of gasoline z 96 lb/lb-mole <br /> Pa density of air = 0.074 lb/f t3 <br /> MWa molecular weight of air = 29 lb/lb-mole <br /> T - time conversion factor = 1440 min/day <br /> F (10-6) (1.93) (96) (0.074) (1440)/29 <br /> F R 6.8 x 10-4 (lb asoline) (min) <br /> (ftJ air) (day) ppm) <br />