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w <br /> r• - <br /> 3 <br /> 1 <br /> PID Detection3 <br /> Sensitivity <br /> (D5i) <br /> lb-mol detected ** Apparent benzene detected <br /> hydrocarbon lb-mol actual Nb; <br /> n-parafins 0.098 0.0118 <br /> iso & <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 volume fractions for the various compo- <br /> nents to arrive at a representative number. <br /> IV. Molar Ratio of Gasoline to Benzene (Rgb) <br /> Rgb C 1 lb-mole gasoline <br /> .5175 lb-mole benzene apparent = 1.93 <br /> V. Conversionfactor: PID reading to gasoline basis <br /> F Z ° Rgb ° MWg ° Pa ° 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 aasol_ine_ <br /> lb-mole benzene apparent <br /> MWg - molecular weight of gasoline = 96 lb/lb-mole <br /> Pa = density of air - 0.074 lb/ft3 <br /> KWa - molecular weight of air = 29 lb/lb-mole <br /> T = time conversion factor = 1440 min/day <br /> Ir _ (10-6) (1.93) (96) (0.074) (1440)/29 <br /> F 6.8 x 10-4 (lb asoline) (min) <br /> TTP' air) (day) (Ppm) <br /> �r <br />