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t <br /> FID Detectibn3 <br /> Sensitivity <br /> (Dsi) <br /> lb-mol detected +* Apparent benzene detected <br /> ffydrocarbon b-mol actual 'Nb; <br /> a-parafins 0.098 0,0118 <br /> Iso s <br /> cyclopareffins 0.128 0.0563 <br /> sono-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 1 lb-mole gasoline <br /> .5175 lb-mole benzene apparent 1.93 <br /> V. Conversion factor: PID reading to gasoline basis <br /> P Z ° Rgb ° MWg ° Pa ° T/MWa <br /> where: F conversion factor <br /> Z = unit conversaion 10-6 lb mole bent/lb mole air <br /> PPM <br /> Rgb - molar ratio of gasoline to benzene <br /> - 1.93 lb-mole gasoline <br /> Zb-mole benzene apparent <br /> FSWg molecular weight of gasoline 96 lb/lb-mole <br /> Pa density of air 0.074 lb/ft3 <br /> xw, - molecular weight of air - 29 lb/lb-mole <br /> T time conversion factor 1440 gain/day <br /> F . (10"6) (1.93) (96) (0.074)(1440)/29 <br /> P 6.6 s 10-4 (lb asoline) (min) <br /> t air day PPM <br /> t <br /> OEM <br />