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8 7 10 CalculatIOns 9 PrecIsion and Accuracy 9 1 PreCISIOn and accuracy data are not avalIable at thiS time 7 8 Select appropnate workmg standards and cell pathlength accordmg to the followmg table of approximate workmg ranges 79 Cahbrate the mstrument for the appropnate cells usmg a senes of workmg standards (653) It IS not necessary to add slIlCa gel to the standards Determme absorbance 1 directly for each solutIOn at the absorbance maximum at about 2930 cm- Prepare a cahbratlOnplotofabsorbancevs mgpetroleumhydrocarbonsper100mlsolutIOn After the slhca gel has settled m the sample extract, fill a clean cell With solutIOn and determme the absorbance of the extract If the absorbance exceeds 0 8 prepare an appropnate dlIution NOTE 2: The posslblhty that the absorptive capacity ofthe s1I1ca gel has been exceeded can be tested at thiS pomt by addmg another 3 0 g slhca gel to the extract and repeatmg the treatment and determmatlon Determme the concentratIOn of petroleum hydrocarbons m the extract by companng the response agamst the cahbratlOn plot 8 1 Calculate the petroleum hydrocarbons m the sample usmg the formula mg/l Petroleum Hydrocarbons = V where R = D = V = mg ofPetroleum Hydrocarbons as determmed from the cahbratwn plot (7 10) extract dlIutwn factor, Ifused volume ofsample, m hters Path1ength 10 mm 50 mm 100 mm Range 2-40 mg 05-8 mg 01-4 mg RxD 418 1-3PDF Image | Methods for Chemical Analysis of Water and Wastes
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