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7. Procedure 71 NoadvancesamplepreparatIonISreqUIred SetupmamfoldasshownmFIgure1 72 Allow both colonmeter and recorder to warm up for 30 mmutes Run a baselme wIth all reagents, feedmg dIstIlled water through the sample lme Adjust dark current and operatIve openmg on colonmeter to obtam stable baselme 73 Place dIstIlled water wash tubes m alternate opemngs on sampler and set sample tImmg at20mmutes 74 Place workmg standards m sampler m order of decreasmg concentratlOn Complete fillmg ofsampler tray wIth unknown samples 75 SWItch sample lme from dIstIlled water to sampler and begm analysIs Calculation 8.1 Prepare standard curve by plottmg peak heIghts of processed standards agamst known concentratlOns Compute concentratlOn of samples by companng sample peak heIghts wIth standard curve PreCIsIon and Accuracy 9 1 In a smgle laboratory (EMSL), usmg surface water samples at concentratlOns of 15,57, 154, and 193 mg/l as CaC03 the standard devIatIOn was ±O 5 9.2 In a smgle laboratory (EMSL), usmg surface water samples at concentratIons of 31 and 149 mg/l as CaC03 recovenes were 100% and 99%, respectIvely BIblIography Techmcon Auto Analyzer Methodology, Bulletm 1261, Techmcon Controls, Inc, Chauncey, NY (1961) Standard Methods for the ExammatIOn of Water and Wastewater, 14th EdItion, p 278, Method 403 (1975) 8. 9 1 2. 6 4 1 Prepare a senes ofstandards by dilutmg sUItable volumes ofstock solutlOn to 100 0 ml wIth dIStilled water The followmg dIlutIons are suggested ml of Stoek SolutIOn 10 20 40 60 80 100 180 200 Cone, mg/l as CaC03 10 20 40 60 80 100 180 200 3102-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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