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65 Stock solution DIs!>olve 14790 g of oven-dned (105°C) Na2S04 m dIstIlled water and dIluteto 1lItermavolumetrIcflask 10 ml = 10mg 6 5 1 Prepare a senes of standards by dIlutmg smtable volumes of stock solutIOn to 100 0 ml WIth dIstIlled water The followmg dIlutIOns are suggested ml of Stock SolutIOn 10 20 40 60 80 100 150 200 300 400 Cone, mg/l 10 20 40 60 80 100 150 200 300 400 7. Procedure 7.1 Set up mamfold as shown m FIgure 1 (Note that any preCIpItated BaS04and the unused banum chloramlate are removed by filtratIon If any BaS04 should come through the filter, It IS complexed by the NaOH-EDT A reagent) 72 Allow both colonmeter and recorder to warm up for 30 mmutes Run a baselIne WIth all reagents, feedmg dIstIlled water through the sample lme Adjust dark current and operatlve opemng on colonmeter to obtam smtable baselIne 73 Place dIstIlled water wash tubes m alternate opemngs m sampler and set sample tImmg at 20mmutes 74 Place workmg standards In sampler m order of decreasmg concentratIOn Complete fillmg ofsampler tray WIth unknown samples 75 SWItch sample lIne from dIstIlled water to sampler and begm analysIs 8. CalculatIon 8 1 Prepare standard curve by plottmg peak heIghts of processed standards agamst known concentratIOns Compute concentratIon of samples by companng sample peak heIghts WIth standard curve 9. PreCIsIon and Accuracy 9.1 In a smgle laboratory (EMSL), usmg surface water samples at concentratIOns of39, 111, 188 and 294 mg S04/1, the standard deVIatIons were ±O6, ±10, ±22 and ±O8, respectIvely _ 92 In a smgle laboratory (EMSL), usmg surface water samples at concentratIOns of 82 and 295 mg S04/1, recoverIes were 99% and 102%, respectIvely BiblIography 1 Barney, J E, and BertolocmI, R J , Anal Chern, 29, 283 (1957) 2 Gales, M E , Jr, Kaylor, W H and Longbottom, J E, "DetermmatIOn of Sulphate by Automatlc ColorImetnc AnalYSIS", Analyst, 93, 97 (1968) 375 1-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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