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6 5 Ammomum Hydroxlde, IN Dllute 70 ml ofconc NH40H to I b.ter wlth dlstl1led water 6 4 I Dllute each of the followmg volumes of stock solutlOns to 250 ml m a volumetnc flask for appropnate standards Stock SolutIon, ml 25 50 100 150 250 350 500 750 1000 CaC03, mg/l 100 200 400 600 1000 1400 2000 3000 4000 7. Procedure 7I Pretreatment 7 I I For dnnkmg waters, surface waters, sahne waters, and dl1utlOns thereof, no pretreatmentstepsarenecessary Proceedto72 7 I 2 For most wastewaters, and hlghly polluted waters, the sample must be dlgested as glven m the Atomlc AbsorptlOn Methods sectlOn of thls manual, paragraphs 4 I 3 and 4 I 4 Followmg thlS digestIon, proceed to 7 2 72 Neutrahze500m1ofsamplewlthINammomumhydroxIde(65)andnotevolumeof NH40Hused 73 Set up mamfold as shown m Flgure 1 74 Allow both colonmeter and recorder to warm up for 30 mmutes Run a basehne wIth all reagents, feedmg dlstilled water through the sample hne Adjust dark current and operatIve opemng on colonmeter to obtam stable baselme 75 Place dlstl1led water wash tubes m alternate opemngs m Sampler and set sample tlmmg at 2 5 mlnutes 76 Arrange workmg standards m Sampler m order of decreasmg concentratlOns Complete loadmg ofSampler tray wIth unknown samples 7.7 SWItch sample hne from dIstilled water to Sampler and begm analysIs 8. CalculatlOn 8 1 Prepare standard curve by plottmg peak helghts of processed standards agamst concentratlOn values Compute concentration of samples by companng sample peak heIghts wIth standard curve Correct for amount ofNH40H used m 7 2 as follows A mg/l= 50xB where; A= Vol of sample plus volume of NH40H B = ConcentratlOn from standard curve 1301-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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