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I I I I I I 10 QualIty Control For DnnkIng Water AnalysIs I 101 Mimmumreqmrements : 1011 All qualIty control data should be maIntaIned and avaIlable for easy 10 2 10 3 reference or InSpectIon I 1012 An unknown performance sample (when avaIlable) must be analyzed once per year for the metals measure4 Results must be wIthIn the control lImIt establIshed by EPA If problerrls anse, they should be corrected, and a follow-up performance sample shbuld be analyzed Mimmum Dally control I 1021 After a calIbratlOn curve compo~ed of a mInImUm of a reagent blank and three standards has been preparfd, subsequent calIbratlOn curves must be verlfied by use of at least a reag?nt blank and one standard at or near the MCL DallychecksmustbewIthl!n ±10percentofongInalcurve 1022 If20 or more samples per day are ~nalyzed,the workIng standard curve must be verlfied by runmng an addItlO;nal standard at or near the MCL every 20 samples ChecksmustbewIthIn :L10percentoforIgInalcurve OptlOnal Reqmrements I 1031 A current serVIce contract shoul;d be In effect on balances and the atomIC absorptlOn spectrophotometer i 1032 Class S weIghts should be avallabU:l to make penodic checks on balances I 1033 ChemIcals should be dated upon J-ecelpt of shIpment and replaced as needed or before shelflIfe has been excee~ed 1034 A known reference sample (when avaIlable) should be analyzed once per quarter for the metals measured :The measured value should be wIthIn the control lImIts establIshed by EP A I I 1035 At least one duplIcate sample should be run every 10 samples, or wIth each I set of samples to venfy preCIsIon of the method Checks should be wIthIn the controllImItestablIshedbyEPA i 1036 Standard devlatlOn should bl( obtaIned and documented for all measurements beIng conducted I 1037 QualIty Control charts or a tab;ulation of mean and standard devlatlOn should be used to document vahdI1ry ofdata on a dally basIs MET ALS-19PDF Image | Methods for Chemical Analysis of Water and Wastes
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