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7 8 9 Maximum holdmg time IS 24 hours when sulftde IS present OptlOnally, all samples may be tested wtth lead acetate paper before the pH adjustment m order to determme If sulftde IS present If sulfide IS present, H can be removed by the addition of cadmlUm mtrate powder until a negative spot test IS obtamed The sample IS ftltered and then NaOH IS added to pH 12 Sample!> should be fIltered Immediately on-SHe before addmg preservative for dissolved metals For samples flOm non-chlonnated dnnkmg water suppltes conc H 2S04 should be added to lo,\'er sample pH to less than 2 The sample should be analyzed before 14 days X.XPDF Image | Methods for Chemical Analysis of Water and Wastes
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