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1 2 3 CHLORINE, TOTAL RESIDUAL Method 330.4 (Titrimetric, DPD-FAS) STORET NO. 50060 Scope and ApphcatiOn 11 The N,N-diethyl-p-phenylene diamme (DPD) - ferrous ammomum sulfate (FAS) titration method IS appllcable to natural and treated waters at concentrations above 0 I mg/l CI SummaryofMethod 4 5 Intaferences 3 1 Bromme, bromamme and Iodme are mterferences WhICh are normally present m mSIgmficant amounts 32 OXIdIzed manganese mterferes but can be corrected by subtractiOn after performmg a titratiOn m the presence ofsodlUm arsemte (NaAs02) 33 Copper mterferes but IS accounted for (up to apprOXImately 10 mg!l copper) by mcorporation of EDTA The EDT A also retards deterIOratIOn ofDPD due to OXIdatIon and completely suppresses dIssolved oxygen errors by preventmg trace metal catalySIS 34 TurbIdIty and color may make the endpomt dIfficult to detect PractIce runs WIth spIked samples may be necessary Apparatus 4 1 Standard laboratory glassware IS used A ffilcroburet, 0-2 ml or 0-10 ml, dependmg on the concentration range expected, IS used Reagents 2 1 ,22 23 ChlorIne (hypochlorIte lOn, hypochlorous aCId) and chlorammes stOichIOmetrIcally hberate iOdme from potasslUm IodIde at pH 4 or less The IOdme IS titrated WIth F AS usmg DPD as the mdicator The results are calculated as mg/1 CI even though the actual measurement IS of total oXIdIzmg power because chlorme IS the dommant oXIdIzmg agent present 51 5 2 Phosphate buffer solutIOn DIssolve 24 g anhydrous disodlUm hydrogen phosphate, Na2HP04, and 46 g anhydrous potasslUm dihydrogen phosphate, KH2P04, m disttlied water DIssolve 800 mg disodlUm ethyienediamme tetraacetate dIhydrate m 100 ml dIstIlled water Combme these two solutiOns and dtlute to 1 hter WIth dIstIlled water Add 20 mg HgCl2as a preservatIve N,N-DIethyl-p-phenylenediamme (DPD) mdicator SolutIon DIssolve 1 g DPD oxalate or 1 5 g p-ammo-N,N-diethylamhne sulfate m chlOrIne free disttlied water contammg 8 ml of 1+3 H2S04and 200 mg disodlUm ethyienediamme tetraacetate dIhydrate DIlute to 1 hter, store m a colored, glass-stoppered bottle DIscard when dIscolored The buffer and mdicator sulfate are avatlable as a combmed reagent m stable powder form CAUTION The oxalate IS tOXIC, aVOid mgestlOn Approved for NPDES Issued 1978 3304-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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