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CHLORINE, TOTAL RESIDUAL Method 330.1 (Titrimetric, Amperometric) STORET NO. 50060 1 Scope and ApphcatlOn l i T h e amperometnc titratIOn method IS apphcable to all types of waters and wastes that do not contam a substantIal amount oforgamc matter 2 Summary of Method 2 1 Chlonne (hypochlonte lon, hypochlorous aCId) and chlorammes stolcmometncally hberate Iodme from potassIUm IodIde at pH 4 or less 2 2 The Iodme IS titrated wIth standard reducmg agent such as sodIUm thIOsulfate or phenylarsme oXIde usmg an amperometer to determme the end pomt 2 3 The results are calculated as mg/l CI even though the actual measurement IS of total oXldlzmg power because chlonne IS the dommant oXldlzmg agent present 3 Interferences 31 Manganese, mtnte and Iron do not mterfere 32 Stlmng can lower chlonne values by volatlhzatlOn 33 If dIlutIon IS necessary, It must be done wIth dIstIlled water WhICh IS free of chlonne, chlonne-demand and ammoma 34 Copper and sIlver pOlson the electrode 4 Apparatus 4 1 An amperometer conslstmg of a mlcroammeter wIth necessary electncal accessones, a cell umt wIth a salt bndge, reference electrode and an agItator CommercIally avaIlable If the entIre system (mcludmg tItrant dehvery system) IS to be used, make sure that the volume read off the pIpet or buret IS really bemg dehvered to the sample cell ReservOlr- type system sometImes back up, producmg false readmgs A mlcroburet, 0-2 ml or 0-10 ml, dependmg on reqUIred precISIon, accuracy and range 4 2 5 Reagents 5 1 5 2 5 3 Phenylarsme OXIde solutIOn (0 00564N), commercIally avaIlable, Wallace and TIernan or eqUIvalent StandardIze WIth potassIUm bllodate (5 8, 5 9) PotassIUm IodIde, KI, crystals PotassIUm IodIde SolutIon DIssolve 50 g KI m freshly boIled and cooled dIstilled water and dIlute to 1 hter Store m colored, glass-stoppered bottle m refngerator DIscard when yellow color develops CommerCIally avaIlable starch mdIcators such as thyodene or eqUIvalent may be used 5 4 55 Acetate buffer solutIOn (pH 4) DIssolve 146g anhydrous NaC2H302 or 243g NaC2H 30 2-3H20 m 400 ml dIstIlled water, add 480g conc acetIc aCId and dIlute to 1 hter WIth dIstilled water Approved for NPDES Issued 1974 Edltonal reVISIon 1978 3301-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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