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CHLORINE, TOTAL RESIDUAL Method 330.2 (Titrimetric, Back, Iodometric) (Starch or Amperometric Endpoint) STORET NO. 50060 1 Scope and Apphcat10n l I T h e lOdometnc backt1trat10n method IS apphcable to all types of waters but IS pnmanly used for wastewater because It ehmmates any contact between the full concentratIon of hberated 10dme and the wastewater 2 Summary of Method 2 1 22 23 24 Chlonne (hypochlonte lon, hypochlorous aCId) and chlorammes stOlchlOmetncally hberate 10dme from potaSSIUm lOdlde at pH 4 or less The lOdme ImmedIately quantitatIvely oXIdIzes a standardIzed reducmg agent such as sodIUm thlOsulfate or phenylarsme OXIde The excess reducmg agent IS then determmed by t1tratmg WIth a standard lOdme tItrant The starch endpomt color change IS from clear to blue A subtractlOn of the excess amount of reducmg agent IS mcluded m the calculatlOns and the results are reported as mg/l CI even though the actual measurement IS of total oX1d1zmg power because chlonne IS the dommant oX1d1zmg agent present 3 Interferences 31 Manganese, Iron and mtnte mterference may be m1mm1zed by buffenng to pH 4 before the addItion ofKI 32 HIgh concentratlOns oforgamcs may cause uncertamty m the endpomt ThIS uncertamty can be reduced by aC1d1fymg to pH 1 0 Ifmanganese, Iron and mtnte are absent 33 TurbIdIty and color may make the endpomt dIfficult to detect PractIce runs WIth spIked samples may be necessary 4 Apparatus 4 1 Standard laboratory glassware IS used A mlCroburet 0-2 ml or 0-10 ml IS used dependmg on the deSIred range and accuracy 5 Reagents 51 Phenylarsme OXIde solutlOn (000564N) Wallace and T1erman or eqUivalent StandardIze WIth potaSSIUm bllodate (5 6, 5 9) 52 Acetate buffer solutlOn (pH 4) DIssolve 146 g anhydrous NaCzH30z or 243 g N a C z H 3 0 z· 3 H z O m 4 0 0 m l d 1 s t l 1 l e d w a t e r , a d d 4 8 0 g c o n c a c e t I c a C I d a n d d l 1 u t e t o 1 h t e r WIth d1stl1led water 53 Standard lOdme solutlOn (0 IN) DIssolve 40 g KI m 25 ml d1stl1led water, add 13 g resubhmedlOdmeandstIruntl1dIssolved Transfertoa1htervolumetncflaskanddl1ute to the mark Determme the exact normahty (5 11) Approved for NPDES Issued 1978 3302-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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