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CHLORINE, TOTAL RESIDUAL Method 330.3 (Titrimetric, Iodometric) STORET NO. 50060 1 Scope and ApphcatIOn l I T h e 10dometnc titratIOn method IS apphcable to natural and treated waters at concentratIOns greater than 0 1 mg/l 2 Summary of Method 2 1 Chlorme (hypochlonte lon, hypochlorous aCld) and chlorammes st01chIOmetncally hberate IOdme from potassmm 10dlde at pH 4 or less 2 2 The IOdme IS tltrated wlth a standard reducmg agent such as sodmm thIOsulfate or phenylarsme oXlde usmg a starch mdlcator 2 3 The results are calculated as mg/1 CI even though the actual measurement IS of total oXldlzmg power because chlonne IS the dommant oXldlzmg agent present 3 Interferences 3 1 32 33 Femc, mangamc and mtnte 10ns mterfere, the neutral titratlOn mlmmlZeS these mterferences Acetlc aCld IS used for the aCld tltratIOn Sulfunc aCld may be used If no mterferences are present HydrochloncaCldshouldneverbeused Turbldlty and color may make the endpomt dlfficult to detect Practlce runs wlth splked samples may be necessay 4 Apparatus 4 1 Standard laboratory glassware IS used A mlCroburet 0-2 m1 or 0-10 mils used dependmg on the deslred range and accuracy 5 Reagents 51 52 53 54 55 56 57 58 Acetic aCld, conc (glaclal) Potassmm 10dlde, KI, crystals Phenylarsme oXlde (000564N) Wallace and Tleman or eqmvalent Standardize wlth potassmm bllodate (5 8, 5 12) Phenylarsme oXlde (00375N). Hach Chemlcal Co or eqmvalent Standardlze wlth potassmm bllodate (57,5 13) CommerCially avaIlable starch mdICators such as thyodene or eqUIvalent may be used Potassmm bllodate (0 IN) Dlssolve 3 249 g potassmm bllodate, prevl0usly dned two hours at 103°C, m dlstllled water and dllute to 1 0 hter Store m a glass stoppered bottle Potassmm bllodate (0 05N) Dllute 500 ml of0 1 N potassmm bllodate (5 6) to 1 hter m a volumetncflask Storemglassstopperedbottle Potassmm bllodate (0 005N) Dllute 50 ml of 0 1 N potassmm bllodate (5 6) to 1 hter m a volumetncflask Storemglassstopperedbottle Approved for NPDES Issued 1978 3303-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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