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SULFITE Method 377.1 (Titrimetric) 1 Scope and Apphcatton 11 ThIS method IS apphcable to dnnkmg and swface waters, sewage and mdustnal wastes The pnmary apphcatton has been to coohng, process and dlstnbutton water systems and boller feedwaters to WhICh sulfide IS added m order to reduce dISsolved oxygen and ehmmate corrOSIOn 12 ThemInImUmdetectablehmltIS2-3mg/lS03 2 Summary of Method 2 1 An aCldrned sample contammg a starch mdlcator IS tItrated wIth a standard potassIUm IOdIde-IOdate tItrant to a famt permanent blue end pomt WhICh appears when the reducmg power of the sample ha~been completely exhausted 3 Interferences 31 The temperature of the sample must be below 50°C 32 Care must be taken to allow as httle contact wIth aIr as pOSSIble For example, do not filterthesample KeeptheburettIpbelowthesurfaceofthesample 33 Other oXidIzable substances, such as organIC compounds, ferrous Iron and sulfide are posItIve mterferences. Sulfide may be removed by addmg 0 5g of zmc acetate and analyzmg the supernatant ofthe settled sample 34 Nltnte gIves a negatIve mterference by oXldlzmg sulfite when the sample IS aCIdIfied, thIS IS corrected by eIther usmg a propnetary mdlcator whIch ehmmates nItnte or by addmg sulfamlc aCId 35 Copper and pOSSIbly other heavy metals catalyze the oXIdatIon of sulfite, EDTA IS used to complex metals 36 A blank must be run to correct for mterferences present m the reagents 4 Apparatus 4 1 Standard laboratory glassware IS used 5 Reagents 5 1 52 53 Sulfunc aCId, H2S04, 1+1 Starch mdlcator Amylose, Malhnckrodt ChemIcal Works, Thyodene, Magnus ChemIcalCo oreqwvalent Dual-Purpose Sulfite IndIcator Powder a propnetary formulation contammg sulfamlc aCId to destroy nItnte 54 Standard potaSSIUm IOdIde-IOdate titrant, OOl25N DIS&olve 4458 mg anhydrous potaSSIUm IOdate, KI03(pnmary standard grade dned for several hours at 120°C), 4 25g Approved for NPDES Issued 1974 Edltonal reVISIOn 1978 377 1-1 STORET NO. 00740PDF Image | Methods for Chemical Analysis of Water and Wastes
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