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CHLORIDE Method 325.3 (Titrimetric, Mercuric Nitrate) STORET NO. 00940 1 Scope and Application 11 This method IS applicable to dnnkmg, surface, and saline waters, domestic and mdustnal wastes 12 The method IS sUItable for all concentratIOn ranges of chlonde content, however, m order to aVOId large tItratIon volume, a sample aliquot contammg not more than 10 to 20 mg CI per 50 mIls used 13 Automated titratIOn may be used 2 Summary of Method 2 1 An aCidified sample IS titrated with mercunc mtrate m the presence of mixed dlphenylcarbazone-bromophenol blue mdlcator The end pomt of the titration IS the fonnatIOn of the blue-vIOlet mercury dlphenylcarbazone complex 3 Comments 3 1 Amons and cations at concentrations normally found m surface waters do not mterfere 3 2 Sulfite mterference can be elimmated by oXldlzmg the 50 ml of sample solutIOn with 0 5 t o 1 m l o f H 20 2 4 Apparatus 4 1 Standard laboratory tItnmetnc eqUIpment mcludmg a 1 ml or 5 ml mlcroburet with 0 01 ml graduatIOns 5 Reagents 51 52 53 54 55 56 57 StandardsodIUmchlonde,0025N DIssolve14613g±00002gsodIUmchlonde(dned at 600°C for 1 hour) I n chlonde-free water I n a 1 lIter volumetnc flask and dIlute to the mark I ml = 886 5 fJg Cl Nltnc aCid, HN03solutIOn (3 + 997) Sodmm hydroxide solutIOn, NaOH, (10 gil) Hydrogen peroxide (30%), H 20 2 Hydroqumone solutIOn (10 g/liter) Dissolve 1 g ofpunfied hydroqumone m water m a 100 ml volumetnc and dtlute to the mark Mercunc mtrate titrant (0141 N) Dissolve 25 g Hg(N03)2-H20 m 900 ml of dlsttlled water aCidified with 50 ml conc HN03mal liter volumetnc flask and dtlute to the mark with distilled water Filter If necessary Standardize agamst standard sodmm chlonde solutIOn (5 1) usmg procedure 6 Adjust to exactly 0 141 N and check Store m a dark bottle A 1 00 ml aliquot IS eqUIvalent to 5 00 mg of chlonde Mercuric mtrate titrant (0 025 N) Dissolve 4 2830 g Hg(N03)2-H20 m 50 ml of dlsttlled wateraCidifiedwith05m1conc HN03(sp gr 142)mallitervolumetncflaskand dtlute to the mark with distilled water Filter If necessary Standardize agamst standard Approved for NPDES Issued 1971 EdItonal reVISIOn 1978 and 1982 3253-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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