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sodIum chlonde solutIOn (5 1) usmg procedure 6 Adjust to exactly 0 025 N and check Store m a dark bottle 58 Mercunc filtrate tItrant (00141 N) DIssolve 24200 g Hg(N03)2eH20 m 25 ml of 5 9 dlst111ed water aCIdIfied wIth 0 25 ml ofconc HN03(sp gr 142) mal hter volumetnc flask and dl1ute to the mark wIth dlst111ed water FIlter If necessary StandardIze agamst standard sodmm chlonde solutIOn (5 1) usmg procedure 6 Adjust to exactly 00141 N and check Store m a dark bottle A 1ml ahquot IS eqmvalent to 500 ug ofchlonde MIxed mdIcator reagent DIssolve 0 5 g crystallme dlphenylcarbazone and 0 05 g bromophenol blue powder m 75 m195% ethanol m a 100 m1 volumetnc flask and dl1ute to the mark wIth 95 % ethanol Store m brown bottle and dIscard after 6 months 5 10 Xyleneqanole FF solutIOn DIssolve 0 005 g of xylene cyanole FF dye m 95% ethanol or Isopropanol m a 100 ml volumetrIc and dIlute to the mark with 95% ethanol or Isopropanol 6. Procedure , 6.1 62 6.3 64 65 66 6.7 t:se50 ml of sample oran ahquot of sample dIluted t050 ml with dIstilled water, so that the concentratIon of chlonde does not exceed 20 mg/ahquot If the sample or ahquot contams more than 25 mg of chlonde, use 0 025N mercunc mtrate tItrant (5 7) m step 6.6 If the sample or ahquot contams less than 25 mg of chlonde, use 0 014lN mercunc' mtrate titrant (5 8) m step 66 Determme an mdicator blank on 50 ml chlonde-free waterusmgstep66 Ifthesamplecontamslessthan0I mg/lofchlondeconcentratean appropnate volume to 50 ml Add 5 drops of mIxed mdicator reagent (59), shake or SWIrl solutIon If a blue-VIolet or red color appears add HN03solutIon (5 2) dropwlse untl1 the color changes to yellow If a yellow or orange color forms ImmedIately on addItIOn of the mIxed mdlcator, add NaOH solutIOn (5,3) dropwlse untl1 the color changes to blue-VIOlet, then add HN03 solutIon (5 2) dropwise untl1 the color changes to yellow Add1mlexcessHN03solutIOn(52) TItrate WIth 0 025 N mercunc mtrate tItrant (5 7) untl1 a blue-VIOlet color perSIsts throughout the solutIOn See 6 1 for chOlce of titrant normahty !Xy,lene cyanollFF SolutIon (5 10) may be added WIth the mdlcator to sharpen the end pomt ThIS WIll changecolorshades PractIcerunsshouldbemade AddItional steps to ehmmate partIcular mterferences 6 7 1 If chromate IS present and Iron IS not present the end pomt may be dIffIcult to detect be an ohve-purple color 672 If chromate IS present at > 100 mg/1 and Iron IS 'not present, add 2 ml of fresh hydroqumone SolutIon (5 5) 6 7 3 Iffernc Ion IS present use volume contammg no more than 2 5 mg offernc Ion or ferncIonpluschromateIOn Add2mlfreshhydroqu~noneSolutIon(55) 674 Ifsulfite Ion IS present, add 05 ml ofH20 2SolutIon (54) to 50 ml sample and mIX for 1mmute 3253-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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