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72 Lead acetate DIssolve 30 g of Pb (C2H302)e3H20 m950 ml of dIstIlled water Adjust the pH to 4 5 wIth acetIc aCId DIlute to 1 lIter 75 Sulfunc aCId, 18N Slowly add 500 ml of concentrated H2S04 to 500 ml of dIstIlled water 7 6 SodIUm ~:hhydrogenphosphate, 1 M DIssolve 138 g of NaH2P 04-H20 m 1 hter of dIstilledwater RefrIgeratethIssolutIOn 77 7 8 Stock cyamde solutIOn DIssolve 2 51 g of KCN and 2 g KOH m 900 ml of dIstIlled water StandardIze wIth 00192 N AgN03 DIlute to appropnate concentratIon so that I ml =1 mgCN Standard cyamde solutIOn, mtermedlate DIlute 1000 ml of stock (l ml = 1 mg CN) to 1000 ml wIth dIstIlled water (l ml =100 0 ug) , , , 79 Workmg standard cyamde solutIOn Prepare fresh daIly by dIlutmg 1000 ml of IntermedIate cyamde solutIOn to 1000 ml wIth dIstIlled water and store m a glass stoppered bottle 1 ml = 10 0 ug CN 7 10 Standard silver mtrate solutIOn, 00192 N Prepare by crushmg approxImately 5 g AgN03 crystals and drymg to constant weIght at 40°C WeIgh out 32647 g of drIed AgN03, dIssolve m dIstIlled water, and dIlute to 1000 ml (1 ml = 1mg CN) Rhodamne mdicator DIssolve 20 mg of p-dimethyl-ammo-benzalrhodanme m 100 ml of acetone Chloramme T solutIOn DIssolve 109 ofwhIte, water soluble Chloramme T m 100 ml of dIstIlled water and refngerate untIl ready to use Prepare fresh daIly Color Reagent - One ofthe followmg may be used 7 11 7 12 7 13 7131 PyrIdme-BarbiturIc ACId Reagent Place 15 g of barbItUrIC aCId m a 250 ml volumetrIC flask and add Just enoughPDF Image | Methods for Chemical Analysis of Water and Wastes
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