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6 Reagents 6 1 6 2 6 3 64 65 Dlstllied water Special precaution must be taken to msure that distilled water IS free of ammoma Such water IS prepared by passage of distilled water through an Ion exchange column compnsed of a mixture of both strongly aCidic catlOn and strongly basIc amon exchange resms The regeneratlOn of the Ion exchange column should be carned out accordmg to the mstructlOn ofthe manufacturer NOTE 1: All solutlOns must be made usmg ammoma-free water Sulfunc aCid 5N Air scrubber solution Carefully add 139 ml of conc sulfunc aCid to approximately 500 ml of ammoma-free distilled water Cool to room temperature and dtlute to 1 hter with ammoma-free dlsttlled water Sodmm phenolate Usmg a 1 hter Erlenmeyer flask, dissolve 83 g phenol m 500 ml of distilled water In small mcrements, cautlOusly add With agltatlOn, 32 g of NaOH PenodIcally cool flask under water faucet When cool, dilute to 1 hter With distilled water Sodmm hypochlonte solutlOn Dl1ute 250 ml of a bleach solutlOn contammg 525% NaOCI(suchas"Clorox")to500mlWithdistilledwater Avatlablechlonnelevelshould approxImate 2 to 3% Smce "Clorox" IS a propnetary product, ItS formulatlOn IS subject to change The analyst must remam alert to detectmg any vanatlOn m this product slgmficant to ItS use m this procedure Due to the mstablhty of this product, storage over an extended penod should be aVOIded Dlsodmm ethylenedlamme-tetraacetate (EDTA) (5%) Dissolve 50 g of EDTA (dIsodmm salt) and approximately SIX pellets of NaOH m 1 hter of distilled water NOTE 2: On salt water samples where EDT A solution does not prevent preCipitation of cations, sodmm potassmm tartrate solutlOn may be used to advantage It IS prepared as follows 6 5 1 Sodmm potassmm tartrate solutlOn 10% NaKC4H40 6e4H20 To 900 ml of distilledwateradd100gsodmmpotassmmtartrate Add2pelletsofNaOHanda few bollmg chips, boll gently for 45 mmutes Cover, cool, and dl1ute to 1 hter With ammoma-free distilled water Adjust pH to 5 2 ± 05 With H2S04 After allowmg to settle overmght m a cool place, filter to remove preCipitate Then add 1/2 ml BnJ- 35(4) (avatlable from Techmcon CorpOl:atlon) solution and store m stoppered bottle Sodmm mtroprusslde (005%) Dissolve 05 g of sodium mtroprusslde m 1 hter of dlsttlled water Stock solution Dissolve 3819 g of anhydrous ammomum chlonde, NH4Cl, dned at 105°C, m distilled water, and dl1ute to 1000 m ilO ml = 1 0 mg NH3-N Standard SolutlOn A Dllute 10 0 ml of stock solutlOn (6 7) to 1000 ml With distilled water 10ml=001mgNHrN Standard solution B Dllute 10 0 ml of standard solution A (68) to 100 0 ml With dIstilledwater 10ml= 0001mgNH3-N 66 67 6.8 69 350 1-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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