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6. 5 I 6 DIgItal pnnter for AAII (OptIOnal) Reagents 6 I 6 2 Granulated cadmIUm 40-60 mesh (MCB Reagents) Copper-cadmIUm The cadmIUm granules (new or used) are cleaned wIth dIlute HCI (67) and coppenzed wIth 2% solutIOn ofcopper sulfate (6 8) In the follOWIng manner 621 Wash the cadmIUm wIth HCI (6 7) and nnse wIth dIstIlled water The color of the cadmIum so treated should be sIlver 6 2 2 SWlr1lO g cadmIUm In 100 ml portIOns of 2% solutIOn of copper sulfate (6 8) for five mInutes or untIl blue color partIally fades, decant and repeat WIth fresh copper sulfate untIl a brown collOIdal preCIpItate forms J. J..r " 623 Wash the cadmIUm-copper WIth dI~tIlled water (at least 10 times) to remove all the precipItatedcopper Thecolorofthe~admIUmsotreatedshouldbeblack PreparatIOn of reductIOn column A A I The reductIOn column IS an 8 by 50 mm glass tube With the ends reduced In diameter to permIt InSertIOn Into the system Copper-cadmIUm granules (6 2) are placed In the column between glass wool plugs The packed reductIOn column IS placed In an up-flow 20° InclIne to mInlIIllZe channelIng See Figure 1 PreparatIon of reductIOn column AAII The red~ctioncolumn IS a V-shaped, 35 cm ,'li' Ij. I " I' G length, 2 mm I D glass ~ube (NQte 1) Fill the reductIOn column WIth dIstIlled water to prevent entrapment of air bubbles dunng the fillIng operatIons Transfer the copper- cadmIUm granules (6 2) t~the reductIon column and place a glass wool plug In each end To prevent ent"rapment ofair bubbles In the reductIOn column be sure that all pump tubes are filled With reagents before puttIng the column Into the analytIcal system NOTEi: A 0081 I D pump tube (purple) can be used In place ofthe 2 mm glass tube DIstIlled water Because of pOSSible contamInatIOn, thIS should be prepared by passage through an IOn exchange column compnsed of a mIxture of both strongly aCIdIc-catIon and strongly baslc-amon exchange reSInS The regeneratIOn of the IOn'exchange column should be carned out accordIng to the manufacturer's InstructIons Color reagent To apprOXImately 800 ml of dIstIlled water, add, whIle stlrnng, 100 ml conc phosphonc aCid, 40 g sulfamlamlde, and 2 g N-1- naphthylethylenediamIne dlhydrochlonde St~pP-,tIl dlssolyed and dIlute to 1 lIter Store In brown bottle and keep InthedarkwhennotInuse ThISsolutIonISstableforseveralmonths DIlute hydrochlonc aCId, 6N DIlute 50 ml ofconc HCI to 100 ml WIth distIlled water Copper sulfate solutIon, 2% DIssolve 20 g of CuS04-5HzO In 500 ml of distIlled water and ddute to 1 lIter Wash solution Vse distIlled water for unpreserved samples For samples preserved With H2S04, use2m1HzSO.4pel'lIterofwashwater 6.3 64 65 6.6 6.7 68 69 6 10 AmmonIUm: ~hionde-Eb"~A ~,plutI~~ PI~solye, 85 i of reagent grade ammomum chlonde and 0 1 g of dlsodIUm ethylenedIamIne tetracetate In 900 ml of distIlled water Adjust the pH to 8 5 WIth conc ammomum hydroxIde and dIlute to 1 lIter Add 1/2 ml BnJ-35 (avaIlable from Techmcon CorporatIon) I 3532-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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