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6 II, Stock mtrate solutIOn DIssolve 7 218 g KN03 and dIlute to 1 lIter m a volumetnc flask wIth dIstilled water Preserve wIth 2 ml of chloroform per lIter SolutIon IS stable for 6 months 1ml= 10mgN03-N 6 12 Stock mtnte SolutIon DIssolve 6 072 g KN02 m 500 ml ofdIstilled water and dIlute to 1 lIter m a volumetnc flask Preserve wIth 2 ml ofchloroform and keep under refngeratIOn 1OmI =10mgN02-N 6 13 Standard mtrate SolutIon DIlute 10 0 ml ofstock mtrate solutIOn (6 11) to 1000 ml 10 ml = 001 mg NOrN Preserve wIth 2 ml ofchloroform per hter SolutIOn IS stable for 6 months 6 14 Standard mtnte SolutIon DIlute 100 ml ofstock mtnte (6 12) solution to 1000 ml 10m! = 001mgN02-N SolutIOnISunstable,prepareasreqUIred 6 15 Usmg standard mtrate SolutIon (6 13), prepare the followmg standards m 1000 ml volumetnc flasks At least one mtnte standard should be compared to a mtrate standard at the same concentratIon to venfy the effiCIency of the reductIOn column ml Standard SolutIOnllOO ml 00 o 005 05 010 10 020 20 050 50 100 100 200 200 400 400 600 600 NOTE 2' When the samples to be analyzed are salIne waters, Substitute Ocean Water (SOW).should be used for prepanng the standards, otherWIse, dIstilled water IS used A tabulatIOn ofSOW compOSItion follows NaCI- 2453gil CaCl2 - 116 gil KBr - 010 gil NaF- 0003gil 7 Procedure MgCl2 - 520gil KCI - 070 gil H3B03 - 003 gil Na2S04 - 409gil NaHC03 - 020 gil SrCl2 - 003 gil 7 1 72 73 If the pH of the sample IS below 5 or above 9, adjust to between 5 and 9 WIth eIther conc HClorconc NH40H Set up the mamfold as shown m FIgure 2 (AAI) or FIgure 3 (AAII) Note that reductant 0 column should be m 20 mclme pOSItIOn (AAI) Care should be taken not to mtroduce aIr mto reductIOn column on the A A II Allow both colonmeter and recorder to warm up for 30 mmutes Obtam a stable baselIne WIth all reagents, feedmg dIstilled water through the sample lme NOTE 3: CondItIon column by runnmg 1 mgll standard for 10 mmutes If a new reductIon column IS bemg used Subsequently wash the column WIth reagents for 20 mmutes 3532-4PDF Image | Methods for Chemical Analysis of Water and Wastes
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