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610 Usmg standard solutIOns A and B, prepare the followmg standards m 100 ml volumetnc flasks (prepare fresh dally) 7 Procedure 7 1 72 73 74 Smce the mtenslty of the color used to quantIfy the concentratIOn IS pH dependent, the aCId concentratIOn of the wash water and the standard ammoma solutIOns should approXImatethatofthesamples Forexample,IfthesampleshavebeenpreservedwIth2 ml cone H2S04/hter, the wash water and standards should also contam 2 ml cone H2S04/hter For a workmg range of0 01 to 200 mg NH3-N /l (AAI), set up the mamfold as shown m FIgure 1 For a workmg range of 01 to 10 mg NH3-N/l (AAII), set up the mamfold as shownmFIgure2 HIgherconcentratIOnsmaybeaccommodatedbysampledIlutIOn Allow both colonmeter and recorder to warm up for 30 mmutes Obtam a stable basehne wIth all reagents, feedmg dIStilled water through sample hne For the AAI system, sample at a rate of 20/hr, 1 1 For the AAII use a 60/hr 6 1 cam wIth a common wash NaCI MgCl2 Na2S04 CaCl2 KCI 2453 gil 520 gil 409 gil 116 gil 070 gil Substitute Ocean Water (SOW) NaHC03 020 gil KBr 010 gil H3B03 003 gil SrCl2 003 gil NaF 0003 gil NHrN, mg/l 001 002 005 010 020 050 080 100 150 200 ml Standard SolutIOnllOO ml SolutIOn B 10 20 50 100 SolutIOn A 20 50 80 100 150 200 NOTE 3: When salme water samples are ap-'lyzed, SubstItute Ocean Water (SOW) should be used for prepanng the above standards used for the cahbratIOn curve, otherwiSe,dIstIlledwaterISused IfSOWISused,subtractItSblankbackgroundresponse from the standards before prepanng the standard curve 3501-3PDF Image | Methods for Chemical Analysis of Water and Wastes
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