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74 Place appropnate mtrate and/or mtnte standards m sampler m order of decreasmg concentratiOnofmtrogen CompleteloadmgofsamplertraywIthunknownsamples 75 For the AAI system, sample at a rate of 30/hr, 1 1 For the AAII, use a 4O/hr, 4 1 cam and a common wash 76 SWItch sample hne to sampler and start analysIs 8 Calculations 8 1 Prepare appropnate standard curve or curves denved from processlllg NOz and/or N 03 standards through mamfold Compute concentratiOn of samples by companng sample peak heIghts wIth standard curve 9 PrecISiOn and Accuracy 9 1 Three laboratones partlcipatlllg III an EP A Method Study, analyzed four natural water samples contallllllg exact lllcrements of morgamc mtrate, wIth the followlllg results Increment as NItrate NItrogen mg N/hter 029 035 231 248 Accuracy as mg N/hter +0017 +0063 +0103 -0067 PreCiSIOn as Standard DeViatIOn mg N/hter 0012 0092 0318 0176 Blbhography 1 Flore, J , and O'Bnen, J E , "AutomatiOn III Samtary ChemIstry - parts 1 & 2 DetermlllatiOn of NItrates and Nitntes", Wastes Engllleenng 33, 128 & 238 (1962) 2 Armstrong, F A , Steams, C R , and Stnckland, J D , "The Measurement of Upwelhng and Subsequent BiOlogIcal Processes by Means of the Techmcon AutoAnalyzer and ASSOCIated EqUlpment", Deep Sea Research 14, p 381-389 (1967) 3 AnnualBookofASTMStandards,Part31,"Water",StandardD1254,p366(1976) 4 ChemIcal Analyses for Water Quahty Manual, Department of the Intenor, FWPCA, R A Taft Samtary Engllleenng Center Trallllllg Program, Cmclllnatl, OhIO 45226 (January, 1966) 5 Annual Book of ASTM Standards, Part 31, "Water", Standard D 1141-75, SubstItute Ocean Water, p48 (1976) 3532-5 BIas, % + 575 +1810 + 447 - 269 BIas,PDF Image | Methods for Chemical Analysis of Water and Wastes
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