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8 7 8 Standards Carry out the reductlOn ofstandards exactly as descnbed for the samples At least one mtnte standard should be compared to a reduced mtrate standard at the same concentratlOn to venfy the efficIency of the reductIon column CalculatlOn 9 1 2 3 4 Standard Methods for the ExammatlOn of Water and Wastewater, 14th EdItIon, p 423, Method 419C (1975) Hennkson, A , and Selmer-Olsen, "AutomatIc Methods for Determmmg NItrate and Nitnte m Water and SOlI Extracts" Analyst, May 1970, Vol 95, P 514-518 Grasshoff, K , "A SImultaneous Multiple Channel System for Nutnent AnalysIs m Sea Water wIth Analog and DIgItal Data Record", "Advances m Automated AnalysIs", Techmcon InternatlOnal Congress, 1969, Vol 11, P 133-145 Brewer, P G, RIley, J P , "The AutomatIc DetermmatlOn ofNItrate m Sea Water", Deep Sea Research, 1965, Vol 12, p 765-772 Obtam a standard curve by plottmg the absorbance of standards run by the above procedure agamst NOrN mg/l Compute concentratlOn of samples by companng sample absorbance wIth standard curve If less than 25 ml of sample IS used for the analysIs the followmg equatIon should be used A x 25 mgN02 + N03 - Nil = ml sample used where A = ConcentratlOn ofmtrate from standard curve PrecIslOn and Accuracy 8 1 8 2 9 1 92 In a smgle laboratory (EMSL), usmg sewage samples at concentratlOns of0 04, 0 24, 055 and 104 mg N03 +N02-N/l, the standard devIatlOns were ±O005, ±O004, ±O005 and _±O 01, respectIvely In a smgle laboratory (EMSL), usmg sewage samples at concentratIons of0 24, 055, and 105mgN03 +N02-N/l,therecoveneswere100%,102%and100%,respectIvely BIblIography 3533-5PDF Image | Methods for Chemical Analysis of Water and Wastes
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