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NITROGEN, NITRITE Method 354.1 (Spectrophotometric) STORET NO. Total 00615 1 Scope and ApplIcatIOn 1 1 This method is applIcable to the determmatIOn of mtnte m dnnkmg, surface and salIne waters, domestic and mdustnal wastes 1 2 The method is applIcable m the range from 0 01 to 1 0 mg N02-N/1 2 Summary of Method 2 1 The diazomum compound formed by diazotatIOn of sulfamlamide by mtnte m water under aCid conditions is coupled with N-(l-naphthyl)-ethylenediamme dihydrochlonde to produce a reddish-purple color which is read m a spectrophotometer at 540 nm 3 Sample HandlIng and PreservatIOn 3 1 Samples should be analyzed as soon as possible They may be stored for 24 to 48 hours at 4°C 4 Interferences 4 1 There are very few known mterferences at concentratIOns less than 1,000 times that of the mtnte, however, the presence of strong oXidants or reductants ill the samples w111 readily affect the mtnte concentratIOns High alkalImty (> 600 mg/1) will give low results due to a shift m pH 5 Apparatus 5 1 Spectrophotometer eqUipped with 1 cm or larger cells for use at 540 nm 5 2 Nessler tubes, 50 ml or volumetnc flasks, 50 ml 6 Reagents 61 62 6 3 64 Distl1led water free of mtnte and mtrate is to be used m preparatIOn of all reagents and standards Buffer-color reagent To 250 ml of distilled water, add 105 ml conc hydrochlonc aCid, 50 g sulfamlamide and 05 g N-(1-naphthyl) ethylenediamme dihydrochlonde Stir untl1 dissolved Add 136 g of sodmm acetate (CH3COONa-3H20) and agam stir untl1 dissolved Dl1ute to 500 ml with distl1led water ThiS solutIOn is stable for several weeks if stored m the dark Nitnte stock solutIOn 10 ml = 0 10 mg N02-N Dissolve 0 1493 g ofdned anhydrous sodmm mtnte (24 hours m deSiccator) m distilled water and dl1ute to 1000 ml Preserve with 2 ml chloroform per lIter Nitnte standard solutIOn 10 ml = 0001 mg N02-N Dl1ute 100 ml of the stock solutIOn (6 3) to 1000 ml 7 Procedure 7 1 If the sample has a pH greater than 10 or a total alkalImty m excess of 600 mg/1, adjust to approximately pH 6 with 1 3 HCI Approved for NPDES Issued 1971 354 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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