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ISO 5663:1984 Water quality - Determination of Kjeldahl nitrogen - Method after mineralization with selenium
standard by International Organization for Standardization, 05/01/1984
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Specifies a procedure for the determination of trivalent negative nitrogen. Organic nitrogen in the form of azide, azine, azo, hydrazone, nitrite, nitro, nitroso, oxime or semicarbazone is not determined quantitatively. The procedure is applicable to the analysis of raw, potable and waste waters.