A modified oxidation-reduction titration method for the determination of nitrogen in organic matter after Kieldahl dieestion is described. The catalysts includine copper, selenium or mercury, which often interfere with the end point of oxidation-reduction titratIon, were removed by addition of zinc granules.
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官自元.有机物中氮的简易测定[J].土壤学报,1964,12(1):91-93. KUAN TZE-YAN. DETERMINATION OF NITROGEN IN ORGANIC SUBSTANCES[J]. Acta Pedologica Sinica,1964,12(1):91-93.