Abstract
AN investigation into the mode of occurrence of nitrogen in coals necessitated devising a suitable method for its determination. The ordinary macro-Kjeldahl method was much improved in speed and reliability by using a mixed selenium–mercury catalyst with the usual potassium sulphate; but even in this case some doubt always existed as to when the conversion of all the combined nitrogen of the substances into ammonia was complete, and whether there might be loss of ammonia during the digestion, which was indeed observed when the temperature was greater than 370° C.
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References
J. App. Chem., 5, 373 (1954).
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BEET, A. Potassium Permanganate in the Kjeldahl Method for the Determination of Nitrogen in Organic Substances. Nature 175, 513–514 (1955). https://doi.org/10.1038/175513b0
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DOI: https://doi.org/10.1038/175513b0
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