Reduction of nitrate prior to Kjeldahl digestion

A - Papers appearing in refereed journals

Pruden, G., Kalembasa, S. J. and Jenkinson, D. S. 1985. Reduction of nitrate prior to Kjeldahl digestion. Journal of the Science of Food and Agriculture. 36 (2), pp. 71-73.

AuthorsPruden, G., Kalembasa, S. J. and Jenkinson, D. S.
Abstract

A new method is described for reducing nitrate prior to Kjeldahl digestion of soil and crop samples. Zinc is used to reduce CrIII to CrII, which in turn reduces NO3—N. Zinc powder is mixed with the sample, a solution of CrK(SO4)2 in H2SO4 added and the mixture allowed to stand at room temperature for 2h. The usual Kjeldahl reagents (K2SO4, CuSO4 and H2SO4) are then added and the digestion completed in a digestion block at 360°C. Nitrate is quantitatively converted to NH4—N, whether on its own, in plant material or in soil.

Keywordsnitrate reduction; total nitrogen in soil; total nitrogen in plants; Kjeldahl digestion
Year of Publication1985
JournalJournal of the Science of Food and Agriculture
Journal citation36 (2), pp. 71-73
Digital Object Identifier (DOI)doi:10.1002/jsfa.2740360203
Open accessPublished as non-open access
Output statusPublished
Publication dates
Print01 Feb 1985
Copyright licensePublisher copyright
PublisherWiley
ISSN0022-5142

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