Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
A Theoretical Consideration on Chemical Reactions in the Kjeldahl Digestion
Yazaemon Morita
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1968 Volume 41 Issue 9 Pages 2029-2032


The decomposition of organic nitrogen compounds by Kjeldahl digestion was discussed and some experiments were carried out. The relationship between the amount of sulfuric acid consumed and the amount of ammonia produced at various stages including final ones of the decomposition was examined. As a result, chemical reaction of decomposition was evaluated, and the temperature at the initial stage reveals one of the important factors which determine the ratio of oxidative action of hot concentrated sulfuric acid to reductive action of sulfur dioxide produced in the reaction system. It is concluded that, if the temperature of initial stage is adjusted properly, it is possible to decompose mostly nitro and azo compounds into ammonia by sulfuric acid containing potassium sulfate without reductive pretreatment which has previously been believed to be indispensable.

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