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The characterization of the humic complexes of soil organic matter

Published online by Cambridge University Press:  27 March 2009

W. G. C. Forsyth
W. G. C. Forsyth
Affiliation:
Macaulay Institute for Soil Research, Aberdeen
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Extract

1. During the course of the alkali fractionation and the preparation of the humic precipitates, the qualitative characters of the fractions were followed by employing a standard hydrolysis with dilute acid. Humic acid itself was shown to be unhydrolysed by this reagent, and, therefore, the extent of hydrolysis of a humic fraction can be used as a criterion of purity.

2. Studies on the fractionation of the humic precipitate with aqueous, anhydrous, and alcoholic bases, led to the following conclusions:

(a) The humic precipitate as normally prepared i s always a mixture of true humic acid with varying amounts of co-precipitated material of a non-humic nature.

(b) This non-humic material is not an integral part of the humic molecules, it is merely co-precipitated and adsorbed contaminants.

(c) The non-humic material is differentiated from the humic acids by the following properties: (i) it is hydrolysable with acid; (ii) it does not give the characteristic nitro-humic compound on nitration.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 37 , Issue 2 , April 1947 , pp. 132 - 138
Copyright
Copyright © Cambridge University Press 1947

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