Viscosimetric characteristics of humic acid
Open Access
- 1 September 1968
- journal article
- research article
- Published by Taylor & Francis in Soil Science and Plant Nutrition
- Vol. 14 (5) , 190-197
- https://doi.org/10.1080/00380768.1968.10432764
Abstract
One of the authors, KUMADA (I), has proposed a new classification of humic acids based on their colour and spectral characteristics in the visible and ultra-violet regions. Humic acids can be grouped into four major types by this procedure (A, B, Rp and P types) and evidence for a classification diagram based on the values ΔlogK and RF has recently been presented (2). It is clearly important that the usefulness of this new classification should be investigated by considering other chemical and physical properties of humic acids.Keywords
This publication has 5 references indexed in Scilit:
- Humus composition of mountain soils in Central Japan with special reference to the distribution of P type humic acidSoil Science and Plant Nutrition, 1967
- The chemical nature of the green fraction of P type humic acidSoil Science and Plant Nutrition, 1967
- Studies on the colour of humic acidsSoil Science and Plant Nutrition, 1965
- Determination of Carbonyl CompoundsAnalytical Chemistry, 1959
- Elementary composition of humic acidsSoil Science and Plant Nutrition, 1955