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Title: Water colour and humic charge 1st interim report
Author: E. Tipping
Author: C. Woof
Document Type: Monograph
The objective of this work is to investigate the possible relationship between the net electrical charge on soil humic substances (HS) and the concentration of HS dissolved in the soil solution. The starting hypothesis is that the greater is the net charge (Z), the greater is the humic "solubility". Preliminary work of the authors' report suggests that there may be a direct relationship between Z and solution [HS]. If so, it may be possible to make quantitative predictions of the concentration of HS in drainage waters, and how that concentration may change with climate, land-use etc. Since dissolved HS are major contributors to perceived "water colour", this would be useful in the management of peaty catchments and their reservoirs. The data required in this investigation are from bulk analyses of soil samples and from acid-base titration experiments with the soils. This interim report presents data obtained for the first 13 soil samples (there will be 30 in all), and comments on the major observed trends in the data. Calculations of Z take into account the binding protons, Al species and divalent base cations (Mg2+ , Ca2+ ) by HS , and are performed with the organic soil model "CHAOS". These calculations will most conveniently be carried out when the complete data set is available.
Publisher: Freshwater Biological Association
Publication Date: 1988
Publication Place: Ambleside
Subject Keywords: Soil chemistrySoil analysisHumusColourTitrimetrySamplingSoil propertiesModellingCationsDissolved organic carbon
Geographic Keywords: EnglandWales
Extent: 27
Total file downloads: 173

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