Modelling the Role of Humic Acid in Radiocaesium Distribution in a British Upland Peat Soil

Lofts, S.; Tipping, E.W.; Sanchez, A.L.; Dodd, B.A.. 2002 Modelling the Role of Humic Acid in Radiocaesium Distribution in a British Upland Peat Soil. Journal of Environmental Radioactivity, 61. 133-147.

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The significance of exchange sites on organic matter in the retention of radiocaesium in highly organic soils remains unclear. To quantify this retention, we measured the binding of 134Cs to a humic acid isolated from a British upland peat soil, under a range of chemical conditions. We interpreted our results using Humic Ion Binding Model V, a model of humic substance chemistry which simulates ion exchange by non-specific accumulation of cations adjacent to the humic molecules. Model V could simulate the humic acid-solution partitioning of Cs under all the solution conditions used. The model was used to estimate the contribution of organic matter to Cs sorption by the whole soil composite. An estimate of Cs sorption by illite frayed edge sites was also made. These simulations show that organic matter may play only a minor role in binding Cs. even in highly organic soils.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: CEH Programmes pre-2009 publications > Other
CEH Sections/Science Areas: _ Environmental Chemistry & Pollution
ISSN: 0265-931X
Additional Keywords: radioecology, radiocaesium, humic substances, peat, adsorption
NORA Subject Terms: Ecology and Environment
Date made live: 14 Feb 2013 14:03 +0 (UTC)

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