Abstract
The Windermere Humic Aqueous Model (WHAM) is tested with the data from laboratory experiments on three acid soils from the British Uplands. The model is reasonably successful at blind-predicting values of K D (solid-solution distribution coefficients) of Co, Sr, and Am on the basis of their interactions with soil humic matter. The competitive effects of aluminum are calculated to exert a strong influence on trace element binding. Organic matter interactions only explain the data for Cs in the case of the most organic-rich soil; the K D values are substantially underestimated in the other cases, presumably reflecting the presence in the soils of minerals bearing sites with high specificity toward Cs + . Calculations for soils in situ show the importance of binding by dissolved organic matter in determining the K D values for strongly complexed radionuclides such as Th and Am
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