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The effects of soil chemical characteristics on the super(134)Cs concentrations in earthworms. Uptake from liquid medium
Ist Teil von
Journal of environmental radioactivity, 1997-01, Vol.35 (3), p.313-330
Erscheinungsjahr
1997
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals
Beschreibungen/Notizen
The concentrations of potassium, stable cesium, calcium and ammonium in soil, and of the pH are known to affect the uptake of super(134)Cs by plants and soil organisms. It is uncertain as to which extent this is a direct effect on the uptake of super(134)Cs (e.g. through competition for binding sites) or an indirect effect through a changing distribution of the super(134)Cs between the solid and liquid phase of the soil. Studying the effect of both varying concentrations of potassium, stable cesium, calcium and ammonium and the pH on the uptake of super(134)Cs by the earthworms Eisenia fetida and Lumbricus rubellus from solution was, therefore, a means to investigate this effect. The concentrations of super(134)Cs in the earthworms were found to differ by a factor of three between the species. Highest and lowest super(134)Cs concentration differed by a factor of five within each species. Potassium affected the super(134)Cs concentration in the earthworms significantly in contrast to stable cesium. However, the effects expressed per millimole added, were comparable for both elements. The non-significance of stable cesium might have been caused by the small concentration range used. Considering the natural concentrations of potassium and stable cesium in soil solution, addition of potassium was shown to be a more realistic countermeasure. No significant effects from varying pH or calcium and ammonium concentrations were observed. The internal calcium concentration increased with increasing calcium concentration in solution, whereas the internal potassium concentration was independent of the potassium concentration in the solution.