Mineralogical and Chemical Properties and Lability of Cadmium in some Soils from Japan and Vietnam

概要

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We collected five Japanese and six Viernamese soil samples that were polluted with cadmium(Cd) and analyzed them for chamical and mineralogical properties as well as for extractability of Cd in water, 0.01molL[-1]CaCls, 0.1and6mol L[-1]HCL. The total Cd content was in a range from 3 to 16 mg kg[-1] for the Japanese samples and 0.5 to 1.1 mg/kg[-1] for Vietnamese samples. The soil samples had mixed clay mineralogy containing both the 1:1 and 2:1 type layer silicate minerals. We noticed no simple relationships among the mode of extractability in four different solutions and soil properties including clay mineralogy. The only exception was the relationship between the effective cation exchange capacity (ECEC) and the extractability for the Japanese samples. Ther regression analysis suggested that more Cd tends to reside on cation exchange sites of laayer slicate minerals as ECEC increases but it does not in increase of the extractability in the dilute CaCl2 solution.
九州大学の論文