Influence of pH Change on Cd Leachability and Chemical Forms of Contaminated Soil
1998 年 42 巻 1 号 p. 57-61
詳細
1998 年 42 巻 1 号 p. 57-61
The influence of pH change on Cd leachability and chemical forms of contaminated soil was investigated. Results of sequential extraction of soil Cd showed that more than 70% of the total Cd in the contaminated soil was associated with the exchangeable, inorganically-bound and organically-bound fractions, suggesting that most of Cd are mobile in soil. As the pH of soils decreased, the water-soluble Cd contents increased remarkably. The increase of the water-soluble Cd was mainly from the exchangeable and inorganically-bound fractions, and also a part from the organically-bound, oxide-occluded and residual fractions. It was concluded when soil becomes acid, not only Cd in the fractions which equilibrated with solution desorpted, but also that some Cd dissolved from oxide-occluded and residual fractions, which must be released from the destruction of oxides and mineral.
