Pedosphere 1(4): 325--332, 1991
ISSN 1002-0160/CN 32-1315/P
©1991 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Chemical Behavior of Chromium in Soils: Ⅲ. Mechanism of Cr(Ⅵ) Adsorption by Soils |
| CHEN YING-XU, ZHU ZU-XIANG, HE ZENG-YAO |
| Zhejiang Agricultural University, Hangzhou 310029 |
| ABSTRACT |
| An analysis of Cr (Ⅵ)-sorbed surface of the soils by using a scanning electron microscope and an electron probe microscope has proved that aluminium is the chief element affecting Cr (Ⅵ) adsoption. As the ionic strength of the solution increased, the amounts of Cr (Ⅵ) adsorbed by goethite and soils decreased. Cr (Ⅵ) adsorption was greatly depressed in the presence of SO42-, WO42-, MoO42-, HPO42- and H2PO4- which competed for anion adsorption sites. The depressing extent of these anions was found to follow the sequence: HPO42-, H2PO4->MoO42->WO42->SO42->>Cl-, NO3-. The amounts of Cr (Ⅵ) desorption varied with different extractants. |
| Key Words: |
| Citation: Chen, Y. X., Zhu, Z. X. and He, Z. Y. 1991. Chemical Behavior of Chromium in Soils: Ⅲ. Mechanism of Cr(Ⅵ) Adsorption by Soils. Pedosphere. 1(4): 325-332. |
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