Pedosphere 7(2): 185--192, 1997
ISSN 1002-0160/CN 32-1315/P
©1997 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Factors affecting Cr(Ⅲ) oxidation by manganese oxides |
| CHEN Ying-Xu, CHEN Yi-Yi, LIN Qi, HU Zi-Qiang, HU HONG and WU Jian-Yang |
| Dept. of Environ. Sci., Zhejiang Agricultural Univereity, Hangzhou, 310029 (China) |
| ABSTRACT |
| The high oxidation ability of manganese oxides or soils was used to study effects of pH and coating on Cr(Ⅲ) oxidation. The results indicated that Cr(Ⅲ) oxidation peaked in pH 4.0~6.5. The amount and rate of Cr(Ⅲ) being oxidized by uncoated δ-MnO2 were larger than those by Fe oxide- or CaCO3-coated one. Inorganic Cr(Ⅲ) was more easily oxidized by MnO2 than organic complex Cr(Ⅲ) due to different surface affinities. Precipitated Cr(Ⅲ) and adsorbed Cr(Ⅲ) might be transferred onto MnO2 surface and then oxidized to Cr(Ⅵ). |
| Key Words: chromium, environmental chemistry kinetics, manganese oxides, oxidation |
| Citation: Chen, Y. X., Chen, Y. Y., Lin, Q., Hu, Z. Q., Hu, H. and Wu, J. Y. 1997. Factors affecting Cr(Ⅲ) oxidation by manganese oxides. Pedosphere. 7(2): 185-192. |
|
View Full Text
|
|
|
|
