Pedosphere 9(4): 357--362, 1999
ISSN 1002-0160/CN 32-1315/P
©1999 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Study on mechanisms of Cd2+ sorption on goethite by microcalorimetry |
| ZHANG Gui-Yin1,2, WANG Tian-Zhi3, DONG Yuan-Yan1 and LI Xue-Yuan1 |
1 Huazhong Agricultural University, Wuhan 43OO7O (China);
2 Agricultural University of Hebei, Baoding 071001 (China);
3 Wuhan University, Wuhan 450072 (China) |
| ABSTRACT |
| A study on energy changes and mechanisms of Cd sorbed on goethite was performed using the technique of microcalorimetry. The data of the amount of Cd sorption (Aq) and concentration of Cd in equilibrium solution (Ce), and the data of Aq and the heat effect (AH) caused by Cd2+ sorption on goethite all fitted Langmuir isotherm. The amount of heat released from Cd sorption on goethite increased with the amount of Ce or Aq. The reaction process of Cd sorption on goethite may be divided into five stages and three plateaus, depending on the variation of enthalpy change (ΔaHm) of Cd sorption with Aq, which implied three mechanisms of interaction between Cd and goethite. The experimental results showed that the microcalorimetry may be useful for determination of microcalorie variation in soil. |
| Key Words: cadmium, goethite, heat effect, microcalorimetry, sorption |
| Citation: Zhang, G. Y., Wang, T. Z., Dong, Y. Y. and Li, X. Y. 1999. Study on mechanisms of Cd2+ sorption on goethite by microcalorimetry. Pedosphere. 9(4): 357-362. |
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