Pedosphere 6(3): 225--231, 1996
ISSN 1002-0160/CN 32-1315/P
©1996 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| pH effect on kinetics of heavy metal sorption in soils |
| LIN Yu-Suo1 and XUE Jia-Hua2 |
1 Nanjing Institute of Environmental Scienpe, Notional Environmental Protection, Agency, Nanjing 210042 (China)
2 Nanjing Agricultural University, Nanjing 210014 (China) |
| ABSTRACT |
| The pH effect on the sorption kinetics of heavy metals in soils was studied using a constant flow leaching method. The soil samples were red soil collected from Yingtan, Jiangxi, and yellow-brown soil from Nanjing, Jiangsu. The heavy metals tested were zinc and cadmium. Assuming that the experimental data fitted to the following kinetic rate equation: 1/c·dx/dt = kx∞-kx, the rate constant k of sorption could be determined from the slope of the straight line by plotting of 1/c·dx/dt vs. x. The results showed that the pH effect on the rate constants of heavy mental sorption in soils was very significant. The values of k decreased with increasing pH. The sorptions were more sensitive to pH in red soil than in yellow-brown soil. |
| Key Words: heavy metals, kinetics, soils, sorption |
| Citation: Lin, Y. S. and Xue, J. H. 1996. pH effect on kinetics of heavy metal sorption in soils. Pedosphere. 6(3): 225-231. |
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