Pedosphere 3(3): 239--246, 1993
ISSN 1002-0160/CN 32-1315/P
©1993 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of Zn Adsorption on Charge of Variable Charge Soils |
| SUN HAN-YUAN |
| Institute of Soil Science, Academia Sinica. P. O. Box 821, Nanjing 210008 |
| ABSTRACT |
| The variation in apparent charge of two typical variable charge soils resulting from Zn adsorption were studied by KC1 saturation and NH4NO3 replacement methods. Results showed that zinc were adsorbed specifically to those sites with negative charge. As in different pH ranges, the percentages of specific and electrostatic adsorptions of zinc and the mechanisms of specific adsorption were different, the effects of Zn adsorption on apparent charge were varied and could be characterized as: when 1 mmol Zn2+ was adsorbed, a change about 1 mmol in the apparent charge was observed in the low pH range (Ⅰ), 1.4 to 1.5 mmol in the moderate pH range (Ⅱ) and 0.55 to 0.6 mmol in the high pH range (Ⅲ). |
| Key Words: |
| Citation: Sun, H. Y. 1993. Effect of Zn Adsorption on Charge of Variable Charge Soils. Pedosphere. 3(3): 239-246. |
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