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| Effects of Ionic Strength and pH on Colloid Release from Different Soils |
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| KeyWord:soil colloid; release; ionic strength; pH; disturbed column; undisturbed column |
| Author Name | Affiliation | | LV Xue-yan | Key Laboratory of Surficial Geochemisty, Ministry of Education, School of Earth Sciences and Engineering, Department of Hydrosciences, Nanjing University, Nanjing 210023, China | | YAO Yao | Key Laboratory of Surficial Geochemisty, Ministry of Education, School of Earth Sciences and Engineering, Department of Hydrosciences, Nanjing University, Nanjing 210023, China | | SUN Yuan-yuan | Key Laboratory of Surficial Geochemisty, Ministry of Education, School of Earth Sciences and Engineering, Department of Hydrosciences, Nanjing University, Nanjing 210023, China | | WU Ji-chun | Key Laboratory of Surficial Geochemisty, Ministry of Education, School of Earth Sciences and Engineering, Department of Hydrosciences, Nanjing University, Nanjing 210023, China | | GUO Hong-yan | School of Environment, State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing 210023, China |
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| Abstract: |
| Colloid mobilization would facilitate pollutant transport in the environment. In laboratory, leaching experiments were performed to investigate the effects of ionic strength and pH on colloid release from undisturbed and disturbed Wushan soil columns from Changshu, disturbed black soil column from northeast China（Dongbei） and disturbed red soil column from Jiangxi. The effects of ionic strength on colloid release were significantly different in various soils. In the electrolyte NaCl system, increasing ionic strength obviously reduced the release capacity of soil colloids for Changshu Wushan soil and Dongbei black soil, while ionic strength had little effects on collois release in Jiangxi red soil. In electrolyte CaCl2 system, however, ionic strength had no significant impacts on soil collois release. Moreover, colloid release was much smaller in CaCl2 than in NaCl. Under the same conditions of solution chemistry, the amount of colloid released was far greater in Changshu Wushan soil and Dongbei black soil than in Jiangxi red soil. pH showed little influence on colloid release. The research findings would be useful for further understanding the impacts of water chemical conditions on colloid release of different soils. |
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