Abstract
Soil column leaching experiments were conducted to study the effects of multiple freeze-thaw cycles on the vertical migration of cadmium (Cd). Three Cd-spiked leaching solutions of different properties were derived from snowmelt, sludge, and straw, designated as B, W and J, respectively. The leaching solutions varied in dissolved organic matter (DOM) concentrations in the order of J > W > B. Changes in leachate properties and Cd concentration were observed. The results showed that pH values of all the leachate solutions through freeze-thaw treated soil columns were higher than those of leachates through unfrozen soils. However, electrical conductivity (EC) values decreased compared with leachates in unfrozen treated soil columns. Although the concentrations of DOM in leachate solutions had no evident differences between the freeze-thaw and unfrozen treated soil columns, the concentrations of DOM in the leachate solutions B, W and J were different. Freeze-thaw cycles resulted in increased concentrations of Cd in the leachate solutions in the order J > W > B, and promoted a deeper migration of Cd in the soil columns. Thus, it was shown that freeze-thaw cycles may increase the risk of groundwater pollution by Cd.
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The research was sole financially support by a grant from Major Science and Technology Program for Water Pollution Control and Treatment (2014ZX07201-010).
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Xu, M., Zheng, Y., Chen, W. et al. Leachate Properties and Cadmium Migration Through Freeze-thaw Treated Soil Columns. Bull Environ Contam Toxicol 98, 113–119 (2017). https://doi.org/10.1007/s00128-016-1982-5
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DOI: https://doi.org/10.1007/s00128-016-1982-5