title: Leachate Properties and Cadmium Migration Through Freeze-thaw Treated Soil Columns.
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.
authors.affiliation: Key Laboratory of Groundwater Resources and Environment Ministry of Education, College of Environment and Resources, Jilin University, Changchun, 130012, China.|Shandong Geological Sciences Institute, Jinan, 250013, China.
authors.forename: Meng
authors.initials: M
authors.lastname: Xu
authors.affiliation: Key Laboratory of Groundwater Resources and Environment Ministry of Education, College of Environment and Resources, Jilin University, Changchun, 130012, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: Key Laboratory of Groundwater Resources and Environment Ministry of Education, College of Environment and Resources, Jilin University, Changchun, 130012, China.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Chen
authors.affiliation: Key Laboratory of Groundwater Resources and Environment Ministry of Education, College of Environment and Resources, Jilin University, Changchun, 130012, China.
authors.forename: Na
authors.initials: N
authors.lastname: Mao
authors.affiliation: Key Laboratory of Groundwater Resources and Environment Ministry of Education, College of Environment and Resources, Jilin University, Changchun, 130012, China. guoping@jlu.edu.cn.
authors.forename: Ping
authors.initials: P
authors.lastname: Guo
mesh_terms: D002104:Cadmium / Q000032:analysis*; D005615:Freezing; D060587:Groundwater / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D002104:Cadmium
keywords: Cd migration; Dissolved organic matter; Freeze-thaw; Leachate properties