title: Aging effect on the leaching behavior of heavy metals (Cu, Zn, and Cd) in red paddy soil.
abstract: Aging effect can influence the fractions distribution and mobility of metals after they are added into soil. In this study, incubation and soil column experiments under simulated acid rain condition were conducted to evaluate aging effect on the leaching characteristic of Cu, Zn, and Cd in artificial polluted red paddy soil. Our results showed that aging effect reduced metal contents in exchangeable and HoAc soluble fractions. Power function was the most excellent to describe the variation of exchangeable fraction, while pseudo first- and second-order functions were more successful to describe the leaching characteristic of metals from soil columns. The leaching amount of the metals from the polluted soil only accounted for a small part of their total content in soil, and the leachability of Cu was the weakest. Both the exchangeable and HoAc soluble fraction were available as indicators to evaluate the leachability of metals in red paddy soil. The shorter time the soil was contaminated, the more amounts of metals released from the soil. The reduction of exchangeable fraction caused by aging effect was the main reason for the decrease of metal mobility in soil.
authors.affiliation: College of Environmental Science and Technology, Hunan University, Changsha, 410082, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Huang
authors.forename: Zhongwu
authors.initials: Z
authors.lastname: Li
authors.forename: Jinquan
authors.initials: J
authors.lastname: Huang
authors.forename: Guiqiu
authors.initials: G
authors.lastname: Chen
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Nie
authors.forename: Wenming
authors.initials: W
authors.lastname: Ma
authors.forename: Hongbo
authors.initials: H
authors.lastname: Yao
authors.forename: Jiamei
authors.initials: J
authors.lastname: Zhen
authors.forename: Guangming
authors.initials: G
authors.lastname: Zeng
mesh_terms: D015258:Acid Rain; D002104:Cadmium / Q000032:analysis / Q000737:chemistry*; D003300:Copper / Q000032:analysis / Q000737:chemistry*; D004553:Electric Conductivity; D004787:Environmental Pollution; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*; D015032:Zinc / Q000032:analysis / Q000737:chemistry*
chemical_list: D015258:Acid Rain; D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium; D003300:Copper; D015032:Zinc
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