Mechanism and kinetics of aluminum dissolution during copper sorption by acidity paddy soil in South China.

Autor: Liu P; College of Sciences, Nanjing Agricultural University, Nanjing 210095, China. Electronic address: liupeiya1990@163.com., Li Y; College of Sciences, Nanjing Agricultural University, Nanjing 210095, China., Wen Q; College of Sciences, Nanjing Agricultural University, Nanjing 210095, China., Dong C; College of Sciences, Nanjing Agricultural University, Nanjing 210095, China. Electronic address: dongcx@njau.edu.cn., Pan G; Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China.
Jazyk: angličtina
Zdroj: Journal of environmental sciences (China) [J Environ Sci (China)] 2015 Aug 01; Vol. 34, pp. 100-6. Date of Electronic Publication: 2015 Jun 03.
DOI: 10.1016/j.jes.2015.02.008
Abstrakt: Soil aggregates were prepared from a bulk soil collected from paddy soil in the Taihu Lake region and aluminum (Al) dissolution, solution pH changes during copper (Cu(2+)) sorption were investigated with static sorption and magnetic stirring. Kinetics of Cu(2+) sorption and Al dissolution were also studied by magnetic stirring method. No Al dissolution was observed until Cu(2+) sorption was greater than a certain value, which was 632, 450, 601 and 674 mg/kg for sand, clay, silt, and coarse silt fractions, respectively. Aluminum dissolution increased with increasing Cu(2+) sorption and decreasing solution pH. An amount of dissolved Al showed a significant positive correlation with non-specific sorption of Cu(2+) (R(2)>0.97), and it was still good under different pH values (R(2)>0.95). Copper sorption significantly decreased solution pH. The magnitude of solution pH decline increased as Cu(2+) sorption and Al dissolution increased. The sand and clay fraction had a less Al dissolution and pH drop due to the higher ferric oxide, Al oxide and organic matter contents. After sorption reaction for half an hour, the Cu(2+) sorption progress reached more than 90% while the Al dissolution progress was only 40%, and lagged behind the Cu(2+) sorption. It indicated that aluminum dissolution is associated with non-specific sorption.
(Copyright © 2015. Published by Elsevier B.V.)
Databáze: MEDLINE
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