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DOI | 10.1097/SS.0b013e31829a3f0a |
Retention of Nickel in Soils: Sorption-Desorption and Extended X-ray Absorption Fine Structure Experiments | |
Liao, Lixia1; Roy, Amitava2; Scheckel, Kirk G.3; Merchan, Gregory2; Selim, H. Magdi1 | |
发表日期 | 2013-05-01 |
ISSN | 0038-075X |
卷号 | 178期号:5页码:215-221 |
英文摘要 | Adsorption and desorption of heavy metals in soils are primary factors that influence their bioavailability and mobility in the soil profile. To examine the characteristics of nickel (Ni) adsorption-desorption in soils, kinetic batch experiments were carried out followed by Ni release using successive dilutions. Two soils of distinctly different properties were used: one acidic (Olivier) and one neutral (Webster) soil, where a wide-range Ni concentration was implemented. Adsorption of Ni by both soils was kinetic and increased with increasing initial (input) Ni concentration. The rate of sorption was initially rapid and was followed by gradual retention over time. A sequential extraction procedure and extended X-ray absorption fine structure (EXAFS) spectroscopy were implemented to characterize Ni kinetic sorption behavior. Five sequential extractions were quantified: exchangeable, bound to carbonates, bound to Fe-Mn oxides, bound to organic matter, and residual fraction. The exchangeable fraction showed a slight increase as initial Ni concentration increased, indicating weakly bound Ni adsorption complexes. Extended X-ray absorption fine structure analyses indicated that Ni hydroxide precipitate formed over time for the neutral Webster soil. This precipitate was likely bound to the Fe/Al oxide fraction. We conclude, based on EXAFS analyses and sequential extractions, formation of Ni hydroxide precipitate depends on soil pH and the amount of Ni sorbed. No Ni hydroxide precipitate was formed on the acidic Olivier soil. |
英文关键词 | Adsorption;kinetics;nickel |
语种 | 英语 |
WOS记录号 | WOS:000330319600001 |
来源期刊 | SOIL SCIENCE |
来源机构 | 美国环保署 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/58832 |
作者单位 | 1.Louisiana State Univ, Sch Plant Environm & Soil Sci, Baton Rouge, LA 70803 USA; 2.Louisiana State Univ, Ctr Adv Microstruct & Devic, Baton Rouge, LA 70803 USA; 3.US EPA, Natl Risk Management Res Lab, Cincinnati, OH USA |
推荐引用方式 GB/T 7714 | Liao, Lixia,Roy, Amitava,Scheckel, Kirk G.,et al. Retention of Nickel in Soils: Sorption-Desorption and Extended X-ray Absorption Fine Structure Experiments[J]. 美国环保署,2013,178(5):215-221. |
APA | Liao, Lixia,Roy, Amitava,Scheckel, Kirk G.,Merchan, Gregory,&Selim, H. Magdi.(2013).Retention of Nickel in Soils: Sorption-Desorption and Extended X-ray Absorption Fine Structure Experiments.SOIL SCIENCE,178(5),215-221. |
MLA | Liao, Lixia,et al."Retention of Nickel in Soils: Sorption-Desorption and Extended X-ray Absorption Fine Structure Experiments".SOIL SCIENCE 178.5(2013):215-221. |
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