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Effects of low-molecular-weight organic acids and residence time on desorption of Cu, Cd, and Pb from soils
文献类型：期刊论文
| 作者 | Qin, F; Shan, XQ; Wei, B |
| 刊名 | CHEMOSPHERE
 |
| 出版日期 | 2004 |
| 卷号 | 57期号:4页码:253-263 |
| 关键词 | desorption low-molecular-weight organic acids residence time heavy metals |
| 英文摘要 | Effects of low-molecular-weight organic acids (LMWOAs) and residence time on desorption of Cu, Cd, and Pb from two typical Chinese soils were studied. Citric, malic, and acetic acids were chosen as representatives of LMWOAs commonly present in soils. CaCl2 and NaNO3 were used in desorption as they were main soil background electrolytes for comparison. Desorption of Cu, Cd, and Pb from both soils followed the descending order: citric acid > malic acid > acetic acid > CaCl2 > NaNO3, which was consistent with the order of stability of Cu-, Cd-, and Pb-LMWOAs complexes from large to small and ion exchange ability of Ca2+ and Na+. Desorption of metals by inorganic salts decreased with increasing desorption solution pH. Whereas desorption of metals by LMWOAs showed different trend in response to pH change due to their different complexing abilities. Malic and acetic acids released less metals at low pH 3.1 compared with citric acid at pH 7, indicating that pH was not the dominant factor governing the release of metals. In addition, all LMWOAs desorbed more metals than inorganic salts, CaCl2 and NaNO3. Therefore, organic ligands played a dominant role in desorption of heavy metals. More metals were released from Jiangxi soil than from Heilongjiang soil due to lower soil pH, CEC, organic matter content and manganese oxide of Jiangxi soil. Generally, desorption of metals decreased with increasing residence time of metals in soils. (C) 2004 Elsevier Ltd. All rights reserved. |
| 研究领域[WOS] | Environmental Sciences & Ecology |
| WOS记录号 | WOS:000223681200002 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/23444]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Qin, F,Shan, XQ,Wei, B. Effects of low-molecular-weight organic acids and residence time on desorption of Cu, Cd, and Pb from soils[J]. CHEMOSPHERE,2004,57(4):253-263. |
| APA | Qin, F,Shan, XQ,&Wei, B.(2004).Effects of low-molecular-weight organic acids and residence time on desorption of Cu, Cd, and Pb from soils.CHEMOSPHERE,57(4),253-263. |
| MLA | Qin, F,et al."Effects of low-molecular-weight organic acids and residence time on desorption of Cu, Cd, and Pb from soils".CHEMOSPHERE 57.4(2004):253-263. |
入库方式： OAI收割
来源：生态环境研究中心
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