| Ageing of added copper in bentonite without and with humic acid | |
| Zhou, Shi-Wei1,2; Ma, Yi-Bing1; Xu, Ming-Gang1 | |
| 发表期刊 | CHEMICAL SPECIATION AND BIOAVAILABILITY
 |
| ISSN | 0954-2299 |
| 2009-08-01 | |
| 卷号 | 21期号:3页码:175-184 |
| 关键词 | Surface Nucleation Complexation Micropore Diffusion Fractionation |
| 产权排序 | Chinese Acad Agr Sci, Key Lab Plant Nutr & Nutrient Cycling, Minist Agr, Inst Agr Resources & Reg Planning;Chinese Acad Sci, Yantai Inst Coastal Zone Res Sustainable Dev |
| 通讯作者 | Zhou, SW, Chinese Acad Agr Sci, Key Lab Plant Nutr & Nutrient Cycling, Minist Agr, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China |
| 作者部门 | 生物资源实验室 |
| 英文摘要 | The ageing of metals in soils plays an important role in assessing ecological risk and soil quality criteria, it therefore is necessary to understand the ageing processes. Using a sequential extraction procedure and a parabolic diffusion equation, the ageing of added copper(Cu) in bentonite without and with humic acid (HA) was investigated as a function of incubation time over one year. At the same time, the effect of pH on Cu ageing in bentonite with HA was also studied. The most labile Cu fractions (water-soluble Cu, Cu extracted by NH(4)NO(3) and EDTA) gradually transformed into less extractable forms. The modelled diffusion equation suggested that the ageing processes were controlled by surface nucleation/precipitation and diffusion. In the presence of HA, the contribution from surface nucleation/precipitation increased significantly, whereas that from diffusion decreased, this indicated the addition of HA significantly enhanced the short-term ageing by complexation with Cu ions, but strongly inhibited the further diffusion of Cu ions into interlayer of bentonite during long-term ageing owing to the more stable complexes formed on solid surface. With increasing pH in bentonite with HA, the apparent diffusion rate coefficient (D/r(2)) increased greatly, which showed that during long-term ageing pH played an important role in reducing the extractability as a result of the significant increase in residual Cu (RES-Cu), the most inert fraction, due to micropore diffusion. |
| 文章类型 | Article |
| 资助机构 | Major State Basic Research and Development Program of China [2002CB410809]; National Natural Science Foundation of China [40571071]; State Key Laboratory of Soil and Sustainable Agriculture, China [0551000014] |
| 收录类别 | SCI |
| 语种 | 英语 |
| 关键词[WOS] | DISSOLVED ORGANIC-MATTER ; HEAVY-METALS ; NATURAL ATTENUATION ; SOILS ; FRACTIONATION ; ADSORPTION ; GOETHITE ; TIME ; ZINC ; BIOAVAILABILITY |
| 研究领域[WOS] | Biochemistry & Molecular Biology ; Environmental Sciences & Ecology ; Toxicology |
| WOS记录号 | WOS:000269736700006 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.yic.ac.cn/handle/133337/3467 |
| 专题 | 海岸带生物学与生物资源利用重点实验室_海岸带生物学与生物资源保护实验室 |
| 作者单位 | 1.Chinese Acad Agr Sci, Key Lab Plant Nutr & Nutrient Cycling, Minist Agr, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China 2.Chinese Acad Sci, Yantai Inst Coastal Zone Res Sustainable Dev, Yantai 264003, Shandong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou, Shi-Wei,Ma, Yi-Bing,Xu, Ming-Gang. Ageing of added copper in bentonite without and with humic acid[J]. CHEMICAL SPECIATION AND BIOAVAILABILITY,2009,21(3):175-184. |
| APA | Zhou, Shi-Wei,Ma, Yi-Bing,&Xu, Ming-Gang.(2009).Ageing of added copper in bentonite without and with humic acid.CHEMICAL SPECIATION AND BIOAVAILABILITY,21(3),175-184. |
| MLA | Zhou, Shi-Wei,et al."Ageing of added copper in bentonite without and with humic acid".CHEMICAL SPECIATION AND BIOAVAILABILITY 21.3(2009):175-184. |
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