Arsenic Adsorption and its Fractions on Aquifer Sediment: Effect of pH, Arsenic Species, and Iron/Manganese Minerals
文献类型：SCI/SSCI论文
| 作者 | Ma J.; Guo, H. M.; Lei, M.; Zhou, X. Y.; Li, F. L.; Yu, T.; Wei, R. F.; Zhang, H. Z.; Zhang, X.; Wu, Y. |
| 发表日期 | 2015 |
| 关键词 | Arsenic Adsorption Fraction Aquifer sediments pH Arsenic species Fe/Mn minerals sequential extraction procedure zero-valent iron aqueous-solution contaminated soils removal oxidation sorption groundwater goethite speciation |
| 英文摘要 | Effects of pH, As species, and Fe/Mn minerals on the fractions of adsorbed As in aquifer sediments were evaluated. Kinetic data showed that As adsorption was controlled by diffusion through the external film. Isothermal data of both As(III) and As(V) fitted the Langmuir isotherm well, revealing a monolayer adsorption process. Sequential extraction demonstrated that water-soluble As and non-specifically sorbed As were the major fractions of adsorbed As. Assessing the relationship between the Freundlich K-F and the increases in the amounts of As fractions showed that the pH played a key role in weakly adsorbed As, especially water-soluble As. Although inorganic As species converted each other during the adsorption processes, more non-specifically sorbed As was adsorbed in As(V)-treated sediment than in As(III)-treated sediment, showing that the electrostatic selectivity controlled the non-specific adsorption. Additionally, specifically sorbed As and As associated with the amorphous phases were predominated by Fe/Mn minerals, especially Fe(III) (hydr) oxides. These results suggested that pH, As species, and Fe/Mn minerals would regulate the As fractions in aquifer sediments, and therefore control As cycling in aquifer systems. |
| 出处 | Water Air and Soil Pollution |
| 卷 | 226 |
| 期 | 8 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0049-6979 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/38772]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Ma J.,Guo, H. M.,Lei, M.,et al. Arsenic Adsorption and its Fractions on Aquifer Sediment: Effect of pH, Arsenic Species, and Iron/Manganese Minerals. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
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