Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s11368-017-1730-4 |
Influence of pH on the release and chemical fractionation of heavy metals in sediment from a suburban drainage stream in an arid mine-based oasis | |
Zang, Fei1,2; Wang, Shengli1,2; Nan, Zhongren1,2; Ma, Jianmin1,2; Wang, Yu1,2; Chen, Yazhou1,2; Zhang, Qian1,2; Li, Yepu1,2 | |
通讯作者 | Wang, Shengli |
来源期刊 | JOURNAL OF SOILS AND SEDIMENTS |
ISSN | 1439-0108 |
EISSN | 1614-7480 |
出版年 | 2017 |
卷号 | 17期号:10页码:2524-2536 |
英文摘要 | Purpose The objectives of this study were to explore the influences of pH on the release of Cu, Zn, Cd, Pb, Ni, and Cr in sediments derived from the upstream, middle, and downstream reaches of Dongdagou stream in Gansu Province, Northwest China, and to examine the fractionation changes of heavy metals in the sediments after reaching their release equilibrium under different pH conditions. Materials and methods Sediment samples were obtained using a stainless steel grab sampler to collect the uppermost 10 cm of sediment from the channel bed. The pH-dependent release experiment was conducted in the solid-to-liquid ratio of 1:20 at different pH values (2, 4, 6, 8, 10, and 12) at room temperature. The total Cu, Zn, Cd, Pb, Ni, and Cr concentrations in the sediments were digested using an acid digestion mixture (HNO3 + HF + HClO4) in an open system. Metal fractionation of selected sediments was obtained using the Tessier sequential extraction procedure. Heavy metal concentrations in the samples were determined using atomic absorption spectrophotometry. Results and discussion The mean concentrations of heavy metals in sediments decreased in the following order: Zn (1676.67 mg kg(-1)) > Pb (528.65 mg kg(-1)) > Cu (391.34 mg kg(-1)) > Cr (53.48 mg kg(-1)) > Ni (34.27 mg kg(-1)) > Cd (11.53 mg kg(-1)). Overall, the solubility of Cu, Zn, Cd, Pb, and Ni decreased with increasing pH, and they were strongly released at pH 2. Moreover, the solubility of Cr increased with increasing pH, and its release was highest at pH 12. After reaching the release equilibrium of heavy metals under different pH conditions, the percentages of organic Cu, Zn, Cd, and Fe-Mn oxyhydroxide Pb decreased, compared to their initial fractions. The residual fractions of Ni and Cr were dominant, regardless of pH. Conclusions The average concentrations of Cu, Zn, Cd, and Pb in sediments were highly elevated compared with the soil background values in Gansu Province, China. The results of this pH-dependent release experiment showed that the release behaviors of Cu, Zn, Pb, and Cr followed an asymmetric V-shaped pattern, whereas Cd and Ni followed an irregular L-shaped pattern. The changes in the release of heavy metals in sediments were related to their redistribution between chemical fractionations. |
英文关键词 | Heavy metal Industrial oasis pH Release Sediment Fractionation |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000410484300014 |
WOS关键词 | SEQUENTIAL EXTRACTION PROCEDURE ; TRACE-ELEMENTS ; CONTAMINATED SEDIMENTS ; PARTICULATE MATTER ; BOTTOM SEDIMENTS ; DREDGED SEDIMENT ; MARINE-SEDIMENTS ; ECOLOGICAL RISK ; RIVER SEDIMENT ; SOILS |
WOS类目 | Environmental Sciences ; Soil Science |
WOS研究方向 | Environmental Sciences & Ecology ; Agriculture |
来源机构 | 兰州大学 |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/200804 |
作者单位 | 1.Lanzhou Univ, Coll Earth & Environm Sci, Gansu Key Lab Environm Pollut Predict & Control, Lanzhou 730000, Gansu, Peoples R China; 2.Lanzhou Univ, Coll Earth & Environm Sci, Lanzhou 730000, Gansu, Peoples R China |
推荐引用方式 GB/T 7714 | Zang, Fei,Wang, Shengli,Nan, Zhongren,et al. Influence of pH on the release and chemical fractionation of heavy metals in sediment from a suburban drainage stream in an arid mine-based oasis[J]. 兰州大学,2017,17(10):2524-2536. |
APA | Zang, Fei.,Wang, Shengli.,Nan, Zhongren.,Ma, Jianmin.,Wang, Yu.,...&Li, Yepu.(2017).Influence of pH on the release and chemical fractionation of heavy metals in sediment from a suburban drainage stream in an arid mine-based oasis.JOURNAL OF SOILS AND SEDIMENTS,17(10),2524-2536. |
MLA | Zang, Fei,et al."Influence of pH on the release and chemical fractionation of heavy metals in sediment from a suburban drainage stream in an arid mine-based oasis".JOURNAL OF SOILS AND SEDIMENTS 17.10(2017):2524-2536. |
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