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Speciation and Transformation of Sulfur in Freshwater Sediments: a Case Study in Southwest China
Jingfu Wang;  Jingan Chen;  Jianyang Guo;  Zhihui Dai;  Haiquan Yang;  Yilong Song
2017
发表期刊Water, Air, & Soil Pollution
卷号228期号:10
摘要

Sulfur (S) is one of the most redox-sensitive elements and has a marked impact on the geochemical cycling of biogenic elements in freshwater sediments. Current understanding of the speciation of sedimentary S, and of the processes regulating it, is insufficient. In this study, the speciation and spatial variations of S and iron (Fe) in sediments (soils) from Lake Hongfeng, one of the largest freshwater lakes in Southwest China, were investigated using X-ray absorption near-edge structure (XANES) spectroscopy and diffusive gradient in thin film technique (DGT). The results show that S in sediments and soils was composed of seven fractions in different electronic oxidation states (EOSs), including (i) reduced S (R-S, G1, EOS = -1), (ii) lowly oxidized S (LO-S, including G2-G5; EOS = 0, 0.5, 2, and 3.7), and (iii) highly oxidized S (HO-S, including G6 and G7; EOS = 5 and 6). Proportional differences of S speciation in sediments and soils indicated that HO-S is largely reduced to LO-S and R-S during depositional processes. The HO-S fraction decreased in the top surface sediments and then increased in the deeper layers, whereas the R-S fraction showed the opposite trend, suggesting that sulfate reduction and re-oxidation processes occurred in the sediments. High ratios of soluble Fe/S provided a favorable foundation for the reduction and burial of sedimentary S. The speciation and spatial variations of S in freshwater sediments are controlled by complex environmental factors, including terrigenous material discharges, water redox conditions, and porewater chemistry (such as for pH, Eh, and reactive Fe). Our study will help to deepen the understanding of the geochemical dynamics of S in the sediments of freshwater ecosystems.

关键词Sulfur Iron K-edge Xanes Dgt Freshwater Sediments
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/7726
专题环境地球化学国家重点实验室
作者单位1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, People’s Republic of China
2.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, People’s Republic of China
3.Institute of Surface Earth System Science, Tianjin University, Tianjin 300072, People’s Republic of China
第一作者单位中国科学院地球化学研究所
通讯作者单位中国科学院地球化学研究所
推荐引用方式
GB/T 7714
Jingfu Wang;Jingan Chen;Jianyang Guo;Zhihui Dai;Haiquan Yang;Yilong Song. Speciation and Transformation of Sulfur in Freshwater Sediments: a Case Study in Southwest China[J]. Water, Air, & Soil Pollution,2017,228(10).
APA Jingfu Wang;Jingan Chen;Jianyang Guo;Zhihui Dai;Haiquan Yang;Yilong Song.(2017).Speciation and Transformation of Sulfur in Freshwater Sediments: a Case Study in Southwest China.Water, Air, & Soil Pollution,228(10).
MLA Jingfu Wang;Jingan Chen;Jianyang Guo;Zhihui Dai;Haiquan Yang;Yilong Song."Speciation and Transformation of Sulfur in Freshwater Sediments: a Case Study in Southwest China".Water, Air, & Soil Pollution 228.10(2017).
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