Sulfur Speciation in the Surface Sediments of Lakes from Different Regions, China: Characterization by S K-Edge XANES Spectroscopy
Sulfur Speciation in the Surface Sediments of Lakes from Different Regions, China: Characterization by S K-Edge XANES Spectroscopy
复制标题
中国不同地区湖泊表层沉积物中的硫形态：SK-Edge XANES 光谱表征
DOI：
10.1155/2016/3672348
复制
发表时间：
2016-05
影响因子：
3
通讯作者：
Ma Chenyan
中科院分区：
文献类型：
--
作者：
Chen Jingan;Dai Zhihui;Yang Haiquan;Ma Chenyan
X射线吸收近边结构(XANES)光谱为确定元素S在水生态系统中的氧化还原状态提供了机会。然而，S XANES光谱在陆地水生态系统中的研究相对较少。本研究利用XANES技术对太湖、青海湖、滇池、草海、红枫湖等不同地质背景区域的沉积物中S的形态变化进行了研究。结果表明，由于流域岩石的物理风化作用，青海湖沉积的S含有较高比例的硫酸盐，平均为88.9%，而太湖沉积的S含有较高比例的中间体S(36.5%)，这可能是流域农业面源污染的反应。位于中国西南部的三个湖泊具有相似的S物种组成特征，表明S的物源相似，包括碳酸盐的化学风化和大气沉积。表层沉积物中S化合物的60-90%以硫酸盐和FeS的形式存在。在更深层，FeS_2与中间体S的比值显著增加，表明硫酸盐还原和硫化物再氧化过程随着深度的增加而加快。
X-ray absorption near edge structure (XANES) spectroscopy affords the opportunity to determine redox status for element S in the aquatic ecosystems. However, there have been relatively few studies of S XANES spectroscopy in the terrestrial aquatic ecosystems. In this study, XANES technology was used to examine changes in S speciation in the sediments collected from Taihu Lake, Qinghai Lake, Dianchi Lake, Caohai Lake, and Hongfeng Lake located in distinct geological background areas of China. The results showed that sedimentary S in Qinghai Lake has a high proportion of sulfate averaged 88.9% due to physical weathering of watershed rocks, while deposited S in Taihu Lake has a high fraction of intermediate S (36.5%), which may be the response of the agricultural nonpoint source pollution in drainage basin. The three lakes located in Southwest China have similar composition characteristics of S species, indicating similar S sources including chemical weathering of carbonate and atmospheric deposition. 60–90% of S compounds in the surface sediments were in the form of sulfate and FeS. In deeper layers, the ratio of FeS2 and the intermediate S significantly increased, suggesting rapid processes of sulfate reduction and sulfide reoxidation with the increasing depths.
登录
查看更多内容
影响因子：
4
作者：
M. Dornblaser;A. Giblin;B. Fry;B. Peterson
通讯作者：
M. Dornblaser;A. Giblin;B. Fry;B. Peterson
影响因子：
5
作者：
Risgaard-Petersen, Nils;Revil, Andre;Nielsen, Lars Peter
通讯作者：
Nielsen, Lars Peter
影响因子：
5
作者：
BERNER, RA;RAISWELL, R
通讯作者：
RAISWELL, R
影响因子：
6.9
作者：
Aimin Zhou;Dong-sheng Wang;Hong-xiao Tang
通讯作者：
Aimin Zhou;Dong-sheng Wang;Hong-xiao Tang
青藏高原东北部青海湖流域化学风化对水化学的限制：来自Sr及其同位素地球化学的线索
影响因子：
2.8
作者：
Shi, Yuewei;Wang, Sumin;Yu, Jimin;You, Chen-Feng;Zhang, Fei;Jin, Zhangdong
通讯作者：
Jin, Zhangdong