期刊
ENVIRONMENTAL POLLUTION
卷 213, 期 -, 页码 878-887出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2016.03.023
关键词
TI contamination; Pb isotope; Pyrite; Binary model
资金
- National Natural Science Foundation of China [41203002, 41573008, 41573119, 41303007, 41273100, U1501231, 41372364]
- Guangdong Provincial Natural Science Foundation [2014A030313527, 2015A030313512]
- Environmental Protection Ministry of Public Welfare Research Projects [201509051]
- Guangzhou Science and Technology Programme [201510010205]
- Guangzhou Education Bureau [2012A026, 1201431072, 13XT02]
- Taiwan MOST [104-2119-M-002-003]
- National Taiwan University [105R7625]
Thallium (Tl) is a non-essential element in humans and it is considered to be highly toxic. In this study, the contents, sources, and dispersal of Tl were investigated in surface sediments from a riverine system (the western Pearl River Basin, China), whose catchment has been contaminated by mining and roasting of Tl-bearing pyrite ores. The isotopic composition of Pb and total contents of Tl and other relevant metals (Pb, Zn, Cd, Co, and Ni) were measured in the pyrite ores, mining and roasting wastes, and the river sediments. Widespread contamination of Tl was observed in the sediments across the river, with the highest concentration of Tl (17.3 mg/kg) measured 4 km downstream from the pyrite industrial site. Application of a modified Institute for Reference Materials and Measurement (IRMM) sequential extraction scheme in representative sediments unveiled that 60-90% of Tl and Pb were present in the residual fraction of the sediments. The sediments contained generally lower Pb-206/Pb-207 and higher Pb-208/Pb-206 ratios compared with the natural Pb isotope signature (1.2008 and 2.0766 for Pb-206/Pb-207 and Pb-208/Pb-206, respectively). These results suggested that a significant fraction of non-indigenous Pb could be attributed to the mining and roasting activities of pyrite ores, with low Pb-206/Pb-207 (1.1539) and high Pb-208/Pb-206 (2.1263). Results also showed that approximately 6-88% of Tl contamination in the sediments originated from the pyrite mining and roasting activities. This study highlights that Pb isotopic compositions could be used for quantitatively fingerprinting the sources of Tl contamination in sediments. (C) 2016 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据