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High resolution spatiotemporal sampling as a tool for comprehensive assessment of zinc mobility and pollution in sediments of a eutrophic lake.

Authors
  • Jin, Zengfeng1
  • Ding, Shiming2
  • Sun, Qin3
  • Gao, Shuaishuai1
  • Fu, Zhen4
  • Gong, Mengdan5
  • Lin, Juan1
  • Wang, Dan6
  • Wang, Yan7
  • 1 State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China. , (China)
  • 2 State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China. Electronic address: [email protected] , (China)
  • 3 Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China. , (China)
  • 4 State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; Nanjing University of Science and Technology, Nanjing 210094, China. , (China)
  • 5 State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China. , (China)
  • 6 Shanghai Waterway Engineering Design and Consulting Co., Ltd., Shanghai 200120, China. , (China)
  • 7 State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; Nanjing EasySensor Environmental Technology Co., Ltd, Nanjing 210018, China. , (China)
Type
Published Article
Journal
Journal of hazardous materials
Publication Date
Feb 15, 2019
Volume
364
Pages
182–191
Identifiers
DOI: 10.1016/j.jhazmat.2018.09.067
PMID: 30366240
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

To assess zinc (Zn) pollution risk from sediments, this study investigated the monthly changes of dissolved Zn and labile Zn in sediment-overlying water profiles in a eutrophic bay (Meiliang Bay) of Lake Taihu (China) using high-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) at a 4 mm vertical resolution. In February and March, Mn oxides reduction caused high concentrations of DGT-labile Zn (14 ∼ 235 μg L-1), as evidenced by the significant correlation between DGT-labile Zn and DGT-labile Mn in sediments. In June and July, algal blooms reduced concentrations of dissolved Zn via algal assimilation. From August through October, concentrations of dissolved Zn in overlying water (338 ∼ 1023 μg L-1) exceeded the water quality limit for fisheries in China (100 μg L-1). This was attributed to reductive dissolution of Mn oxides in sediments caused by algal degradation followed by complexation of dissolved organic matter (DOM), which was identified in a simulated algal bloom experiment. In the winter, decreased Zn mobility was mainly attributed to adsorption by Mn oxides. It was concluded that enhanced Zn pollution risk from sediments is worthy of concern especially during algal degradation in eutrophic lakes. Copyright © 2018 Elsevier B.V. All rights reserved.

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