Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 670, Issue -, Pages 361-368Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.03.167
Keywords
Lake sediments; Algal blooms; Submerged macrophytes; Zinc pollution; High-resolution techniques
Categories
Funding
- Natural Science Foundation of China [41701568, 41621002, BK20171518, 41571465]
- Natural Science Foundation of Jiangsu Province [41701568, 41621002, BK20171518, 41571465]
- CAS Interdisciplinary, Innovation Team, and Research Instrument and Equipment, and Development Project of the Chinese Academy of Sciences [YJKYYQ20170016]
- One-Three-Five Strategic Planning of Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences [NIGLAS2017GH05]
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Zinc (Zn) contamination in lake zones dominated by algae and macrophytes in Lake Taihu was analyzed through diffusive gradient in thin films (DGT) and dialysis (HR-Peeper) methods. It was found that in both zones Zn contamination varied by season. In July and October, dissolved Zn was present in high concentrations, and in July, high concentrations of labile Zn were found in sediments. In July, reductive dissolutions of Fe/Mn oxides likely played a key role in the release of Zn, which was confirmed by both zones having the lowest percentage of the reducible fraction of Zn in July. Complexation of dissolved organic matter (DOM) with Zn may be responsible for the observed increase in the dissolved Zn concentration in October. This conclusion was supported by noting that October had the highest percentages of Zn-DOM complexes (25.3% and 34.4%) in the algae- and macrophytes-dominated zones, respectively. However, in January, low dissolved and labile Zn contents were observed in sediments in the two zones, suggesting that the decrease of Zn in sediments was caused by the adsorption of Fe/Mn oxides. (C) 2019 Elsevier B.V. All rights reserved.
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