期刊
CHEMOSPHERE
卷 147, 期 -, 页码 173-179出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2015.12.100
关键词
Mercury; Mercury isotopes; Fish; Bio-accumulation; Pearl River Estuary
资金
- Seed Collaborative Research Fund (SCRF) grant from the State Key Laboratory of Marine Pollution
- China Basic Research Program (973 Project) [2013CB430000]
- Natural Science Foundation of China [41303014]
- General Research Fund of the Hong Kong Research Grants Council [663112]
Coastal and estuarine regions are important areas of mercury pollution. Therefore, it is important to properly characterize the sources and bioaccumulation processes of mercury in these regions. Here, we present mercury stable isotopic compositions in 18 species of wild marine fish collected from the Pearl River Estuary (PRE), south China. Our results showed variations in mass-independent fractionation (Delta Hg-199: +0.05 +/- 0.10 parts per thousand to +0.59 +/- 0.30 parts per thousand) with a Delta Hg-199/Delta Hg-201 of similar to 1.26, suggesting that aqueous MeHg underwent photo-degradation prior to incorporation into the food chain. For the results, we discovered small but significant differences of Delta Hg-199 values among herbivorous, demersal, and carnivorous fish, indicating that different feeding guilds of fish may have incorporated MeHg with various degrees of photo-demethylation. The consistent mercury isotope compositions between fish feeding habitat and mercury sources in the estuary provide potentially important findings on the transformation and bioaccumulation of this toxic metal in subtropical coastal environments. (C) 2015 Elsevier Ltd. All rights reserved.
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