期刊
MARINE POLLUTION BULLETIN
卷 124, 期 1, 页码 488-495出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2017.07.034
关键词
Fractions of mercury; Sediment; Spatial distribution; Risk assessment; Yangtze River estuary
资金
- National Natural Science Foundation of China [41571486]
- Ministry of Education and Social Science Fund [14YJAZH048]
- National Basic Research Program of China (973 Project) [2010CB429003]
The temporal and spatial distributions of mercury in different fractions and its potential ecological risk were investigated in sediments from the Yangtze River estuary (YRE) by analyzing data collected from, the study area. The results showed that mercury in the organic and residual fractions had dominant proportions, from 15.2% to 48,52% and from 45.96% to 81.59%, respectively. The fractions were more susceptible to seasonal changes than other fractions. Higher proportions of mercury in organic fraction were found in wet seasons; the opposite was true for mercury in residual fraction. With respect to the spatial distribution, the concentration mercury in exchangeable, carbonate and Fe-Mn oxide fractions showed a decreasing trend from the inner estuary to the outer estuary, but no obvious trends were found in the distributions of mercury in the organic and residual fractions. The risk assessment code (RAC) was used to evaluate the potential ecological risk in the study area based on the proportions of exchangeable and carbonate fractions. The average RAC values during the four periods were 6.00%, 2.20%, 2.83%, and 0.61%. Although these values show that the risk in the study area is generally low, the distribution of RAC values indicates that the inner estuary has a medium risk, with a value up to 10%.
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