Journal
MARINE POLLUTION BULLETIN
Volume 98, Issue 1-2, Pages 115-129Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2015.07.006
Keywords
Heavy metal; BCR sequential extraction; SEM/EDS; Yangtze River estuary; North Jiangsu tidal flat
Funding
- National Natural Science Foundation of China [41303006]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Ministry of Science and Technology of China
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This research focuses on the spatial and temporal patterns of heavy metals from the Yangtze River estuary and the tidal flat of north Jiangsu. Most heavy metals in the surficial sediments after normalization to Ti decreased seaward at the Yangtze River estuary. The core records showed that the heavy metal variations in the last 50 years were primarily linked to natural weathering input of trace elements. However, significant heavy metal pollution (mainly Ni, Pb, Cd, Cu and As) were in the two study areas, with anthropogenic inventories accounting for 23-40% percent of the total pollution. Sequential extraction showed that Pb, Cu and Ni were present largely in the non-residual fraction, which indicated the potential bioavailability in the study areas. The SEM/EDS together with sequential extraction facilitated the easy tracing of the origin/sources of heavy metals in a simple way in the estuary and the tidal flat. (C) 2015 Elsevier Ltd. All rights reserved.
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