Abstract
The epicontinental seas to the east of China have become highly anthropogenically impacted due to rapid economic development in recent decades, resulting in various environmental problems, including heavy metal pollution. The Bohai Strait, as a key junction connecting the material-energy exchange between the Bohai and Yellow Seas, is extremely critical in regional pollution prevention and control. To ascertain the spatial distribution and contamination levels of heavy metals in the surface sediments of the northern Bohai Strait, a systematic investigation was conducted. Geochemical analysis revealed that the concentrations (in ppm) of heavy metal elements in surface sediments vary in the range of 4.19–77.6 for As, 0.04–0.21 for Cd, 5.1–65.7 for Pb, 0.30–39.40 for Cu, 7.77–46.50 for Ni, 1.50–86.60 for Cr, 11.70–91.80 for Zn, and 0.005–0.038 for Hg. Ecological statistics indicate that the northern Bohai Strait suffers from prominent heavy metal pollution primarily induced by As, Cd, and Pb, accompanied by relatively weak pollution of Cu and Ni. Sediments collected from the submarine depressions and the southeast region exhibit higher heavy metal concentrations, and as a consequence, more serious ecological risk. Correlation analysis indicated that the accumulations of Hg, Cr, and Zn were associated with the deposition of organic matter. Preliminary provenance discrimination suggested that the pollutants were mainly derived from the eastern parts of the North Yellow Sea, rather than the Bohai region.
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The data supporting the findings and conclusions of this study are openly available in Mendeley Data (http://dx.doi.org/10.17632/ybsfspv3xb.4).
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This work was financially supported by the Marine Geology Survey Project (grant DD20190208 and DD20190205) of China.
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Tian, ZX., Zhang, Y., Mei, X. et al. Spatial distribution and ecological risk assessment of heavy metals in surface sediments from the northern Bohai Strait, China. Environ Monit Assess 194, 802 (2022). https://doi.org/10.1007/s10661-022-10470-5
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DOI: https://doi.org/10.1007/s10661-022-10470-5