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Heavy Metals in the Sediments of Dongshan Bay, China: Sources, Distribution, and Controlling Factors
Summary
Researchers analyzed heavy metals in sediments from Dongshan Bay, China, estimating that roughly 270 tons of heavy metals were deposited there in 2021. Evidence indicates that aquaculture, industrial discharge, and household waste are the primary sources, with lead, arsenic, zinc, and mercury showing the most enrichment in the bay's sediments.
Fifty-one surface sediment samples from Dongshan Bay, China, were analyzed for heavy metals to evaluate their distribution, pollution status, and controlling factors. The enrichment factor is suggestive of the potential pollution status, ranging from minimal to moderate enrichment, for Pb, As, Zn, and Hg, with one site showing significant enrichment in As. A principal component analysis and the geochemical characteristics indicate that heavy metal concentrations are mainly influenced by clay minerals and Fe oxides, while Pb and Hg levels are also closely linked to the absorption of Mn oxides. Potential pollution is primarily from aquaculture (Cd, Zn, Cu, Pb) and industrial and domestic discharges. Approximately 270 tons of heavy metals were estimated to have been deposited in Dongshan Bay in 2021, highlighting the potential impact of human activities on coastal sediment quality.
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