AI Article Synopsis
- Heavy metals in marine sediments can harm aquatic life and human health, and their binding forms are influenced by environmental factors like redox potential (Eh).
- The study used Tessier sequential extraction to analyze how changes in Eh affect the release of metals like Cd, Co, Ni, Pb, and Zn, finding that lower Eh leads to their release into water.
- Although manganese remained bound to FeMn oxides and Cu with stable phases, the study noted limited As pollution near industrial areas and significant heavy metals contamination in all water samples.
Article Abstract
Heavy metals (HMs) exist in various chemical forms in marine sediments, and environmental factors like the redox potential (Eh) can affect labile-bound HMs, harming aquatic life and human health. This study utilized the Tessier sequential extraction to investigate how Eh affects the binding forms of elements, including Cd, Co, Cu, Ni, Pb, Zn, Fe, and Mn. The results revealed that decreasing Eh from 120 to 50 mV resulted in the release of weakly bound forms of Cd, Co, Ni, Pb, and Zn into the water, some of which were re-adsorbed by the residual fraction as Eh decreased further to -150 mV. Manganese was consistently bound to FeMn oxides, while Cu and Fe were predominantly associated with the more stable binding phase. Based on EF, I, and CF, sediment was only polluted by As nearby an industrial zone, while water pollution indices indicated significant HMs contamination in all water samples.
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| http://dx.doi.org/10.1016/j.marpolbul.2023.115565 | DOI Listing |
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