AI Article Synopsis
- The study examined the presence of arsenic (As), iron (Fe), and manganese (Mn) in core sediments from the anoxic Danshuei Estuary using a five-step extraction process.
- Higher concentrations of As were noted in the middle and lower parts of the estuary, primarily consisting of amorphous and poorly-crystalline forms and well-crystallized oxides of Fe and Al.
- The research indicated that the sediment's geochemical behavior, particularly the concentration of dissolved As in pore water, is significantly affected by redox potential and serves as a source of dissolved As with specific diffusion rates.
Article Abstract
Sedimentary As, Fe and Mn species in core sediments from the Danshuei Estuary, an anoxic estuary, were studied using a five-sequential extraction method followed by chemical analyses of these elements. The sediment texture, redox potential and dissolved concentrations of these elements in pore water were also determined. Dissolved As diffusion flux was also calculated. Higher concentrations of sedimentary As were found at the middle and lower estuary stations. The sedimentary As species in the samples were dominated by three fractions: amorphous and poorly-crystalline; and well crystallized hydrous oxides of Fe and Al; and residual phases, accounting for 90% of the total As pool. The geochemical behavior of sedimentary As in the Danshuei Estuary is strongly influenced by the redox potential and Fe oxides. The dissolved As concentrations in pore water correlated inversely with the redox potential. The sediment served as a source of dissolved As and the diffusion flux ranged from 0.047-0.35 μg cm(-2) y(-1).
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| http://dx.doi.org/10.1016/j.marpolbul.2015.11.011 | DOI Listing |
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