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Full-Text Articles in Physical Sciences and Mathematics
The Biogeochemistry Of Iodine In Seawater, Lingsu Zhang
The Biogeochemistry Of Iodine In Seawater, Lingsu Zhang
OES Theses and Dissertations
Iodate and iodide are the two major species of iodine in seawater. In comparison to iodate, iodide is thermodynamically unstable in oxic seawater. The conversion (or reduction) of iodate to iodide may be mediated via biological activities. Since biological activities vary with the season, the conversion of iodate to iodide may also vary seasonally. The conversion (or oxidation) of iodide to iodate is thermodynamically feasible, but the mechanism is poorly known. Hydrogen peroxide, which is ubiquitous in surface seawater, may oxidize iodide to iodate.
Water samples were collected in the middle and lower Chesapeake Bay in different seasons between 1990 …
The Biogeochemistry Of Hydrogen Sulfide In The Open Ocean, Joël Radford-Knoery
The Biogeochemistry Of Hydrogen Sulfide In The Open Ocean, Joël Radford-Knoery
OES Theses and Dissertations
Hydrogen sulfide is a poorly quantified component of the global sulfur cycle. In seawater, its dissolved species (dissolved sulfide) can react with trace metals to form dissolved complexes and insoluble compounds. Therefore, the study of dissolved° sulfide in the open ocean can yield a better understanding of the biogeochemical cycles of sulfur and trace metals.
The biogeochemical cycling of dissolved sulfide was examined using specially developed sampling and analytical methods. In the western North Atlantic and central Equatorial Pacific Oceans, total dissolved sulfide concentrations ranged from /L; they were highest, in the mixed layer and decreased with depth. The depth …