Written in English
|Statement||by Robert James Davies-Colley.|
|The Physical Object|
|Pagination||, 224 leaves, bound :|
|Number of Pages||224|
Estuarine sediment controls on trace metal distributions. By. Abstract. The work upon which this publication is based was supported in part by funds provided by the Office of Water Research and Technology (Project No. AORE), U.S. Department of the Interior, Washington, D.C., as authorized by the Water Research and Development Act of Estuarine sediment controls on trace metal distributions. By. Abstract. (EHS) extracted from a natural sediment were chosen to simulate components responsible for trace metal binding in oxidized sediments. The uptake of copper and cadmium by these model phases in artificial seawater was measured as a function of pH and salinity. Typically, trace metals correlate well with Al, and with Fe and Mn oxyhydroxides. The results of this study show that in the western Moreton Bay region, natural controls have the major influence over metal distribution; although urban and industrial inputs exist, for much of the area they are by: Natural trace metal concentrations in estuarine sediments are found at different concentrations depending on the geology of the area (Windom et al., ). However, estuarine sediments also receive significant anthropogenic loads of metals from both point and non-point sources increasing their natural background concentrations.
The effects of the short-term resuspension of a contaminated anoxic estuarine sediment on solid-phase metal speciation have been studied. Preliminary experiments investigated the oxidation rates of model metal sulfide phases to provide mechanistic information for interpreting the observations on the natural sediment. FeS and MnS model phases were particularly labile and oxidized rapidly in. Grain size of sediment is one of the major controlling factors for the distribution of trace metals in coastal area. In general, coarse particles consist mainly of geological minerals, such as quartz and feldspars. The possible formation of trace metal sulphides and reaction of trace metals with Fe sulphide minerals has been thoroughly documented. During the sulphidisation process some trace metals, that are liberated from sedimentary components such as organic matter and metal oxides, can adsorb onto or co-precipitate with FeS minerals or can precipitate. Abstract Suspended sediment, sediment‐associated, total trace element, phosphorus (P), and total organic carbon (TOC) fluxes were determined for the Mississippi, Columbia, Rio Grande, and Colorado.
Biogeochemical control on the flux of trace elements from estuarine sediments: effects of seasonal and short-term hypoxia. Marine Environmental Research , 47 (4), DOI: /S(98) An examination of partition data for trace metals (Cd, Cr, Cu, Hg, Ni, Pb, Zn) from a number of independent studies conducted in a highly contaminated, organic-rich estuary (Mersey, UK) indicates an increase in the sediment−water distribution coefficient, KD, with increasing salinity for all metals with the exception of Cd. This behavior is not consistent with inorganic speciation. Many small estuaries are influenced by flow restrictions resulting from transportation rights-of-way and other causes. The biogeochemical functioning and history of such systems can be evaluated through study of their sediments. Ten long and six short cores were collected from the length of Jordan Cove, Connecticut, a Long Island Sound subestuary, and analyzed for stratigraphy, radionuclides. Grain size distribution in sediment significantly influences trace/heavy metal concentrations and their bioavailability in sediments. Some studies have shown that highest concentrations of metals are associated with fine grained sediment particles (Chakraborty et al., a, Chakraborty et al., b).