Molybdenum in pore waters of anoxic marine sediments by electron paramagnetic resonance spectroscopy |
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| Authors: | Rudolfo Contreras Thomas R Fogg N Dennis Chasteen |
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| Institution: | Department of Chemistry, University of New Hampshire, Durham, N.H. 03824 U.S.A.;Department of Earth Sciences, University of New Hampshire, Durham, N.H. 03824 U.S.A. |
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| Abstract: | Pore water samples of anoxic sediments from Great Bay, N.H. and Jeffrey's Basin, New England continental shelf, have been analyzed for dissolved molybdenum by the electron paramagnetic resonance (EPR) spectroscopy technique of Hanson et al. (1977). The method has been modified so that only 0.50 ml of pore water sample is utilized for the analysis. The concentrations of Mo in the Jeffrey's Basin pore fluids are as much as an order of magnitude higher than that of the overlying water, while the estuarine water concentrations are only twice that of the overlying water.The Mo in the pore water is negatively correlated to dissolved Fe2+ and positively correlated to the precent of organic carbon in the sediments. This suggests that Mo is remobilized by the anaerobic degradation of sedimentary organic matter and is not directly incorporated into iron pyrite during early diagenesis. |
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