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The association of cobalt with iron and manganese (oxyhydr)oxides in marine sediment.

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The association of cobalt with iron and manganese (oxyhydr)oxides in marine sediment. / Stockdale, Anthony; Davison, William; Zhang, Hao; Hamilton-Taylor, John.

In: Aquatic Geochemistry, Vol. 16, No. 4, 09.2010, p. 575-585.

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@article{3fd4649c4ebf4796ba440fd155e93ca9,
title = "The association of cobalt with iron and manganese (oxyhydr)oxides in marine sediment.",
abstract = "Formation and dissolution of authigenic Fe and Mn (oxyhydr)oxides influence cycling of trace metals in oxic/suboxic surface sediments.We used the diffusive gradients in thin films technique (DGT) to estimate the association of cobalt with iron and manganese oxides. We compared Co, Fe and Mn maxima measured by DGT in the pore waters of fresh and aged marine sediment cores and estimated the Co/Fe and Co/Mn ratios in the metal oxides. A Mn maximum was not visible in DGT concentration profiles of freshly collected sediment cores, but after ageing the sediment we observed a distinct Mn peak, presumably due to broadening of the depth range over which the various electron acceptors occur. Estimated Co/Mn ratios from both experiments are within the range of literature values for marine sediments, but the value from the aged experiment is at the lower end of the range. This is attributed to stimulation of sulphate reduction and precipitation of cobalt sulfides. The good correlation between Co and Fe maxima in the fresh sediments is attributed to the similarity of their reactions with sulphide rather than Co being released during authigenic Fe oxide reduction.",
keywords = "DGT, porewater, trace metal, biogeochemical cycles",
author = "Anthony Stockdale and William Davison and Hao Zhang and John Hamilton-Taylor",
note = "The original publication is available at www.springerlink.com",
year = "2010",
month = sep
doi = "10.1007/s10498-010-9092-1",
language = "English",
volume = "16",
pages = "575--585",
journal = "Aquatic Geochemistry",
issn = "1380-6165",
publisher = "Springer Netherlands",
number = "4",

}

RIS

TY - JOUR

T1 - The association of cobalt with iron and manganese (oxyhydr)oxides in marine sediment.

AU - Stockdale, Anthony

AU - Davison, William

AU - Zhang, Hao

AU - Hamilton-Taylor, John

N1 - The original publication is available at www.springerlink.com

PY - 2010/9

Y1 - 2010/9

N2 - Formation and dissolution of authigenic Fe and Mn (oxyhydr)oxides influence cycling of trace metals in oxic/suboxic surface sediments.We used the diffusive gradients in thin films technique (DGT) to estimate the association of cobalt with iron and manganese oxides. We compared Co, Fe and Mn maxima measured by DGT in the pore waters of fresh and aged marine sediment cores and estimated the Co/Fe and Co/Mn ratios in the metal oxides. A Mn maximum was not visible in DGT concentration profiles of freshly collected sediment cores, but after ageing the sediment we observed a distinct Mn peak, presumably due to broadening of the depth range over which the various electron acceptors occur. Estimated Co/Mn ratios from both experiments are within the range of literature values for marine sediments, but the value from the aged experiment is at the lower end of the range. This is attributed to stimulation of sulphate reduction and precipitation of cobalt sulfides. The good correlation between Co and Fe maxima in the fresh sediments is attributed to the similarity of their reactions with sulphide rather than Co being released during authigenic Fe oxide reduction.

AB - Formation and dissolution of authigenic Fe and Mn (oxyhydr)oxides influence cycling of trace metals in oxic/suboxic surface sediments.We used the diffusive gradients in thin films technique (DGT) to estimate the association of cobalt with iron and manganese oxides. We compared Co, Fe and Mn maxima measured by DGT in the pore waters of fresh and aged marine sediment cores and estimated the Co/Fe and Co/Mn ratios in the metal oxides. A Mn maximum was not visible in DGT concentration profiles of freshly collected sediment cores, but after ageing the sediment we observed a distinct Mn peak, presumably due to broadening of the depth range over which the various electron acceptors occur. Estimated Co/Mn ratios from both experiments are within the range of literature values for marine sediments, but the value from the aged experiment is at the lower end of the range. This is attributed to stimulation of sulphate reduction and precipitation of cobalt sulfides. The good correlation between Co and Fe maxima in the fresh sediments is attributed to the similarity of their reactions with sulphide rather than Co being released during authigenic Fe oxide reduction.

KW - DGT

KW - porewater

KW - trace metal

KW - biogeochemical cycles

U2 - 10.1007/s10498-010-9092-1

DO - 10.1007/s10498-010-9092-1

M3 - Journal article

VL - 16

SP - 575

EP - 585

JO - Aquatic Geochemistry

JF - Aquatic Geochemistry

SN - 1380-6165

IS - 4

ER -