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KMID : 1024519930020010043
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Journal of the Environmental Sciences
1993 Volume.2 No. 1 p.43 ~ p.49
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Sulfate reduction and sulfur isotopic fractionation in marine sediments
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Han Myung-Woo
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Abstract
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Concentrations of sulfate and 6-values of sulfate, , dissolved In pore waters were measured from the sediment cores of the two different marine environments : deep northeast Pacific (57-1) and coastal Kyunggi Bay of Yellow Sea (57-2) . Sulfate concentration in pore waters decreases with depth at both cores, reflecting sulfate reduction in the sediment columns. However, much higher gradient of pore water sulfate at 57-2 than 57-1 indicates more rapid sulfate reduction at 57-2, because of high sedimentation rate at the coastal area compared to the deep-sea. The measured 6-values, , follow extremely well the predicted trend of the Rayleigh fractionation equation. The range of 26.756 to 61.35% at the coastal core 57-2 is not so great as that of 32.4 to 97.8 at the deep-sea core 57-1. Despite greater graclient of pore water sulfate at 57-2, the 6-values become lower than those of the deep- sea core 57-1. This inverse relation between the 6-values and the gradients of pore water sulfate could be explained by the combination of the two subsequent factors : the kinetic effect by which the residual pore water sulfate becomes progressively enriched with respect to the heavy isotope of as sulfate reduction proceeds, and the intrinsic formulation effect of the Rayleigh fractionation equation in which the greater becomes the fractionation factor, the more diminished values of are predicted. Key words : sulfate reduction, 6-value of pore water sulfate, isotopic fractionation
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KEYWORD
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sulfate reduction, 8-value iof pore water sulfate, isotopic fractionation
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