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- W2034969976 abstract "Experimental etch/leach of Carboniferous Limestone gravels on a laboratory time-scale has demonstrated that 234U238U activity ratios (AR's) greater than the radiochemical equilibrium value may be generated on short time-scales. The molar U/Ca and Mg/Ca ratios show that both U and Mg are leached preferentially relative to Ca whereas the molar U/Mg ratio is only slightly greater than that of the rock matrix. The generation of enhanced AR's is attributed to a two-stage process in which the limestone surface is dissolved by zero-order etch and silicate minerals so released are subjected to first-order chemical leach of U and Mg. The implications of these results for the production of enhanced AR's in Carboniferous Limestone groundwater are discussed. It is suggested that chemical leaching or exchange of U between groundwater and its particulate load or at the aquifer fluid-solid interface is an important mechanism controlling AR changes as groundwater migrates beyond a redox boundary. AR's for dissolved U in groundwater are more probably related to chemical equilibria than to groundwater age." @default.
- W2034969976 created "2016-06-24" @default.
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- W2034969976 date "1993-01-01" @default.
- W2034969976 modified "2023-10-02" @default.
- W2034969976 title "The mechanism of 234U238U activity ratio enhancement in karstic limestone groundwater" @default.
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- W2034969976 doi "https://doi.org/10.1016/0009-2541(93)90301-x" @default.
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