Abstract

One of the most important factors for measuring precise leach rates in continuous-flow leach tests on high-level waste glass is the dilution of leachate with freshly pumped leachant(1)(3). When analyzing results from the MCC-4 leach tests(4), the factor of dilution by leachant flow should be taken into account, since the factor determines the apparent saturation concentration after a long duration ; the higher the flow rate, the lower the apparent saturation concentration becomes(3). The dilution of leachate with freshly pumped leachant is examined here, and it is pointed out that the diffusion of elements in water should be fast enough to achieve uniform mixing in leach containers.

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