The sorption edge for 90Sr was observed between pH 4 – 6 with maximum sorption occurring (Kd ~ 103 L kg-1) at pH 6 - 8. In experiments with low ionic strength groundwaters (< 0.01 mol L-1), pH variation is the main control on sorption. Here, batch sorption experiments were used to examine the sorption behaviour of 90Sr in sediment-water systems representative of the UK Sellafield nuclear site based on groundwater and contaminant fluid compositions. The extent of sorption is controlled by the geochemistry of the groundwater and sediment mineralogy. Transport of 90Sr in groundwaters is primarily controlled by sorption reactions with aquifer sediments. Strontium-90 is a beta emitting radionuclide produced during nuclear fission, and is a problem contaminant at many nuclear facilities.
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