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The sorption behavior of Ba 2+ and Co 2+ ions on a natural clay sample rich in kaolinite was studied using time-of-flight secondary ion mass spectrometry (ToF–SIMS). Depth profiling at 10-Å steps was performed up to a 70-Å matrix depth of the clay prior to and following sorption. The results showed that Co 2+ is sorbed in slightly larger quantities than Ba 2+ , with...
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