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The influence of pH and of added lattice and certain non-lattice ions has been studied towards the instantaneous sorption of tracer 51CrO42– species on ignited lead sulphate and barium as carrier surfaces. As expected, an increase in the carrier capacity is observed with increasing pH and lattice cation concentration. However, non-lattice cations (Ba2+ and Sr2+ ions) with a similar charge and ionic dimensions exhibit abnormal behaviour on the surface of PbSO4, and Sr2+ ions behave in a similar fashion on the surface of BaSO4. This adverse effect can be overcome by increasing the pH or lattice cation concentration in the suspension medium. An attempt has been made to explain this abnormality as arising from masking of the active adsorption centres on PbSO4 and BaSO4 surfaces under the experimental conditions employed.

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