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A new sodium ion image sensor containing a CCD-type semiconductor and a plasticized PVC sodium ion selective membrane was developed. The output potential slope was linear for sodium ion concentrations from 10 À1 to 10 À5 M. The optimum membrane possessed a near Nernstian response and high selectivity to sodium ions. The sensor can take sodium ion images with a fast response, 0.2 s per image, allowing it to easily monitor the ion-exchange reactions of a single Na-type cation-exchange resin bead. It was found that Na + -Ba 2 + ion-exchange was faster than Na + -Ca 2 + ion-exchange in the initial period.

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