Glass Electrodes Sensitive to Divalent Cations

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Science  23 Mar 1962:
Vol. 135, Issue 3508, pp. 1045-1048
DOI: 10.1126/science.135.3508.1045


Glass electrodes suitable for measurement of divalent cations have been made and tested. Empirical and theoretical electrode equations have been presented to describe electrode behavior in a variety of aqueous solutions. Most electrodes show response interpretable as showing nearly ideal solid-solution behavior of the cations in the glass surface. The electrodes should be useful in the measurement of divalent-cation activities in natural waters and biological fluids, and useful in general analytical chemistry.