Phosphate Glass Electrode with Good Selectivity for Alkaline-Earth Cations

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Science  06 Dec 1963:
Vol. 142, Issue 3597, pp. 1292-1294
DOI: 10.1126/science.142.3597.1292


A phosphate glass has been found to have a significant electrode specificity toward alkaline-earth ions. The order of selectivity is 2H+ > Ba++ > Sr++ > Ca++ > 2K+ > 2Na+ > Mg++. Exchange properties are discussed in relation to possible structure. Its use to determine activity of Ca++ in natural systems containing Mg++ is sug gested.