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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 suggested.
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Phosphate glass electrode with good selectivity for alkaline-earth cations