Abstract
Porous glass (1 g, 97 m 2) composed of 96% silica adsorbed 3.2–3.7 μmol of cations, such as Na, K, Sr, Ca and Mg ions, in a distilled water medium. Cations adsorbed were exchanged with other ions by equilibrium reaction and adsorption of bivalent cations on the glass was stronger than those of monovalent cations. The minimum detection limit to be able to estimate the value of cations is nM when usual glassware is used for determination of cations.
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