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Aveston, Everest, and Wells. 231'' Sigma " pump. Resin was kept out of the counter tube by a sintered-glass disc on the end of

Anion-exchange studies with a strongly basic exchanger show that, a t pH values close to 9, germanium, in the form of the pentagermanate ion, is strongly adsorbed from germanate solutions, even in the presence of comparable concentrations of chloride. At both lower and higher pH values the adsorption of germanium falls off rapidly and in such a manner as to indicate a decrease in the concentration of pentagermanate ions in the solutions. From solutions with higher pH values, less polymerised (probably monogermanate) ions are adsorbed in place of the pentagermanate ions. In neutral and slightly acidic solutions, too, there is evidence, although less conclusive, of adsorption of a monomeric germanate ion.The removal of adsorbed germanium from the resin on washing is interpreted as involving, as a first stage, the hydrolysis of the strongly adsorbed pentagermanate ion to the less strongly adsorbed monogermanate ion.

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