Die physikalisch-chemische Analyse des Zirkonoxychlorids und des Zirkonoxydsols

The Aqueous Chemistry of Zirconium

“…Thus each f is the fraction of the total activity contributed by species containing the indicated number of chelate groups. It s~ould be ~ointed out that in performing the differentiation leading to equation (11), it w~s necessary that the activity of water and of hydrogen ion remain constant.…”

“…An equation having exactly the same form as equation (11) may be derived on the basis .of concentrations rather than activities. I!l this case the equilibrium quotients and the extraction coefficient are expressed in terms of concentrations.…”

“…I!l this case the equilibrium quotients and the extraction coefficient are expressed in terms of concentrations. EC].uations (10) a.nd (11) then become:…”

“…Most of this zirconium was recovered by wnshing out the flask with 1M H2 so 4 , so it appeared th~t r'.t these low acidities, zirconium was hydrolyzin~ onto the glass surface of the extraction vessels. In an effort to minimize the loss due to this effect, the experiments at the lower acidities were repeeted using extro.ction vessels which had been coated with11 the presence of the thin film of wn ter which is nlwnys present on a ,glass surface which hns been cdr dried without br.kinf!. The hydrocarbon surface which is formed• is not wet by water, so there should be little tendency for the zirconium to hydrolyze onto this surface.…”