Über die Alterung des Chromhydroxydes, sowie über Alkalichromite und ihre Lösungen

Abstract

1. Es wurden Löslichkeitskurven von ganz reinem Chromhydroxyd (Zusammensetzung ungefähr: Cr2O3·9 H2O) in Alkalilaugen bei Zimmertemperatur aufgenommen.

Isotopic fractionation and reaction kinetics between Cr(III) and Cr(VI) in aqueous media

“…Although precipitation of Cr(OH) 3 at these moderate pH values takes place rapidly (Fricke and Windhausen, 1923;Rai et al, 1987), no visible coagulations were observed for the first 120 h. We speculate that small isotope fractionation during precipitation of Cr(OH) 3 , adsorption effects and contamination of the separated Cr(VI) with particulate Cr(III), which did not wash out from the anion exchange resin together with soluble Cr(III) during species separation, are responsible for the small change in isotopic compositions of Cr(III) and Cr(VI) complexes over extended experimental run times.…”