Monodispersed Chromium(Ⅲ) Hydroxide Particles - Exchangeability of Sulphate Ions

摘要

Kinetics of ligand exchange between sulphate ions (present in the core of monodispersed chromium hydroxide particles in the form of chromium basic sulphate) and hydroxyl ions has been studied. In addition, the effect of pH on the extent of this exchange has been investigated. Preliminary results showed that the rate of exchange is relatively high and substantially exceeds the rate for water ex- change described in the literature for soluble [Cr(H_2O)_6]~3+ species. This observation contradicts the suggestion by some authors~1 that the rate of SO~2-_4/OH~- ligand exchange at the solid/liquid interface is very slow.