Comparison of Ion-Exchange Resins for the Speciation Analysis of Chromium(III) and Chromium(VI) in Alkaline Solution

Abstract

form anion-exchange columns using an original alkaline solution. Therefore, the separated Cr(III) could be determined by a direct AAS measurement of the resulting effluent.

Atomic spectrometry update. Elemental speciation

“…Methods based on ion-exchange resins include the separation of Sb III and Sb V with Dowex1X4, a strongly basic anion-exchanger; 83 the separation of Cr III and Cr VI with a combination of a cation-exchange and an iminodiacetate disc; 84 or a column filled with Dowex 1X8 anion-exchanger. 85 A strongly basic anion-exchange resin (Lewatit MonoPlus M500) and a hybrid resin containing hydrated iron oxide particles (based on Lewatit FO 36 from Lanxess) were evaluated for the separation and preconcentration of As species. 86 The hybrid resin was found unsuitable for speciation but was used, as it was designed, to retain total As.…”