Trace Level Determination of Cr(III)/Cr(VI) in Water Samples Using Ion Chromatography with UV Detection

摘要

In the present research, a method of simultaneous determination of Cr(III) and Cr(IV) with mixed bed ion-exchange column was carried out. Cr(III) is oxidized to Cr(VI) in post-column derivatization reaction, then both ions are detected by a UV detector, at wavelength A = 365 nm.The performance characteristics of the method were established by determining the following validation parameters: precision and accuracy, linearity, limit of detection, and limit of quantification. The influence of sample pH and selected inorganic ions on chromium species analyses has been checked. The method was applied for simultaneous determination of Cr(III)/Cr(VI) in environmental samples such as, rainwater and galvanic sediments.