Chromium provides a typical example for how the different oxidation
forms of the same element may show highly different toxicity: in
biological systems, Cr(III) is essentialwhile it is a definitely carcinogenic
element in the form of Cr(VI) [15]. Therefore, the accurate individual
determination of Cr(VI) is important. For chromium speciation, one of
the most effectively used techniques is the on-line combination of HPLC
separation with the element-selective detection of atomic spectrometry
[16–18]. Following the labour- and time-consuming, yet less accurate extraction,
ion-exchange and co-precipitation methods [19,20], in the last
two decades, several papers have been published on the combination of
Chromium provides a typical example for how the different oxidation
forms of the same element may show highly different toxicity: in
biological systems, Cr(III) is essential while it is a definitely carcinogenic
element in the form of Cr(VI) [15]. Therefore, the accurate individual
determination of Cr(VI) is important. For chromium speciation, one of
the most effectively used techniques is the on-line combination of HPLC
separation with the element-selective detection of atomic spectrometry
[16–18]. Following the labour- and time-consuming, yet less accurate extraction,
ion-exchange and co-precipitation methods [19,20], in the last
two decades, several papers have been published on the combination of