Possibilities for the simultaneous preconcentration and flame atomic absorption spectrometric determination of Cr(III) and Cr(VI) using a C18 column and sorption loop

The sorption loop as a preconcentration unit used so far in the low-pressur e flow injection (FI) system was combined with the hydraulic high-pressure nebulizer (HI-IPN) and a high-pressure liquid chromatographic (HPLC) column . Thus, the sorption preconcentration of CI(VI) can be coupled to a powerfu l sample introduction method or preconcentration techniques of Cr(III). The subsequent determination of the Cr(VI) content of the samples was carried out by flame atomic absorption (FAAS).