Add time:10/01/2019         Source:sciencedirect.com

Our research group have been contributing to the development of speciation analytical techniques with the elaboration of various chromium speciation methods since 1990. In the past period 20 divers techniques have been developed for the separation, enrichment and determination of toxic chromium (VI) and essential chromium (III) forms in environmental samples. The aim of present work is to compare the analytical performance of introduced chromium speciation techniques, and to get an overall picture about the limit of detection and range of quantification of the on-line and off-line techniques, and to present the optimal experimental arrangements to achieve the best possible analytical performances using the latest analytical tools. The analytical performance of on-line chromium speciation techniques can be improved by the appropriate enrichment of chromium forms, by using interface connecting the separation/enrichment unit and the element selective detector with the highest sample introduction efficiency, and by using a detector with the best possible sensitivity. The lowest limit of detection (3σ) for Cr (VI) (20 pg/mL) could be achieved by using C-18 chromatographic separation/enrichment column, hydraulic high pressure nebulizer (HHPN) and acetylene – nitrous oxide flame emission detection unit. The10 pg/mL (3σ) limit of detection of off-line chromium speciation method was reached by 50-fold enrichment using liquid-liquid extraction (LLE) and graphite furnace atomic absorption spectrometry (GFAAS). These techniques are suitable for the chromium speciation analysis of natural samples with various matrices.

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