Anal. methods and techniques used in the speciation anal. The system based on high-performance liq. chromatog. hyphenated with the hydride generation at absorption spectrometry was successfully used to detn. of As(III), As(V), Se(IV), Se(VI), Sb(III) and Sb(IV) in environmental samples. The batch system of in-situ extraction and hydride generation at. absorption spectrometry was used for detn. of metalloids.