Determination of Selenium in Fifty Two Geochemical Reference Materials by Hydride Generation Atomic Absorption Spectrometry

The selenium content of fifty two geochemical reference samples, issued by several reference material producers (ANRT, GIT-IWG, USGS, NIST and GSJ) has been determined by continuous hydride generation and atomic absorption spectrometry. Selenium(VI) in the digested solutions was pre-reduced to selenium(IV) by heating in 6 mol l−1 HCl solution. The limit of detection was 3 ng g−1 selenium in common geological samples. Some samples which contain a large amount of heavy metals were analysed by the standard addition technique. The agreement between the reported results and published data is satisfactory. Les teneurs en Selenium de 52 echantillons standard de reference d'origine differente (ANRT, GIT-IWG, USGS, NIST et GSJ) ont ete determinees par generation continue d'hydrure et spectrometrie d'absorption atomique. Dans les solutions d'attaque, le Selenium VI a ete pre-reduit en Selenium IV par chauffage avec une solution HCl 6 mole−1. La limite de detection etait de 3 ng g−1 de selenium dans la majorite des echantillons geologiques. Quelques echantillons, contenant des grandes quantites de metaux lourds ont ete analyses par la technique des ajouts doses. La comparaison entre les resultats obtenus et les donnees publiees est satisfaisante.

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