Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 9, Issue 1, 2007; Page No.(27-30)

DETERMINATION OF INORGANIC ARSENIC SPECIES IN NATURAL WATERS BY FLOW INJECTION HYDRIDE GENERATION ATOMIC ABSORPTION SPECTROMETRY

S. M. TALEBI AND S. HABIB-OLLAHI

Abstract

The flow injection hydride generation atomic absorption spectrometry (FI-HG-AAS) using an electrically heated quartz absorption cell was developed for the determination of arsenic (III) and arsenic (V) in natural waters. The effects of different parameters affecting the sensitivity of the method such as pH, concentration of hydrochloric acid, concentration of sodium tetrahydroborate, and atomization temperature were optimized. According to the optimization investigations, it was found that there are two possibilities for speciation of arsenic in natural waters including 1) performing speciation at two levels of pH, and 2) performing speciation at two concentration levels of NaB1-14. The latter procedure was found to be fast and easier to be use with FI-HG-AAS technique. A recovery test was performed and the results showed that the method is reliable for sensitive determination of arsenic species. The method applied to the determination of arsenic species in water resources at optimized conditions and two concentration levels of sodium tetrahydroborate.

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