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Arsenic speciation by hydride generation-Quartz furnace atomic absorption spectrometry. Optimization of analytical parameters and application to environmental samples

Nathalie Molenat, A. Astruc, M. Holeman, Georges Maury, R. Pinel

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Abstract

Analytical parameters of hydride generation, trapping, gas chromatography and atomic absorption spectrometry detection in a quartz cell furnace (HG/GC/QFAAS) device have been optimized in order to develop an efficient and sensitive method for arsenic compounds speciation.Good performances were obtained with absolute detection limits in the range of 0.1 -0.5 ng for arsenite, arsenate, monomethylarsonic acid (MMAA), dimethylarsinic acid (DMAA) and trimethylarsine oxide (TMAO).A pH selective reduction for inorganic arsenic speciation was successfully reported.Application to the accurate determination of arsenic compounds in different environmental samples was performed.

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Analytical parameters of hydride generation, trapping, gas chromatography and atomic absorption spectrometry detection in a quartz cell furnace (HG/GC/QFAAS) device have been optimized in order to develop an efficient and sensitive method for arsenic compounds speciation.Good performances were obtained with absolute detection limits in the range of 0.1 -0.5 ng for arsenite, arsenate, monomethylarsonic acid (MMAA), dimethylarsinic acid (DMAA) and trimethylarsine oxide (TMAO).A pH selective reduction for inorganic arsenic speciation was successfully reported.Application to the accurate determination of arsenic compounds in different environmental samples was performed.

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Available abstract

Analytical parameters of hydride generation, trapping, gas chromatography and atomic absorption spectrometry detection in a quartz cell furnace (HG/GC/QFAAS) device have been optimized in order to develop an efficient and sensitive method for arsenic compounds speciation.Good performances were obtained with absolute detection limits in the range of 0.1 -0.5 ng for arsenite, arsenate, monomethylarsonic acid (MMAA), dimethylarsinic acid (DMAA) and trimethylarsine oxide (TMAO).A pH selective reduction for inorganic arsenic speciation was successfully reported.Application to the accurate determination of arsenic compounds in different environmental samples was performed.

Key concepts: Arsenite, Arsenate, Arsenic, Chemistry, Atomic absorption spectroscopy, Hydride, Detection limit, Genetic algorithm

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