determinação de arsênio em águas contaminadas usando fluorescência de raios-x por energia dispersiva determination of arsenic in contaminated waters using energy dispersive x-ray fluorescence
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determinação de arsênio em águas contaminadas usando fluorescência de raios-x por energia dispersiva determination of arsenic in contaminated waters using energy dispersive x-ray fluorescence

;Luiz Carlos M. Pataca;Gisele G. Bortoleto;Maria Izabel M. S. Bueno
greece and rome 2005 Vol. 28 pp. 579-582
183
pataca2005qumicadeterminao

Abstract

This work proposes a simple, fast and inexpensive method to determine As in natural waters, using X-ray fluorescence. 50 µL of each sample containing 100 mg L-1 of yttrium as internal standard were deposited over a 2.5 µm thickness MylarTM film. The samples were dried at 50 °C for 2 h. X-ray spectra were obtained using an EDXRF apparatus. The accuracy was determined by analyte addition/recovery and by comparison with Hydride Generation Atomic Absorption Spectrometry (HG AAS). A recovery of about 100% was obtained and the results were in good agreement with HG AAS. The method showed a relative standard deviation of 6.8% and a detection limit of 10.5 µg L-1 of As.

Keywords

arsenic edxrfchemistry

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DOI:
10.1590/S0100-40422005000400004
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