A hydride generation flow system for determination of arsenic and selenium by total reflection X-ray fluorescence spectrometry

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• 作者：Gomes ; Ana Carla F. ; Meneg&aacute ; rio ; Amauri A. ; Pellegrinotti ; Daniel C. ; Giné ; Maria F. ; et. al.
• 关键词：TXRF ; Hydride generation ; Flow system ; Preconcentration
• 刊名：Spectrochimica Acta Part B: Atomic Spectroscopy
• 出版年：2004
• 出版时间：September 20, 2004
• 年：2004
• 卷：59
• 期：9
• 页码：1481-1484
• 全文大小：128 K

文摘

In this work, a preconcentration and separation system based on continuous flow hydride generation is proposed to improve the determination of As and Se by total reflection X-ray fluorescence spectrometry. The generated hydrides are continuously separated from the liquid phase and collected in a chamber containing 250 μl of HCl/HNO₃ 1:1 (v/v) solution. Hydride generation conditions and collection of the hydrides were evaluated. Under optimised conditions, enrichment factors of 55 for As and 82 for Se were attained. Detection limits of 0.3 μg l⁻¹ for As and Se were obtained when 20 ml of sample was used. Analysis of a natural water standard reference material from National Institute of Standard and Technology (SRM-1640) was in agreement with the certified values at the 95 % confidence level.