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Determination of Trace Arsenic in the Vegetables by Hydride Generation-Atomic Fluorescence Spectrometry

Sun Han

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Abstract

The effects of concentration of NaBH4 and HCl, flow rate of the carrier gas and the shield gas, the atomizer temperature and the observation height were studied in the determination of arsenic by hydride generation-atomic fluorescence spectrometry (HGAFS). The interference from foreign ions on arsenic was eliminated by adding ascorbic acid-thiourea-citric acid and the relevant mechanism wasbriefly discussed. The present method was applied to the determination of arsenic in vegetable samples with a recovery of 97.5%～104.5% and a RSD of 0.79%～1.43%. The detection limit(3σ) of arsenic is 1.26 ng/g for 5 g of sample.

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What this paper is about

The effects of concentration of NaBH4 and HCl, flow rate of the carrier gas and the shield gas, the atomizer temperature and the observation height were studied in the determination of arsenic by hydride generation-atomic fluorescence spectrometry (HGAFS). The interference from foreign ions on arsenic was eliminated by adding ascorbic acid-thiourea-citric acid and the relevant mechanism wasbriefly discussed. The present method was applied to the determination of arsenic in vegetable samples with a recovery of 97.5%～104.5% and a RSD of 0.79%～1.43%. The detection limit(3σ) of arsenic is 1.26 ng/g for 5 g of sample.

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Available abstract

The effects of concentration of NaBH4 and HCl, flow rate of the carrier gas and the shield gas, the atomizer temperature and the observation height were studied in the determination of arsenic by hydride generation-atomic fluorescence spectrometry (HGAFS). The interference from foreign ions on arsenic was eliminated by adding ascorbic acid-thiourea-citric acid and the relevant mechanism wasbriefly discussed. The present method was applied to the determination of arsenic in vegetable samples with a recovery of 97.5%～104.5% and a RSD of 0.79%～1.43%. The detection limit(3σ) of arsenic is 1.26 ng/g for 5 g of sample.

Key concepts: Arsenic, Hydride, Chemistry, Detection limit, Thiourea, Ascorbic acid, Mass spectrometry, Fluorescence spectrometry

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