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Issue 12, 1997
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Direct Determination of Arsenic in Sea-water by Continuous-flow Hydride Generation Atomic Fluorescence Spectrometry

Abstract

A highly sensitive and simple procedure was developed for the direct determination of total As in sea-water samples by hydride generation atomic fluorescence spectrometry. The method involves the generation of arsenic hydride from sea-water samples, diluted with HCl to a final HCl concentration of 2 mol l–1, which were merged with a reducing solution, viz., 3% m/v NaBH4. The sample and NaBH4 were pumped at flow rates of 6.0 and 1.3 ml min–1, respectively, and allowed to react in a 200 cm×0.8 mm id reaction coil. The evolved arsenic hydride was removed using an argon flow rate of 400 ml min–1 and passed to a hydrogen diffusion flame where the atomic fluorescence of As was measured at 193.7 nm. With the proposed procedure a detection limit of 5.0 ng l–1 was achieved. The repeatability of the determination varied between 1.5 and 4.0%. The accuracy was confirmed by the analysis of two sea-water reference materials (NASS-4 and CRM-403) and by recovery studies on natural samples spiked with known concentrations of AsIII and AsV. The proposed method was successfully applied to the determination of As in several sea-water samples. The number of samples that can be analysed is 40 per hour.

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Article type: Paper
DOI: 10.1039/A705264B
J. Anal. At. Spectrom., 1997,12, 1377-1380

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    Direct Determination of Arsenic in Sea-water by Continuous-flow Hydride Generation Atomic Fluorescence Spectrometry

    J. Moreda-piñeiro, M. Luisa Cervera and M. De La Guardia, J. Anal. At. Spectrom., 1997, 12, 1377
    DOI: 10.1039/A705264B

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