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Automated system for on-line determination of dimethylarsinic and inorganic arsenic by hydride generation–atomic fluorescence spectrometry

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Abstract

A multisyringe flow-injection approach has been coupled to hydride generation–atomic fluorescence spectrometry (HG-AFS) with UV photo-oxidation for dimethylarsinic (DMA), inorganic As and total As determination, depending on the pre-treatment given to the sample (extraction or digestion). The implementation of a UV lamp allows on-line photo-oxidation of DMA and the following arsenic detection, whereas a bypass leads the flow directly to the HG-AFS system, performing inorganic arsenic determination. DMA concentration is calculated by the difference of total inorganic arsenic and measurement of the photo-oxidation step. The detection limits for DMA and inorganic arsenic were 0.09 and 0.47 μg L−1, respectively. The repeatability values accomplished were of 2.4 and 1.8 %, whereas the injection frequencies were 24 and 28 injections per hour for DMA and inorganic arsenic, respectively. This method was validated by means of a solid reference material BCR-627 (muscle of tuna) with good agreement with the certified values. Satisfactory results for DMA and inorganic arsenic determination were obtained in several water matrices. The proposed method offers several advantages, such as increasing the sampling frequency, low detection limits and decreasing reagents and sample consumption, which leads to lower waste generation.

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Acknowledgments

This work was funded by the Spain’s Ministry of Science and Innovation (Project CTQ2010-15541). L. Chaparro thanks CONACYT (National Council for Science and Technology in Mexico) for the allowance of a grant.

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Authors and Affiliations

  1. Renewable Energy and Environmental Protection Department, Advanced Materials Research Center (CIMAV), Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua, Chihuahua, 31109, Mexico

    L. L. Chaparro & L. O. Leal

  2. Department of Chemistry, University of the Balearic Islands, Cra. Valldemossa Km 7.5, 07122, Palma de Mallorca, Spain

    L. Ferrer & V. Cerdà

Authors
  1. L. L. Chaparro
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  2. L. Ferrer
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  3. V. Cerdà
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  4. L. O. Leal
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Correspondence to L. O. Leal.

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Chaparro, L.L., Ferrer, L., Cerdà, V. et al. Automated system for on-line determination of dimethylarsinic and inorganic arsenic by hydride generation–atomic fluorescence spectrometry. Anal Bioanal Chem 404, 1589–1595 (2012). https://doi.org/10.1007/s00216-012-6198-x

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  • DOI: https://doi.org/10.1007/s00216-012-6198-x

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