Abstract
The sequential extraction methods according to Tessier et al. [1], Borovec et al. [2], Zhang and Moore [3] and Hall et al. [4] have been tested for their suitability for arsenic fractionation in samples of artificially prepared mineral mixtures. Mixtures containing different amounts of As-containing phases were prepared so that their compositions corresponded to weathering products on As-bearing ore deposits. A comparison of different procedures on simple mineral mixtures containing calcium arsenate (CaHAsO4·H2O), As-bearing goethite (FeOOH) and arsenopyrite (FeAsS) showed that only the results of the Hall method satisfactorily correspond to the expected arsenic distribution. A detailed verification of the Hall method was subsequently carried out on most complex synthetic mineral mixtures with varying amounts of As-containing kaolinite and carbonate, calcium arsenate, As-bearing goethite and arsenopyrite. The results confirm that the Hall method cannot be fully employed for an accurate As speciation but may be applied for a route identification of As distribution between "labile", "medium-labile" and "residual" forms in heavily polluted soils.
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Acknowledgements
This study was financially supported by Rio Tinto Technology, Granting Agency of the Charles University (No. 273/97/B GEO) and Ministry of Education of the Czech Republic (No. 113100005). The authors thank Dr. Madeleine Štulíková for translation of this manuscript, Marie Fayadová for assistance in analytical work and Marek Chvátal for XRD analyses. The reviews of two anonymous referees helped to improve the first version of the manuscript.
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Mihaljevič, M., Poňavič, M., Ettler, V. et al. A comparison of sequential extraction techniques for determining arsenic fractionation in synthetic mineral mixtures. Anal Bioanal Chem 377, 723–729 (2003). https://doi.org/10.1007/s00216-003-2115-7
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DOI: https://doi.org/10.1007/s00216-003-2115-7