期刊
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
卷 377, 期 4, 页码 723-729出版社
SPRINGER-VERLAG BERLIN
DOI: 10.1007/s00216-003-2115-7
关键词
arsenic; fractionation; sequential extraction; synthetic mineral mixtures
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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