In the present paper, a new analytical preconcentration/speciation method for antimony species determination in bottled mineral water samples using the SiO/AlO/SnO adsorbent was developed. The method is based on selective adsorption of Sb(III) ions by SiO/AlO/SnO under a wide pH range (2.5-7.5). Total antimony was determined with previous sample treatment using 0.1% (w/v) l-cysteine and the concentration of Sb(V) species was determined by the difference between total and Sb(III). The proposed method provided an analytical curve ranging from 0.50 to 5.00 μg L (r = 0.999), limit of detection (LD) of 0.17 µg L and preconcentration factor (PF) of 136-fold. The method exhibited tolerance to different metal ions and the accuracy was attested from addition and recovery tests (95.2-106.0%) in bottled mineral water samples using 2.0% (w/v) l-cysteine, as well as by analysis of certified material. Only Sb(III) species were determined in mineral water (0.54-1.04 μg L).
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| http://dx.doi.org/10.1016/j.foodchem.2019.05.061 | DOI Listing |
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