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Development of new analytical method for preconcentration/speciation of inorganic antimony in bottled mineral water using FIA-HG AAS system and SiO2/Al2O3/SnO2 ternary oxide

2019; Elsevier BV; Volume: 294; Linguagem: Inglês

10.1016/j.foodchem.2019.05.061

1873-7072

Leandro Luan Gonçalves de Oliveira, Guilherme Orlandin Ferreira, Fabio Antônio Cajamarca Suquila, Fernanda Garcia de Almeida, Letícia Alana Bertoldo, Mariana Gava Segatelli, Emerson Schwingel Ribeiro, César Ricardo Teixeira Tarley,

Electrochemical Analysis and Applications

In the present paper, a new analytical preconcentration/speciation method for antimony species determination in bottled mineral water samples using the SiO2/Al2O3/SnO2 adsorbent was developed. The method is based on selective adsorption of Sb(III) ions by SiO2/Al2O3/SnO2 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-1 (r = 0.999), limit of detection (LD) of 0.17 µg L-1 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-1).