Journal
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
Volume 152, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.trac.2022.116617
Keywords
Selenium; Speciation; CVG-AFS; Microwave radiation; UV radiation
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Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior [001]
- Fundacao de Amparoa Pesquisa do Estado da Bahia (FAPESB)
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This study discusses the methods for selenium speciation analysis using CVG-AFS and their advantages and drawbacks.
The inorganic selenium speciation analysis by non-chromatographic methods using atomic fluorescence spectrometry with chemical vapor generation (CVG-AFS) involves the determination of total selenium and Se(IV). Quantification of Se(VI) concentration is obtained by the difference between the total selenium and Se(IV) concentrations. However, the determination of total selenium requires a pre-reduction step of Se(VI) to Se(IV), which is complicated because the kinetics of this reaction is very slow, although thermodynamically favorable. Even chromatographic speciation methods established with detection using CVG-AFS require a pre-reduction step from Se(VI) to Se(IV) because the chemical vapor generation occurs with the Se(IV) species converted to H2Se. This way, several strategies have been proposed for the selenium speciation involving microwave radiation, UV radiation, conventional heating, and different reagents (potassium iodide, sodium bromide, hydrochloric acid, nitric acid, potassium bromate, organic acids), besides co-precipitation and solid-phase extraction procedures. This work reports the advantages and drawbacks of the main techniques employed in selenium speciation studies. (C)& nbsp;2022 Elsevier B.V. All rights reserved.
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