Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/18860
Título: Standard addition flow method for potentiometric measurements at low concentration levels: Application to the determination of fluoride in food samples
Autor: Galvis-Sánchez, Andrea C.
Santos, João Rodrigo
Rangel, António O. S. S.
Palavras-chave: Standard addition method
Fluoride ion selective electrode
Sea salt
Coffee
Water
Flow system
Data: 2015
Editora: Elsevier
Citação: GALVIS-SANCHEZ, Andrea C.; SANTOS, João Rodrigues; RANGEL, Antonio O. S. S - Standard addition flow method for potentiometric measurements at low concentration levels: Application to the determination of fluoride in food samples. Talanta. ISSN 0039-9140. N.º 133 (2015), p. 1–6
Resumo: A standard addition method was implemented by using a flow manifold able to perform automatically multiple standard additions and in-line sample treatment. This analytical strategy was based on the in-line mixing of sample and standard addition solutions, using a merging zone approach. The flow system aimed to exploit the standard addition method to quantify the target analyte particularly in cases where the analyte concentration in the matrix is below the lower limit of linear response of the detector. The feasibility of the proposed flow configuration was assessed through the potentiometric determination of fluoride in sea salts of different origins and different types of coffee in fusions. The limit of quantification of the proposed manifold was 5x 10 6 mol L -1, 10-fold lower than the lower limit of linear response of the potentiometric detector used. A determination rate of 8 samples h -1 was achieved considering an experimental procedure based on three standard additions per sample. The main advantage of the proposed strategy is the simple approach to perform multiple standard additions, which can be implemented with other ion selective electrodes, especially in cases when the primary ion is below the lower limit of linear response of the detector.
Peer review: yes
URI: http://hdl.handle.net/10400.14/18860
DOI: http://dx.doi.org/10.1016/j.talanta.2013.12.058
Aparece nas colecções:CBQF - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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