Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/3041
Título: Flow-injection potentiometric method for the routine determination of chloride: application to bread analysis
Autor: Almeida, Sofia A. A.
Rebelo, Tânia S. C. R.
Heitor, Ana M.
Oliveira, M. Beatriz P. P.
Sales, M. Goreti F.
Palavras-chave: Chloride
Ion selective electrode
Flow-injection analysis
Data: 2010
Editora: Bentham Science Publishers Ltd.
Relatório da Série N.º: Current Analytical Chemistry; Vol. 6, Issue 4
Resumo: Bread is consumed worldwide by man, thus contributing to the regular ingestion of certain inorganic species such as chloride. It controls the blood pressure if associated to a sodium intake and may increase the incidence of stomach ulcer. Its routine control should thus be established by means of quick and low cost procedures. This work reports a double- channel flow injection analysis (FIA) system with a new chloride sensor for the analysis of bread. All solutions are prepared in water and necessary ionic strength adjustments are made on-line. The body of the indicating electrode is made from a silver needle of 0.8 mm i.d. with an external layer of silver chloride. These devices were constructed with different lengths. Electrodes of 1.0 to 3.0 cm presented better analytical performance. The calibration curves under optimum conditions displayed Nernstian behaviour, with average slopes of 56 mV decade-1, with sampling rates of 60 samples h-1. The method was applied to analyze several kinds of bread, namely pão de trigo, pão integral, pão de centeio, pão de mistura, broa de milho, pão sem sal, pão meio sal, pão-de-leite, and pão de água. The accuracy and precision of the potentiometric method were ascertained by comparison to a spectrophotometric method of continuous segmented flow. These methods were validated against ion-chromatography procedures.
Peer review: yes
URI: http://hdl.handle.net/10400.22/3041
ISSN: 1573-4110
Versão do Editor: http://benthamscience.com/journal/abstracts.php?journalID=cac&articleID=72505
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