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Flow-injection potentiometric method for the routine determination of chloride: application to bread analysis

dc.contributor.authorAlmeida, Sofia A. A.
dc.contributor.authorRebelo, Tânia S. C. R.
dc.contributor.authorHeitor, Ana M.
dc.contributor.authorOliveira, M. Beatriz P. P.
dc.contributor.authorSales, M. Goreti F.
dc.date.accessioned2013-11-29T15:30:51Z
dc.date.available2013-11-29T15:30:51Z
dc.date.issued2010
dc.description.abstractBread 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.por
dc.identifier.doi10.2174/1573411011006040277pt_PT
dc.identifier.issn1573-4110
dc.identifier.urihttp://hdl.handle.net/10400.22/3041
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherBentham Science Publishers Ltd.por
dc.relation.ispartofseriesCurrent Analytical Chemistry; Vol. 6, Issue 4
dc.relation.publisherversionhttp://benthamscience.com/journal/abstracts.php?journalID=cac&articleID=72505por
dc.subjectChloridepor
dc.subjectIon selective electrodepor
dc.subjectBreadpor
dc.subjectFlow-injection analysispor
dc.subjectFoodpor
dc.titleFlow-injection potentiometric method for the routine determination of chloride: application to bread analysispor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage287por
oaire.citation.startPage277por
oaire.citation.titleCurrent Analytical Chemistrypor
oaire.citation.volumeVol. 6por
rcaap.rightsclosedAccesspor
rcaap.typearticlepor

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