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A gas diffusion sequential injection system for the determination of sulphur dioxide in wines

2001Journal article Restricted access
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dc.contributor.authorSegundo, Marcela A.
dc.contributor.authorRangel, AntĆ³nio O. S. S.
dc.date.accessioned2011-04-01T14:51:02Z
dc.date.available2011-04-01T14:51:02Z
dc.date.issued2001
dc.description.abstractIn the present work, a sequential injection system with spectrophotometric detection was developed for the determination of free and total sulphur dioxide in wines. It was based on the formation of a coloured product from the reaction among SO2, formaldehyde and pararosaniline. A gas diffusion unit (GDU) was incorporated into the manifold to prevent the wine matrix interference in the spectrophotometric measurement. An acid solution was added to the sample prior to its passage through the donor channel of the GDU to promote gaseous SO2 formation. For the free SO2 determination, the sample was directly aspirated into the holding coil; for the total SO2 determination, the sample was processed after previous in-line hydrolysis of bound SO2 with an alkali solution. Two second-order calibration curves were established, defining two concentration ranges: 2ā€“40 mg lāˆ’1 for the free SO2 determination and 25ā€“250 mg lāˆ’1 for the total SO2 determination. Relative standard deviations (n=10) were lower than 1.2% for the determination of free SO2 and lower than 2.3% for the determination of total SO2. The sample frequency was about 16 hāˆ’1. This methodology was applied to the determination of free and total sulphur dioxide in 10 table wines and the results were statistically comparable with those furnished by the recommended procedure.por
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.citationSEGUNDO, Marcela A. ; RANGEL, AntĆ³nio O.S.S. - A gas diffusion sequential injection system for the determination of sulphur dioxide in wines. Analytica Chimica Acta. ISSN 0003-2670. Vol. 427, n.Āŗ 2 (2001), p. 279ā€“286por
dc.identifier.doi10.1016/S0003-2670(00)01197-1
dc.identifier.urihttp://hdl.handle.net/10400.14/4191
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.subjectSequential injectionpor
dc.subjectSulphur dioxidepor
dc.subjectWinepor
dc.subjectGas diffusionpor
dc.subjectSpectrophotometrypor
dc.titleA gas diffusion sequential injection system for the determination of sulphur dioxide in winespor
dc.typejournal article
dspace.entity.typePublication
person.familyNameSegundo
person.familyNameSantos Silva Rangel
person.givenNameMarcela
person.givenNameAntĆ³nio Osmaro
person.identifier.ciencia-id0A14-B7A6-E805
person.identifier.ciencia-idD61D-7CFB-178A
person.identifier.orcid0000-0003-2938-0214
person.identifier.orcid0000-0002-6486-8947
person.identifier.ridA-1009-2010
person.identifier.scopus-author-id6602384941
person.identifier.scopus-author-id7004827387
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication84c05a53-23fa-4f4b-b007-d1a5fc748d5a
relation.isAuthorOfPublication467be022-fd9c-4549-aa48-48ebcc1098eb
relation.isAuthorOfPublication.latestForDiscovery467be022-fd9c-4549-aa48-48ebcc1098eb

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