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A flow system for the spectrophotometric determination of lead in different types of waters using ion-exchange for pre-concentration and elimination of interferences

2004Journal article Restricted access
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dc.contributor.authorMesquita, Raquel B. R.
dc.contributor.authorFernandes, Sílvia M.V.
dc.contributor.authorRangel, António O.S.S.
dc.date.accessioned2010-11-17T11:31:04Z
dc.date.available2010-11-17T11:31:04Z
dc.date.issued2004
dc.description.abstractA flow system for the spectrophotometric determination of lead in natural and waste waters is proposed. The determination is based on the colorimetric reaction between malachite green and iodide, followed by the formation of a ternary complex between those reagents and lead cations. The developed flow system includes a lead pre-concentration step in a column packed with a cationic resin (Chelex 100) operating in a sequential injection mode. To improve the mixture of sample and reagents, a flow injection approach was adopted for the colorimetric determination. This way a hybrid flow system, involving both sequential and flow injection concepts was designed. Another feature of the proposed system is the efficient elimination of major interferent species, such as cadmium and copper. The elimination of cadmium interference is obtained by complexing Cd2+ with chloride and retaining the formed negatively charged complexes in an anionic resin, AG1 X-8. As for copper, with the presence of both ionic resins as well as the conditions for cadmium elimination, it no longer acts as an interferent. Different ranges of lead concentration (50–300 and 300–1000 g l−1) can be determined with minor changes in the controlling software, useful for application to both natural and waste waters. Therefore, a detection limit of 25 g l−1 was achieved. Repeatability was evaluated from 10 consecutive determinations being the results better than 4%. The recoveries of lead spikes added to the samples ranged from 93 to 102%. The sampling frequency was 17 and 24 determinations per hour, for 50–300 and 300–1000 g l−1 ranges, respectively.por
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.citationMESQUITA, Raquel B. R. ; FERNANDES, Sílvia M. V. ; RANGEL, António O.S.S. - A flow system for the spectrophotometric determination of lead in different types of waters using ion-exchange for pre-concentration and elimination of interferences. Talanta. ISSN 0039-9140. Vol. 62, n.º 2 (2004), p. 395-401por
dc.identifier.doi10.1016/j.talanta.2003.08.009
dc.identifier.urihttp://hdl.handle.net/10400.14/3472
dc.language.isoengpor
dc.publisherElsevierpor
dc.subjectFlow systempor
dc.subjectLead determinationpor
dc.subjectIon-exchangepor
dc.subjectSpectrophotometrypor
dc.subjectWaterspor
dc.titleA flow system for the spectrophotometric determination of lead in different types of waters using ion-exchange for pre-concentration and elimination of interferencespor
dc.typejournal article
dspace.entity.typePublication
person.familyNameMesquita
person.familyNameSantos Silva Rangel
person.givenNameRaquel
person.givenNameAntónio Osmaro
person.identifierJ-4630-2013
person.identifier.ciencia-idEB1D-DEE3-0B60
person.identifier.ciencia-idD61D-7CFB-178A
person.identifier.orcid0000-0001-7745-1860
person.identifier.orcid0000-0002-6486-8947
person.identifier.ridJ-4630-2013
person.identifier.scopus-author-id7005556626
person.identifier.scopus-author-id7004827387
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublicationf89887f1-4d1b-438b-8f03-27d9bda1de7b
relation.isAuthorOfPublication467be022-fd9c-4549-aa48-48ebcc1098eb
relation.isAuthorOfPublication.latestForDiscovery467be022-fd9c-4549-aa48-48ebcc1098eb

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