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A sequential injection system for the spectrophotometric determination of calcium, magnesium and alkalinity in water samples

2004Journal article Restricted access
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dc.contributor.authorMesquita, Raquel B. R.
dc.contributor.authorO. S. S. Rangel, António
dc.date.accessioned2011-10-22T09:27:28Z
dc.date.available2011-10-22T09:27:28Z
dc.date.issued2004
dc.description.abstractA sequential injection methodology for the spectrophotometric determination of calcium, magnesium and alkalinity in water samples is proposed. A single manifold is used for the determination of the three analytes, and the same protocol sequence allows the sequential determination of calcium and magnesium (the sum corresponds to the water hardness). The determination of both metals is based on their reaction with cresolphtalein complexone; mutual interference is minimized by using 8-hydroxyquinoline for the determination of calcium and ethylene glycol-bis(0-aminoethyl ether)- N,N,N',N'-tetraacetic acid (EGTA) for the determination of magnesium. Alkalinity determination is based on a reaction with acetic acid, and corresponding color change of Bromcresol Green. Working ranges of 0.5 - 5 mg dm” for Ca, 0.5 - 10 mg dm” for Mg, and 10 - 100 mg HCO3’ dm’3, for alkalinity have been achieved. The results for water samples were comparable to those of the reference methods and to a certified reference water sample. RSDs lower than 5% were obtained, a low reagent consumption and a reduced volume of effluent have been accomplished. The determination rate for calcium and magnesium is 80 h’1, corresponding to 40 h’1 per element, while 65 determinations of alkalinity per hour could be carried out.por
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.citation"Analytical Sciences" . ISSN 0910-6340. 20: 8 (2004) 1205-1210por
dc.identifier.doi10.2116/analsci.20.1205
dc.identifier.urihttp://hdl.handle.net/10400.14/6769
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherThe Japan Society for Analytical Chemistrypor
dc.titleA sequential injection system for the spectrophotometric determination of calcium, magnesium and alkalinity in water samplespor
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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