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Potentiometric multi-syringe flow injection system for determination of exchangeable potassium in soils with in-line extraction

2006Journal article Restricted access
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dc.contributor.authorAlmeida, M. Inês G. S.
dc.contributor.authorSegundo, Marcela A.
dc.contributor.authorLima, José L. F. C.
dc.contributor.authorRangel, António O. S. S.
dc.date.accessioned2010-11-09T12:45:42Z
dc.date.available2010-11-09T12:45:42Z
dc.date.issued2006
dc.description.abstractA multi-syringe flow injection system for the potentiometric determination of exchangeable potassium in soil samples is proposed. Firstly, a manifold was devised to allow determination in soil extracts prepared off-line. It was possible to analyze samples prepared in extractants with different composition (Mehlich or Morgan) without physical or chemical modification of the manifold. A linear dynamic concentration range of 6–391 mg L−1 was obtained, allowing the direct introduction of soil extract without dilution. A determination frequency of 50 h−1 was achieved, with good repeatability for 10 consecutive injections of soil extracts (RSDb3.0%). The in-line preparation of soil extract was implemented by automatic addition of extractant solution to a previously weighed portion of soil, followed by in-line filtration. Good repeatability was attained as the variance of the extraction procedure was not significantly different from the variance obtained in consecutive measurements of the same extract. Furthermore, results comparable to those obtained by off-line extraction and determination by flame emission spectrometry were attained for the two soil samples tested. Using this procedure, a determination frequency of 13 h−1 and a sampling rate of 4 h−1 were achieved.por
dc.description.versioninfo:eu-repo/semantics/acceptedVersion
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.citationALMEIDA, M. Inês G.S...[et al.] - Potentiometric multi-syringe flow injection system for determination of exchangeable potassium in soils with in-line extraction. Microchemical Journa. ISSN 0026-265X. Vol. 83, n.º 2 (2006), p. 75-80por
dc.identifier.doi10.1016/j.microc.2006.02.004
dc.identifier.urihttp://hdl.handle.net/10400.14/3358
dc.language.isoengpor
dc.publisherElsevierpor
dc.subjectMulti-syringe flow injection analysispor
dc.subjectPotentiometrypor
dc.subjectExchangeable potassiumpor
dc.subjectSoilpor
dc.subjectIn-line extractionpor
dc.titlePotentiometric multi-syringe flow injection system for determination of exchangeable potassium in soils with in-line extractionpor
dc.typejournal article
dspace.entity.typePublication
person.familyNameGameiro de Sa Almeida
person.familyNameSegundo
person.familyNameLima
person.familyNameSantos Silva Rangel
person.givenNameMaria Ines
person.givenNameMarcela
person.givenNameJosé
person.givenNameAntónio Osmaro
person.identifierR-000-8FJ
person.identifier.ciencia-id0A14-B7A6-E805
person.identifier.ciencia-id4811-9AA9-D673
person.identifier.ciencia-idD61D-7CFB-178A
person.identifier.orcid0000-0002-5272-3468
person.identifier.orcid0000-0003-2938-0214
person.identifier.orcid0000-0002-8906-9826
person.identifier.orcid0000-0002-6486-8947
person.identifier.ridA-1009-2010
person.identifier.scopus-author-id6602384941
person.identifier.scopus-author-id10141079100
person.identifier.scopus-author-id7004827387
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublicationa0e0a8f4-578a-4359-a6d2-8626e155ac83
relation.isAuthorOfPublication84c05a53-23fa-4f4b-b007-d1a5fc748d5a
relation.isAuthorOfPublication71f20aa3-d4ae-40c3-a9ef-27d88442d1e0
relation.isAuthorOfPublication467be022-fd9c-4549-aa48-48ebcc1098eb
relation.isAuthorOfPublication.latestForDiscovery467be022-fd9c-4549-aa48-48ebcc1098eb

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