FLOW-INJECTION DETERMINATION OF INORGANIC FORMS OF NITROGEN BY GAS-DIFFUSION AND CONDUCTIMETRY

dc.creatorDEFARIA, LC
dc.creatorPASQUINI, C
dc.date1991
dc.dateMAY 1
dc.date2014-12-16T11:33:55Z
dc.date2015-11-26T17:01:26Z
dc.date2014-12-16T11:33:55Z
dc.date2015-11-26T17:01:26Z
dc.date.accessioned2018-03-28T23:49:16Z
dc.date.available2018-03-28T23:49:16Z
dc.identifierAnalytica Chimica Acta. Elsevier Science Bv, v. 245, n. 2, n. 183, n. 190, 1991.
dc.identifier0003-2670
dc.identifierWOS:A1991FL09000008
dc.identifier10.1016/S0003-2670(00)80219-6
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/67300
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/67300
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/67300
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1278718
dc.descriptionA flow-injection-conductimetric method was applied to the determination of ammonia, nitrate and nitrite at concentrations down to 5, 20 and 20 ng ml-1, respectively. Ammonia was determined by merging the injected sample with an alkaline solution (NaOH-EDTA) and passing the mixture through a diffusion cell. The ammonia released was collected by a flowing stream of deionized water that passed through a conductance flow cell. Nitrate and nitrite concentrations were determined after reduction to ammonia in alkaline medium using a column filled with metallic zinc. The ammonia produced was then measured as described above. About 60 samples per hour can be processed with a relative standard deviation of about 1%. Satisfactory agreement was observed between results for ammonia in samples of natural water and nitrate in tap and mineral water determined by the proposed method and by standard spectrophotometric procedures. Speciation can be achieved by adding sulphanilic acid to remove nitrite from the sample and determining the ammonia without the use of the column.
dc.description245
dc.description2
dc.description183
dc.description190
dc.languageen
dc.publisherElsevier Science Bv
dc.publisherAmsterdam
dc.publisherHolanda
dc.relationAnalytica Chimica Acta
dc.relationAnal. Chim. Acta
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectFLOW SYSTEM
dc.subjectCONDUCTOMETRY
dc.subjectGAS DIFFUSION
dc.subjectNITROGEN
dc.subjectWATERS
dc.subjectNitrate
dc.subjectReduction
dc.subjectNitrite
dc.subjectAmmonium
dc.subjectWaters
dc.titleFLOW-INJECTION DETERMINATION OF INORGANIC FORMS OF NITROGEN BY GAS-DIFFUSION AND CONDUCTIMETRY
dc.typeArtículos de revistas


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