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Development of a sequential injection system for the determination of nitrite and nitrate in waters with different salinity: Application to estuaries in NW Portugal

2009Journal article Restricted access
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dc.contributor.authorMesquita, Raquel B. R.
dc.contributor.authorFerreira, Maria Teresa Soares Oliveira Barbosa
dc.contributor.authorSegundo, Ricardo Luiz Alves
dc.contributor.authorTeixeira, Catarina Fernanda Carvalho Pinheiro
dc.contributor.authorBordalo, Adriano Agostinho
dc.contributor.authorRangel, António O. S. S.
dc.date.accessioned2010-10-08T10:33:53Z
dc.date.available2010-10-08T10:33:53Z
dc.date.issued2009
dc.description.abstractIn this work, a sequential injection methodology for monitoring nitrite and nitrate in estuarine waters without any previous treatment is described. The developed system was applied to the measurement of nitrite and nitrate in estuarine waters of three rivers in the NW Portugal, allowing an automatic, fast (ca 60 h 1) and precise method (relative standard deviation lower than 2%). The procedure was based on the reaction between nitrite, sulfanilamide and N-(1-naphthyl)-ethylenediamine dihydrochloride (N1NED), whereas the determination of nitrate resulted from its reduction to nitrite, using an in-line cadmium column, followed by the same reaction. The samples were collected in three locations for each river (Douro, C avado and Ave) covering the lower, middle and upper section of the estuaries. Despite the presence of a salinity gradient, this parameter showed no interference in the accuracy of the determinations. The results obtained for the described method for nitrite were statistically comparable to those obtained by the reference procedure. For the determination of nitrate, recovery tests confirmed that the sequential injection methodology provided good quality results.por
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.citation"Analytical Methods". ISSN 1759-9660.1 (2009) 195–202por
dc.identifier.doi10.1039/B9AY00101H
dc.identifier.urihttp://hdl.handle.net/10400.14/2705
dc.language.isoengpor
dc.publisherThe Royal Society of Chemistrypor
dc.titleDevelopment of a sequential injection system for the determination of nitrite and nitrate in waters with different salinity: Application to estuaries in NW Portugalpor
dc.typejournal article
dspace.entity.typePublication
person.familyNameMesquita
person.familyNameFerreira
person.familyNameDE CARVALHO PINHEIRO TEIXEIRA
person.familyNameA. Bordalo
person.familyNameSantos Silva Rangel
person.givenNameRaquel
person.givenNameTeresa
person.givenNameCATARINA FERNANDA
person.givenNameAdriano
person.givenNameAntónio Osmaro
person.identifierJ-4630-2013
person.identifier274078
person.identifier.ciencia-idEB1D-DEE3-0B60
person.identifier.ciencia-id8F11-2CA2-1E59
person.identifier.ciencia-id8213-9759-181F
person.identifier.ciencia-id8B15-A841-2083
person.identifier.ciencia-idD61D-7CFB-178A
person.identifier.orcid0000-0001-7745-1860
person.identifier.orcid0000-0002-3900-1460
person.identifier.orcid0000-0003-3842-7133
person.identifier.orcid0000-0002-9637-6541
person.identifier.orcid0000-0002-6486-8947
person.identifier.ridJ-4630-2013
person.identifier.ridC-9785-2012
person.identifier.scopus-author-id7005556626
person.identifier.scopus-author-id7402787148
person.identifier.scopus-author-id7004738492
person.identifier.scopus-author-id7004827387
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
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