Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/2705
Título: Development of a sequential injection system for the determination of nitrite and nitrate in waters with different salinity: Application to estuaries in NW Portugal
Autor: Mesquita, Raquel Beatriz Ribeiro
Ferreira, Maria Teresa Soares Oliveira Barbosa
Segundo, Ricardo Luiz Alves
Teixeira, Catarina Fernanda Carvalho Pinheiro
Bordalo, Adriano Agostinho
Rangel, António Osmaro Santos Silva
Data: 2009
Editora: The Royal Society of Chemistry
Citação: "Analytical Methods". ISSN 1759-9660.1 (2009) 195–202
Resumo: In 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.
URI: http://hdl.handle.net/10400.14/2705
Versão do Editor: http://pubs.rsc.org/en/Content/ArticleLanding/2009/AY/B9AY00101H
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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