Data/hora: 02/06/2024 16:42:12

Biblioteca(s): 	Embrapa Pecuária Sudeste.	
Tipo da produção científica: 	Artigo em Periódico Indexado	
Data corrente: 	23/01/2006	
Data da última atualização: 	13/03/2023	
Autoria: 	LIN, P. K. T; NOGUEIRA, A. R. de A.; MONTENEGRO, M. C. B. S.; PÉREZ-OLMOS, R.	
Afiliação: 	P. KONG THOO LIN, The Robert Gordon University; ANA RITA DE ARAUJO NOGUEIRA, CPPSE; M. C. B. S. M. MONTENEGRO, Universidade do Porto; R. PÉREZ-OLMOS, Universidad del País Vasco.	
Título: 	New PVC nitrate-selective electrode: application to vegetles and mineral waters.	
Ano de publicação: 	2005	
Fonte/Imprenta: 	Journal of Agricultural and Food Chemistry, v. 53, n. 2, p. 211-215, 2005.	
DOI: 	10.1021/jf049227u	
Idioma: 	Inglês	
Conteúdo: 	The paper refers the analytical potentialities of the oxa-azamacrocycles as potentiometric ionophores for the construction of electrodes selective to nitrate. Afterward, the membrane selective to nitrate is designed and optimized using a [3.3.3.3]oxazane as an ionophore. The membrane was prepared using dibutylphthalate as a solvent mediator, tetraoctylammonium as a lipophilic membrane additive, and poly(vinyl chloride (PVC) as a polymeric matrix, applied directly onto a conductive graphite/epoxy resin support. The electrodes presented a slope of 60 ± 0.1 mV log-1, a low limit of linear response of 4.2 × 10-6 mol L-1, a useful lifetime of 1 year, and improved selectivity characteristics when compared with other nitrate electrodes. The good working characteristics of this electrode, constructed without inner-reference solution, made possible its application to the determination of nitrate in different types of vegetables and bottled mineral waters without the use of a conditioning solution. The application of a significant F test proved that the results obtained were similar to those attained by application of the brucine spectrophotometric method adopted as a reference technique. Linear regression analysis also showed good agreement between the results obtained by the proposed method and the reference one.	
Palavras-Chave: 	New PVC; Nitrate selective electrode.	
Categoria do assunto: 	W Química e Física	
Registro original: 	Embrapa Pecuária Sudeste (CPPSE)	
Exemplares: 	CPPSE - (15979-1) - UPC - AP - DD - PROCI-2005.00187 - LIN - 2005.00187 - DIS