Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/5875
Título: Flow injection determination of nitrate in vegetables using a tubular potentiometric detector
Autor: Lima, José L. F. C.
Rangel, António O. S. S.
Souto, M. Renata S.
Palavras-chave: Flow injection analysis
Nitrate
Ion-selective electrodes
Vegetables
Data: 1995
Editora: American Chemical Society
Citação: LIMA, José L. F.C.; RANGEL, António O. S.S.; SOUTO, M. Renata S. - Flow injection determination of nitrate in vegetables using a tubular potentiometric detector. Journal of Agriculture and Food Chemistry. ISSN 0021 -8561. Vol. 43 (1995), p. 704-707
Resumo: A flow injection system with potentiometric detection for the determination of nitrate in vegetables was developed. For this purpose a tubular nitrate ion-selective electrode with the ion-exchanger system [(4,7-diphenylphenanthroline)nickel(IId) issolved in o-nitrophenyl octyl ether] immobilized in a PVC membrane and without inner reference solution was prepared. The flow injection manifold incorporating the tubular electrode was used for the determination of nitrate in vegetables (lettuce, parsley, and spinach), using a mixture of lead acetate, lead oxide, and sodium acetate as nitrate extractant, ionic strength adjustor, and interference suppressor solution. The quality of the results obtained by the proposed methodology was assessed by comparing them with those provided by a conventional potentiometric methodology and also through recovery tests (recoveries from 94 to 104% were found). A sampling rate of 120 samples per hour was achieved with a relative standard deviation lower than 2%.
Peer review: yes
URI: http://hdl.handle.net/10400.14/5875
Versão do Editor: http://pubs.acs.org/doi/abs/10.1021/jf00051a027
Aparece nas colecções:ESB - Artigos em revistas internacionais sem Arbitragem / Papers in international journals without Peer-review

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