Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/5941
Título: Construction and use of a tubular picrate ion-selective electrode for reducing sugar determination in Port wine by flow-injection analysis
Autor: Lopes, Teresa I. M. S.
Rangel, António O. S. S.
Lima, José L. F. C.
Montenegro, M. Conceição B. S. M.
Palavras-chave: Flow injection
Ion selective electrodes
Picrate
Sugar
Wine
Data: 1995
Editora: Elsevier
Citação: LOPES, Teresa I. M. S....[et al] - Construction and use of a tubular picrate ion-selective electrode for reducing sugar determination in Port wine by flow-injection analysis. Analytica Chimica Acta. ISSN 0003.2670. Vol. 308 n.º 1-3 (1995), p.122-128
Resumo: A picrate ion-selective electrode without inner reference solution and based on bis(triphenylphosphoranylidene)ammonium picrate dissolved in 2-nitrophenyloctyl ether was constructed and its characteristics assessed. With respect to reducing sugar determination in Port wine, a tubular electrode based on the same sensor system was developed and incorporated into a flow-injection manifold devised for this determination. The methodology involves a reaction between the reducing sugar and picric acid, the decrease in the picrate concentration being monitored with the tubular electrode. A linear dependence between peak width, at a fixed potential and the logarithm of sugar concentration in the range 25–200 g l−1 was obtained. The proposed system allows wine samples to be injected with no previous treatment and allows a sample throughput of 50 determinations per hour, a relative standard deviation less than 4%, and the results are comparable to the reference procedures.
Peer review: yes
URI: http://hdl.handle.net/10400.14/5941
Versão do Editor: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TF4-3YKKPCP-F&_user=2460358&_coverDate=06%2F09%2F1995&_rdoc=1&_fmt=high&_orig=gateway&_origin=gateway&_sort=d&_docanchor=&view=c&_searchStrId=1758395333&_rerunOrigin=google&_acct=C000057417&_version=1&_urlVersion=0&_userid=2460358&md5=50a6a637fc94514cc0235ab378a3e585&searchtype=a
Aparece nas colecções:ESB - Artigos em revistas internacionais sem Arbitragem / Papers in international journals without Peer-review

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