Autor(es):
Pauliukaite, Rasa 
; Ghica, Mariana Emilia ; Brett, Christopher M. A.
Data: 2005
Identificador Persistente: http://hdl.handle.net/10316/7793
Origem: Estudo Geral - Universidade de Coimbra
Detalhes do Documento
A new, improved sensor for ascorbate determination at copper hexacyanoferrate m...
Descrição
A new, improved sensor for the electrocatalytic determination of ascorbate has been developed that has both a low applied operating potential and a low detection limit. The sensor was constructed by depositing copper hexacyanoferrate film either electrochemically or chemically onto carbon film electrode, and it was then characterised by cyclic voltammetry and electrochemical impedance spectroscopy. Chemically deposited films were shown to be the best for ascorbate determination and were used as an amperometric sensor at +0.05 V versus SCE to determine ascorbate in wines and juice. The linear range extended to 5 mM with a limit of detection of 2.1 µM, the sensor was stable for more than four months, and it could be used continuously for at least 20 days. http://dx.doi.org/10.1007/s00216-004-2958-6
A new, improved sensor for the electrocatalytic determination of ascorbate has been developed that has both a low applied operating potential and a low detection limit. The sensor was constructed by depositing copper hexacyanoferrate film either electrochemically or chemically onto carbon film electrode, and it was then characterised by cyclic voltammetry and electrochemical impedance spectroscopy. Chemically deposited films were shown to be the best for ascorbate determination and were used as an amperometric sensor at +0.05 V versus SCE to determine ascorbate in wines and juice. The linear range extended to 5 mM with a limit of detection of 2.1 µM, the sensor was stable for more than four months, and it could be used continuously for at least 20 days. http://dx.doi.org/10.1007/s00216-004-2958-6
Tipo de Documento
Artigo
Idioma Inglês
Idioma Inglês
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