A renewable copper electrode as an amperometric flow detector for nitrate determination in mineral water and soft drink samples
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2009
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Resumo |
A novel approach was developed for nitrate analysis in a FIA configuration with amperometric detection (E=-0.48 V). Sensitive and reproducible current measurements were achieved by using a copper electrode activated with a controlled potential protocol. The response of the FIA amperometric method was linear over the range from 0.1 to 2.5 mmol L(-1) nitrate with a detection limit of 4.2 mu mol L(-1) (S/N = 3). The repeatability of measurements was determined as 4.7% (n=9) at the best conditions (flow rate: 3.0 mL min(-1), sample volume: 150 mu L and nitrate concentration: 0.5 mmol L(-1)) with a sampling rate of 60 samples h(-1). The method was employed for the determination of nitrate in mineral water and soft drink samples and the results were in agreement with those obtained by using a recommended procedure. Studies towards a selective monitoring of nitrite were also performed in samples containing nitrate by carrying out measurements at a less negative potential (-0.20 V). (C) 2009 Elsevier B.V. All rights reserved. FAPESP (Fundacao de Amparo A Pesquisa do Estado de Sao Paulo) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico) |
Identificador |
TALANTA, v.80, n.2, p.581-585, 2009 0039-9140 http://producao.usp.br/handle/BDPI/31123 10.1016/j.talanta.2009.07.028 |
Idioma(s) |
eng |
Publicador |
ELSEVIER SCIENCE BV |
Relação |
Talanta |
Direitos |
restrictedAccess Copyright ELSEVIER SCIENCE BV |
Palavras-Chave | #Nitrate #Nitrite #Flow injection analysis #Renewable copper surface #Mineral water #Soft drink #ELECTROCHEMICAL DETECTION #ELECTROCATALYTIC REDUCTION #CARBON-DIOXIDE #NITRITE #IONS #INJECTION #SENSOR #ACID #UREA #Chemistry, Analytical |
Tipo |
article original article publishedVersion |