A renewable copper electrode as an amperometric flow detector for nitrate determination in mineral water and soft drink samples


Autoria(s): GAMBOA, Juan C. M.; PENA, Roselyn C.; PAIXAO, Thiago R. L. C.; BERTOTTI, Mauro
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

20/10/2012

20/10/2012

2009

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

http://dx.doi.org/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