A thermostated electrochemical flow cell with a coupled bismuth film electrode for square-wave anodic stripping voltammetric determination of cadmium(II) and lead(II) in natural, wastewater and tap water samples

Autor(es)

dos Santos, Vagner B. ^[1] ; Fava, Elson L. ^[1] ; de Miranda Curi, Newton S. ^[2] ; Faria, Ronaldo C. ^[1] ; Fatibello-Filho, Orlando ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Ctr Ciencias Exatas & Tecnol, Dept Quim, BR-13560970 Sao Carlos, SP - Brazil

^[2] FAC, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Talanta; v. 126, p. 82-90, AUG 1 2014.
• Citações Web of Science: 21

Resumo

In order to reduce the sample consumption and waste generation for electrochemical purposes, a screen-printed electrode (SPE) used for electrodeposition of bismuth film (SPE-BiFE) and a thermostated electrochemical flow cell (EFC) were developed. The SPE-BiFE with the EFC was employed to determine Cd2+ and Pb2+ ions in natural, wastewater and tap water samples by square-wave anodic stripping voltammetry (SWASV). For this, the flow-batch analysis (FBA) approach based on solenoid micro-pumps and three-way valves was developed to carry out a fully automated procedure with temperature control. Furthermore, the FBA and the SWASV parameters were optimized, on line simultaneous determination of Cd2+ and Pb2+ ions was performed and two analytical curves were linearly acquired in the concentration ranges from 6.30 to 75.6 mu g L-1 and from 3.20 to 38.4 mu g L-1, respectively. Moreover, limits of detection of 0.60 mu g L-1 and 0.10 mu g L-1 for Cd2+ and Pb2+, respectively, were obtained. Studies of precision for the same SPE-BiFE and repeatability for five built SPE-BiFE were carried out for Cd2+ and Pb2+ ion measurements and RSD of 4.1% and 2.9% (n=3) with repeatabilities (n=5) of 6.5% and 8.0% were respectively obtained for both analytes. Besides, a low consumption of 700 mu L of reagents and a sampling frequency of 13 h(-1) were acquired. Simplicity, fast response, accuracy, high portability, robustness and suitability for in loco analyses are the main features of the proposed electroanalytical method. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 10/11690-0 - Desenvolvimento e aplicação de um potenciostato /galvanostato microprocessado portátil para o monitoramento in situ e on-line de íons metálicos em amostras ambientais
• Beneficiário: Orlando Fatibello Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/14993-1 - Caracterização e quantificação de monoalquil carbonatos em meio aquoso empregando dispositivos microfluídicos acoplado a um espectrômetro de massas
• Beneficiário: Vagner Bezerra dos Santos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado