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

作者：dos Santos Vagner B; Fava Elson L; de Miranda Curi Newton S; Faria Ronaldo C; Fatibello Filho Orlando

来源：Talanta, 2014, 126: 82-90.

DOI：10.1016/j.talanta.2014.03.015

• Bismuth film electrode
• Screen-printed electrode
• Flow-batch analysis
• Thermostated control
• Electrochemical flow cell

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.

• 出版日期2014-8-1