A New Electrochemical System Based on a Flow-Field Shaped Solid Electrode and 3D-Printed Thin-Layer Flow Cell: Detection of Pb2+ Ions by Continuous Flow Accumulation Square-Wave Anodic Stripping Voltammetry
A New Electrochemical System Based on a Flow-Field Shaped Solid Electrode and 3D-Printed Thin-Layer Flow Cell: Detection of Pb2+ Ions by Continuous Flow Accumulation Square-Wave Anodic Stripping Voltammetry
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DOI：
10.1021/acs.analchem.7b00383
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发表时间：
2017-05-02
影响因子：
7.4
通讯作者：
Chen, Guosong
中科院分区：
文献类型：
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作者：
Sun, Qianwen;Wang, Jikui;Chen, Guosong
在这里，我们描述了一种新型灵敏的流电化学检测系统，该系统采用新型流场形状固体电极（FFSSE）。该系统由 3D 打印的薄层流通池 (TLFC) 和带 USB 连接的平面丝网印刷 FFSSE 构成。该接口有利于连续流累积方波阳极溶出伏安法 (ASV)。利用有限元法（FEM）模拟了TLFC工作空间的流动分布，并对电极的形状和配置进行了相应的优化。我们演示了使用这种新设计的 TLFC-FFSSE 检测系统对 Pb2+ 进行电化学测定，无需去除样品中的氧气。与传统的基于 ASV 的方法相比，这种基于 TLFC-FFSSE 的系统表现出有吸引力的溶出伏安性能。发现 Pb2+ 检测的线性范围为 0.5-100 μg/L（0.5 至 100 ppb），并且在存在铋作为共沉积金属的情况下实现了 0.2 μg/L（0.2 ppb）的检测限。该系统进一步应用于甲烷发酵生物培养液中Pb2+的检测。电化学检测结果与原子荧光光谱（AFS）分析结果一致，标准添加法平均回收率为95.5-106.5%。与传统的基于 ASV 的方法相比，这种新型流式电化学检测系统表现出更好的灵敏度和重现性。这种系统为现场实时检测重金属提供了巨大的潜力，其中需要紧凑、廉价、稳定和小批量的分析。
Here we describe a new and sensitive flow electrochemical detection system that employs a novel flow-field shaped solid electrode (FFSSE). The system was constructed with a 3D-printed thin-layer flow cell (TLFC) and a flat screen-printed FFSSE with USB connection. This interface facilitates continuous flow accumulation square-wave anodic stripping voltammetry (ASV). The flow distribution in the working space of TLFC was simulated using the finite element method (FEM) and the shape and configuration of electrodes were optimized accordingly. We demonstrated the electrochemical determination of Pb2+ using this newly designed TLFC-FFSSE detection system without removal of oxygen from samples. This TLFC-FFSSE based system showed an attractive stripping voltammetric performance compared to a traditional ASV based method. A linear range for detection of Pb2+ was found to be 0.5-100 mu g/L (0.5 to 100 ppb) and a detection limit of 0.2 mu g/L (0.2 ppb) was achieved in the presence of bismuth as codeposition metal. The system was further applied to detect Pb2+ in biological broths of methane fermentation. The electrochemical detection results were consistent with that obtained from atomic fluorescence spectroscopy (AFS) analysis and the average recovery was found to be 95.5-106.5% using a standard addition method. This new flow electrochemical detection system showed better sensitivity and reproducibility compared to a traditional ASV based method. Such a system offers great potential for on-site and real-time detection of heavy metals where compact, inexpensive, robust, and low-volume analysis is required.