Department of Chemical & Biomolecular Engineering and Electronics Design Center, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106, USA.
Sensors (Basel). 2017 Apr 25;17(5):950. doi: 10.3390/s17050950.
This research has developed a simple to use, cost effective sensor system for the detection of lead ions in tap water. An under-potential deposited bismuth sub-layer on a thin gold film based electrochemical sensor was designed, manufactured, and evaluated. Differential pulse voltammetry (DPV) measurement technique was employed in this detection. Tap water from the Cleveland, OH, USA regional water district was the test medium. Concentrations of lead ion in the range of 8 × 10 M to 5 × 10 M were evaluated, showing a good sensitivity over this concentration range. The calibration curve for the DPV measurements of lead ions in tap water showed excellent reproducibility with R² value of 0.970. This DPV detection system required 3-6 min to complete the detection measurement. A longer measurement time of 6 min was used for the lower lead ion concentration. The selectivity of this lead ion sensor was very good, and Fe III, Cu II, Ni II, and Mg II at a concentration level of 5 × 10 M did not interfere with the lead ion measurement.
本研究开发了一种简单易用、经济实惠的传感器系统，用于检测自来水中的铅离子。设计、制造和评估了一种基于薄金膜的电化学传感器上的欠电位沉积铋亚层。差分脉冲伏安法（DPV）测量技术用于该检测。来自美国俄亥俄州克利夫兰地区的自来水作为测试介质。评估了 8×10-7 M 至 5×10-7 M 范围内的铅离子浓度，在该浓度范围内表现出良好的灵敏度。自来水中铅离子的 DPV 测量校准曲线具有出色的重现性，R² 值为 0.970。该 DPV 检测系统完成检测测量需要 3-6 分钟。对于较低的铅离子浓度，使用 6 分钟的较长测量时间。该铅离子传感器具有很好的选择性，5×10-5 M 浓度水平的 Fe III、Cu II、Ni II 和 Mg II 不会干扰铅离子测量。
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