检出限
化学
微流控
参比电极
电极
线性
分析化学(期刊)
工作电极
纳米技术
环境化学
色谱法
电化学
材料科学
电子工程
物理化学
工程类
作者
Junjie Dai,Wanlei Gao,Jiawen Yin,Lijuan Liang,Jie Zou,Qinghui Jin
标识
DOI:10.1016/j.aca.2021.338511
摘要
Pollution due to heavy metals is becoming increasingly hazardous; therefore, demand for the large-scale deployment of sensor nodes for water quality monitoring has increased. The development of integrated and miniaturised sensors for detecting heavy metals is necessary. Herein, an integrated microfluidic sensor based on a “glass-silicon-glass” sandwich structure is proposed for Pb2+ detection. This micro-sensor consists of a nanochannel liquid conjunct Ag/AgCl reference electrode(RE), a working electrode with a three-dimensional Au micropillar array, and a detection chamber for sample measurement. The potential fluctuation of the RE in this sensor was only 0.62% over seven days, remaining relatively stable. Under optimal conditions, the limit of detection and sensitivity for lead were 0.13 μg L−1 (S/N = 3) and 52.30 nA (μg L−1)−1, respectively. The linearity of the sensor for detecting lead was good in the concentration range of 0.50–150 μg L−1 (R2 = 0.9989). Moreover, the proposed microsensor showed high selectivity for Pb2+ and achieved sensitive detection of trace Pb2+ in different water samples. Therefore, this integrated and miniaturised sensor is a practical tool for trace lead detection, allowing the development of large scale sensor network for water monitoring.
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