Wu Qijun, He Jiaqi, Meng Hu, Wang Yu, Zhang Yu, Li Hui, Feng Liang
School of Chemical Engineering, Guizhou Institute of Technology, Guiyang, 550003, PR China; Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, 116023, PR China.
Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, 116023, PR China.
Talanta. 2019 Nov 1;204:518-524. doi: 10.1016/j.talanta.2019.06.006. Epub 2019 Jun 4.
Monitoring of copper(II) ion is critical for water safety. Herein, a solid phase extraction (SPE) column filled with home-made sulfonated PS-DVB microspheres was adopted to eliminate interference from other co-existing ions. Meanwhile, 1-(2-pyridylazo)-2-naphthol (PAN) as colorimetric reactant was dispersed in polyvinyl butyral (PVB) and immobilized on the filter paper. The as-fabricated paper-based microfluidic analytical device (μPAD) combined with home-made SPE column was utilized for the selective and quantitative determination of copper(II) ion. The selectivity and sensitivity for copper(II) ion were significantly enhanced by SPE-combined μPAD. The sensor has a noticeable color change in the presence of copper(II) ion. The limit of detection was as low as 0.340 μM, which is much less than the drinking water guidelines in many countries and organizations. This technology is convenient and does not need any expensive instrumentation and professional skills. It is easily used to achieve rapid and on-site assessment of copper(II) ion in real-world situations.
铜（II）离子的监测对水安全至关重要。在此，采用填充有自制磺化聚苯乙烯-二乙烯基苯微球的固相萃取（SPE）柱来消除其他共存离子的干扰。同时，将1-（2-吡啶偶氮）-2-萘酚（PAN）作为比色反应物分散在聚乙烯醇缩丁醛（PVB）中并固定在滤纸上。所制备的纸基微流控分析装置（μPAD）与自制的SPE柱相结合，用于选择性和定量测定铜（II）离子。SPE与μPAD相结合显著提高了对铜（II）离子的选择性和灵敏度。该传感器在铜（II）离子存在下有明显的颜色变化。检测限低至0.340 μM，远低于许多国家和组织的饮用水标准。该技术操作简便，无需任何昂贵的仪器设备和专业技能。它易于用于在实际场景中快速实现对铜（II）离子的现场评估。
