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Chip-based ion chromatography (chip-IC) with a sensitive five-electrode conductivity detector for the simultaneous detection of multiple ions in drinking water
Microsystems & Nanoengineering ( IF 7.3 ) Pub Date : 2020-08-24 , DOI: 10.1038/s41378-020-0175-x
Xiaoping Li 1 , Honglong Chang 1
Affiliation  

The emerging need for accurate, efficient, inexpensive, and multiparameter monitoring of water quality has led to interest in the miniaturization of benchtop chromatography systems. This paper reports a chip-based ion chromatography (chip-IC) system in which the microvalves, sample channel, packed column, and conductivity detector are all integrated on a polymethylmethacrylate (PMMA) chip. A laser-based bonding technique was developed to guarantee simultaneous robust sealing between the homogeneous and heterogeneous interfaces. A five-electrode-based conductivity detector was presented to improve the sensitivity for nonsuppressed anion detection. Common anions (F, Cl, NO3, and SO42−) were separated in less than 8 min, and a detection limit (LOD) of 0.6 mg L−1 was achieved for SO42−. Tap water was also analyzed using the proposed chip-IC system, and the relative deviations of the quantified concentration were less than 10% when compared with that a commercial IC system.



中文翻译:

基于芯片的离子色谱 (chip-IC),配备灵敏的五电极电导检测器,可同时检测饮用水中的多种离子

对水质准确、高效、廉价和多参数监测的新兴需求引起了对台式色谱系统小型化的兴趣。本文报道了一种基于芯片的离子色谱 (chip-IC) 系统,其中微型阀、样品通道、填充柱和电导检测器都集成在聚甲基丙烯酸甲酯 (PMMA) 芯片上。开发了一种基于激光的键合技术,以确保同质和异质界面之间同时进行牢固的密封。提出了一种基于五电极的电导检测器,以提高非抑制阴离子检测的灵敏度。常见阴离子(F -、Cl -、NO 3 -和 SO 4 2-) 的分离时间不到 8 分钟,SO 4 2-的检测限 (LOD) 为 0.6 mg L -1。还使用建议的芯片 IC 系统分析自来水,与商业 IC 系统相比,定量浓度的相对偏差小于 10%。

更新日期:2020-08-24
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