Chip-based ion chromatography (chip-IC) with a sensitive five-electrode conductivity detector for the simultaneous detection of multiple ions in drinking water  

作　　者：Xiaoping Li Honglong Chang 

机构地区：[1]Ministry of Education Key Laboratory of Micro/Nano Systems for Aerospace,School of Mechanical Engineering,Northwestern Polytechnical University,710072 Xi’an,P.R.China

出　　处：《Microsystems & Nanoengineering》2020年第1期530-537,共8页微系统与纳米工程（英文）

基　　金：We acknowledge the financial support from the Shaanxi Key Research and Development Program(Grant No.2019ZDLGY02-06&Grant No.2016KTCQ01-48);the Fundamental Research Funds for the Central Universities(Grant No.3102019JC002).

摘　　要：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^(−),NO_(3)^(−),and SO _(4)^(2−))were separated in less than 8 min,and a detection limit(LOD)of 0.6 mg L^(−1) was achieved for SO_(4)^(2−).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.

关 键 词：CONDUCTIVITY ELECTRODE CHROMATOGRAPHY 

分 类 号：TP27[自动化与计算机技术—检测技术与自动化装置]