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An electrophoretic ion analyzer for on-site autonomous water monitoring

Liu, S, Pan, Z, Liang, Y, Li, F ORCID: 0000-0002-8088-1981, Breadmore, MC ORCID: 0000-0001-5591-4326 and Zhang, M ORCID: 0000-0002-6845-9964 2021 , 'An electrophoretic ion analyzer for on-site autonomous water monitoring' , Journal of Chromatography A, vol. 1637 , pp. 1-10 , doi: 10.1016/j.chroma.2020.461791.

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Abstract

An on-site ion analyzer based on capillary electrophoresis with pressure-driven flow through injection and capacitively coupled contactless conductivity detection has been developed for field monitoring of cations and anions in environmental waters. Automated time-pressure based hydrodynamic injection provides stable pL-nL scale injection (RSD = 1.96%, n = 30). A mixture of 400 mM Bis-Tris, 400 mM MOPS and 2 mM 18-crown-6 is used as the background electrolyte to provide repeatable separations. A proprietary hydrophilic coated 25 μm id capillary is used to suppress the electroosmotic flow. Separations of anions (Cl-, NO3-, NO2-, SO42-, F- and PO43-) and cations (NH4+, K+, Na+, Ca2+ and Mg2+) are achieved by switching the polarity of the high voltage power supply in two individual runs. Signal fluctuations caused by the temperature or viscosity changes in on-site monitoring are corrected by on-line introduction of internal standards. RSDs of the migration time and the corrected peak height over ~35 h and 350 analysis cycles are +) to 6.8 μM (PO43-).  The feasibility for on-site water monitoring with this system has been validated by a standard Ion chromatography method with comparable results obtained.

Item Type: Article
Authors/Creators:Liu, S and Pan, Z and Liang, Y and Li, F and Breadmore, MC and Zhang, M
Keywords: capillary electrophoresis, on-site environmental monitoring, automated flow through injection, capacitively coupled contactless conductivity detection, analytical chemistry
Journal or Publication Title: Journal of Chromatography A
Publisher: Elsevier Science Bv
ISSN: 0021-9673
DOI / ID Number: 10.1016/j.chroma.2020.461791
Copyright Information:

© 2020 Elsevier B.V.

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