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In-Capillary Derivatization and Preconcentration for CE of Metal Ions as Their Phenanthroline Complexes

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Abstract

A simple and automated method involving in-capillary derivatization and in-capillary preconcentration was developed for the simultaneous determination of metal ions by capillary zone electrophoresis. Fe(II), Zn(II), Cu(II) and Cd(II) were derivatized using 1,10-phenanthroline as the derivatizing agent. The in-capillary derivatization and in-capillary preconcentration via large volume injection were performed sequentially as follows: 60 mmol L−1 1,10-phenanthroline was first hydrodynamically injected (0.2 psi) for 2 s; metal ions were introduced by hydrodynamic injection (0.5 psi) for 60 s; 0.2 mol L−1 acetate pH 5.5 containing 20 % methanol was used as the running buffer. Four metal ions can be determined within 8 min using 16 kV. The resulting preconcentration factors were in the range 12–21. Good linearity was obtained for concentrations of 0.1–8.0 mg L−1 (r 2 > 0.990). The mean recoveries of the metal ions evaluated by fortification of wine samples were in the range 90–102 %. The limits of detection ranged from 0.05 to 0.2 mg L−1. The proposed method can be applied for directly determining metal ions in wine samples.

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Acknowledgments

Financial support from the Center of Excellence for Innovation in Chemistry (PERCH–CIC), Commission on Higher Education, Ministry of Education, Thailand and the Thailand Research Fund (TRF) through the Royal Golden Jubilee (RGJ) Ph.D. Program (Grant No. PHD/0354/2551) to Suthasinee Boonchiangma and Supalax Srijaranai are gratefully acknowledged. The valuable suggestions from Prof. Dr. Richard L. Deming (Department of Chemistry and Biochemistry, California State University, Fullerton, CA) are also acknowledged.

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Correspondence to Supalax Srijaranai.

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Boonchiangma, S., Kukusamude, C., Ngeontae, W. et al. In-Capillary Derivatization and Preconcentration for CE of Metal Ions as Their Phenanthroline Complexes. Chromatographia 77, 277–286 (2014). https://doi.org/10.1007/s10337-013-2586-4

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  • DOI: https://doi.org/10.1007/s10337-013-2586-4

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