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http://dx.doi.org/10.5012/bkcs.2003.24.9.1319

Quantitative Analysis of Seven Triazine Herbicides by On-Line Micellar Electrokinetic Chromatography-Electrospray Ionization Mass Spectrometry  

Kang, Seong-Ho (Department of Chemistry, Chonbuk National University)
Shin, Dae-Ho (Korea Basic Science Institute)
Chang, Yoon-Seok (School of Environment Science and Engineering, Pohang University of Science and Technology)
Publication Information
Bulletin of the Korean Chemical Society / v.24, no.9, 2003 , pp. 1319-1323 More about this Journal
Abstract
This paper presents a successful demonstration of the on-line coupling of MEKC (micellar electrokinetic chromatography) to ESIMS (electrospray ionization mass spectrometry) for the quantitative analysis of seven s-triazine herbicides. The on-line MEKC-ESIMS was used to determine the structure of CE-separated peaks of seven triazine herbicides. The mixture of triazine herbicides was separated in a 20 mM sodium borate buffer (pH 8.5) containing 15 mM sodium dodecylsulfate (SDS) by using a bare fused-silica capillary. Electrospray ionization mass spectrometer was operated in the positive-ion mode when the mass spectra of seven triazine herbicides were observed from each peak, and the solution of water-methanol-formic acid (50/49/1 v/v/v) was used as a sheath liquid. The effects of SDS concentration, the run buffer pH, and the electric field on the separation of seven s-triazine herbicides were investigated. The MEKC-ESIMS detection showed 5 to 10 times higher sensitivity compared to the MEKC-UV detection. In addition, it did not need any pretreatment step.
Keywords
Triazines; On-line MEKC-ESIMS;
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