Cationic selective exhaustive injection-sweeping

Figure 26-34 Cation-selective exhaustive injection—sweeping.

CSEI-sweep cationic selective exhaustive injection-sweeping... 

K. Isoo and S. Terabe, Analysis of Metal Ions by Sweeping via Dynamic Complexation and Cation-Selective Exhaustive Injection in Capillary Electrophoresis, Anal. Chem. 2003, 75, 6789. 

Isoo, K. and Terabe, S., Analysis of metal ions by sweeping via dynamic complexation and cation-selective exhaustive injection in capillary electrophoresis. Anal. Chem., 75, 6789, 2003. 

Combinations of online procedures are often employed in environmental applications. Examples include the analysis of trace metal ions in factory wastewater by a combination of cation-selective exhaustive injection (CSEI) (a form of stacking, CZE format) and sweeping. In this latter case, sweeping was promoted by dynamic complexation with EDTA, used as carrier. The same CSEI principle has also been applied to the analysis of quaternary ammonium herbicides and environmentally relevant aromatic amines in water, both followed by sweeping with SDS. 

Quirino, J. P. and Terabe, S., Approaching a million-fold sensitivity increase in capillary electrophoresis with direct ultraviolet detection Cation-selective exhaustive injection and sweeping, Analytical... 

Cation- and anion-selective exhaustive injection sweeping (CSEI-sweep and ASEI-sweep) techniques are also available in MEKC. CSEI-sweep and ASEI-sweep are combinations of two online preconcentration techniques, sample stacking with electrokinetic injection and sweeping, that can provide more than 100,000-fold enhancements in detection sensitivity. An electropherograms of tap water analysis by CSEI-sweep-MEKC is illustrated in Figure 7. The results of this study suggest that CSEI-sweep-MEKC can be used for the analysis of quaternary ammonium herbicides in drinking water. 

Lin Y-H, Li J-H, Ko W-K, Wu S-M (2006) Direct and sensitive analysis of methamphet-amine, ketamine, morphine and codeine in human urine by cation-selective exhaustive injection and sweeping micellar electrokinetic chromatography. J Chromatogr A 1130(2) 281-286... 

Chiang H-Y, Sheu S-J (2004) Analysis of ephedra-alkaloids using sweeping and cation-selective exhaustive injection and sweeping micellar electrokinetic chromatography methods. Electrophoresis 25 670-676. doi 10.1002/elps.200305729... 

---