2003
DOI: 10.1002/elps.200305460
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Effect of NaOH on large‐volume sample stacking of haloacetic acids in capillary zone electrophoresis with a low‐pH buffer

Abstract: Large-volume sample stacking (LVSS) is an effective on-capillary sample concentration method in capillary zone electrophoresis, which can be applied to the sample in a low-conductivity matrix. NaOH solution is commonly used to back-extract acidic compounds from organic solvent in sample pretreatment. The effect of NaOH as sample matrix on LVSS of haloacetic acids was investigated in this study. It was found that the presence of NaOH in sample did not compromise, but rather help the sample stacking performance … Show more

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Cited by 18 publications
(13 citation statements)
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“…Most of the on-line preconcentration methods in capillary electrophoresis (CE) are based on changes in analyte migration due to conductivity difference, buffer pH difference or the association between the analytes and the surfactants, and the combination of these approaches. Thus methods such as field-amplified sample stacking (FASS) [5][6][7], field-amplified sample injection (FASI) [8], large-volume stacking using the EOF pump (LVSEP) [9][10][11][12][13][14][15][16], fieldamplified sample injection with matrix removal via an EOF pump (FAEP) [17,18], dynamic pH junction (DypH) [19][20][21], transient isotachophoresis (tITP) [22,23], pseudo-transient isotachophoresis (Pseudo-tITP) [24][25][26][27][28], sweeping [29][30][31][32], micelle collapse (MC) [33,34] and various combinations including electrokinetic surpercharging (EKS) [35][36][37][38][39][40][41], selective exhaustive injection [42] and selective exhaustive injection-sweeping (SEI-sweeping) [43][44][45], dynamic pH junction-sweeping [46], and large-volume stacking using the EOF pu...…”
Section: Introductionmentioning
confidence: 99%
“…Most of the on-line preconcentration methods in capillary electrophoresis (CE) are based on changes in analyte migration due to conductivity difference, buffer pH difference or the association between the analytes and the surfactants, and the combination of these approaches. Thus methods such as field-amplified sample stacking (FASS) [5][6][7], field-amplified sample injection (FASI) [8], large-volume stacking using the EOF pump (LVSEP) [9][10][11][12][13][14][15][16], fieldamplified sample injection with matrix removal via an EOF pump (FAEP) [17,18], dynamic pH junction (DypH) [19][20][21], transient isotachophoresis (tITP) [22,23], pseudo-transient isotachophoresis (Pseudo-tITP) [24][25][26][27][28], sweeping [29][30][31][32], micelle collapse (MC) [33,34] and various combinations including electrokinetic surpercharging (EKS) [35][36][37][38][39][40][41], selective exhaustive injection [42] and selective exhaustive injection-sweeping (SEI-sweeping) [43][44][45], dynamic pH junction-sweeping [46], and large-volume stacking using the EOF pu...…”
Section: Introductionmentioning
confidence: 99%
“…There are three main steps in the LVSS method [3133]: first, the capillary was filled with the running buffer; then the standard or sample was injected by hydrodynamic injection at the pressure of 0.5 psi in short time (about 4 seconds); second, when the sample solution flows into the capillary after a certain length, reversing polarity voltage (about 25 kV) was applied; third, the sample was stacked at the interface between the buffer and the sample zone. When the current reached 95% of the original value, the applied voltage was switched to normal polarity, and the separation was finished.…”
Section: Methodsmentioning
confidence: 99%
“…In an earlier paper the same group employed a similar approach (with respect to the analytical method used) to determine particle phase substituted methoxy phenols and aromatic acids from biomass burning [83]. Switching to the second group of applications, the analysis of organic acids in water samples, haloacetic acids have been determined in tap water by Tu et al [84]. To improve detection limits and allow the analysis of real samples, large volume injection experiments including the use of different concentrations of NaOH (a reagent used for the back-extraction of the selected analytes) were performed.…”
Section: Organic Acids In Environmental Samplesmentioning
confidence: 97%