Determination of triazine herbicide residues in water samples by on-line sweeping concentration in micellar electrokinetic chromatography

AbstractAbstract Separation of enantiomers represents an extremely important task in the field of analytical chemistry. This paper contributes to the field of the on-line preconcentration of enantiomers by developing a novel setup based on the electrokinetic accumulation of ketoprofen enantiomers on the pH boundary followed by enantioselective mobilization by a mixture of SDS, sulfated-β-cyclodextrin (S-β-CD), and trimethyl-β-cyclodextrin (TM-β-CD). Under the best conditions, where the injection electrolyte was composed of 50 mmol L−1 borate/NaOH pH 9.5 with 60% (v/v) methanol, the background electrolyte contained 50 mmol L−1 phosphate/NaOH pH 2.5, and the mobilization electrolyte consisted of 50 mmol L−1 phosphate/NaOH pH 2.5 with 4.0% (w/v) S-β-CD, 0.5% (w/v) TM-β-CD, and 20 mmol L−1 SDS, the determination of nanomolar concentration levels of ketoprofen enantiomers was successful by using micellar electrokinetic chromatography with a common UV detection. LODs were 2.5 nmol L−1 and 3.4 nmol L−1, which represent enhancement factors of 9921 and 8529, respectively. The method was also applied to the determination of ketoprofen enantiomers in waste water samples by using simple filtration as a clean-up step. Here, the recovery of ketoprofen enantiomers was 91% at the concentration level of 5×10−9 mol L−1. Graphical abstract

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Determination of eight triazine herbicide residues in cereal and vegetable by micellar electrokinetic capillary chromatography with on-line sweeping

Food Chemistry ◽

10.1016/j.foodchem.2013.08.028 ◽

2014 ◽

Vol 145 ◽

pp. 41-48 ◽

Cited By ~ 37

Author(s):

Rou Fang ◽

Guan-hua Chen ◽

Ling-xiao Yi ◽

Yu-xiu Shao ◽

Li Zhang ◽

...

Keyword(s):

Micellar Electrokinetic Capillary Chromatography ◽

Capillary Chromatography ◽

Triazine Herbicide ◽

Herbicide Residues ◽

On Line ◽

Electrokinetic Capillary Chromatography

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A sweeping-micellar electrokinetic chromatography method for the detection of three chlorophenols in cosmetic samples

Acta Chromatographica ◽

10.1556/1326.2020.00812 ◽

2020 ◽

Author(s):

Zhihan Zheng ◽

Xiaobin Li ◽

Fangfang Gao ◽

Huitao Liu ◽

Yuan Gao

Keyword(s):

Micellar Electrokinetic Chromatography ◽

Signal To Noise Ratio ◽

Sodium Dodecyl ◽

Electrokinetic Chromatography ◽

Chromatography Method ◽

Sample Matrix ◽

Pressure Injection ◽

Relative Standard ◽

On Line

AbstractA sweeping micellar electrokinetic chromatography (sweeping-MEKC) enrichment model was established for the determination of three chlorophenols (CPs) in cosmetics, namely, bithionol, pentachlorophenol (PCP), and 2,4,6-trichlorophenol (2,4,6-TCP). The optimum electrophoretic conditions were 20 mM NaH2PO4-80 mM sodium dodecyl sulfate (SDS) and 30% (v/v) acetonitrile (pH 2.3). The optimum on-line concentration conditions were as follows: sample matrix, 100 mM NaH2PO4; pressure injection at 20.67 kPa (3 psi) for 25 s. The linear range of bithionol, PCP, and 2,4,6-TCP are 0.20–4.00 μg mL−1, 0.10–2.00 μg mL−1, and 0.05–2.00 μg mL−1 respectively, with correlation coefficient (r) over 0.9972. The limits of detection (LOD) based on three times the signal-to-noise ratio (S/N = 3) are in the range of 0.0061–0.024 μg mL−1. Recoveries for the three CPs in powder and lotion samples are between 79.7 and 110.2% with relative standard deviation (RSD) of 1.38–5.54% and 92.2–121.3% with RSD of 0.72–6.09%, respectively. The proposed method can provide reference for the determination of trace CPs in different sample matrix.

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