title: Determination of eight triazine herbicide residues in cereal and vegetable by micellar electrokinetic capillary chromatography with on-line sweeping.
abstract: A new method was developed for the determination of eight triazine herbicide residues in cereal and vegetable samples by on-line sweeping technique in micellar electrokinetic capillary chromatography (MEKC). Some factors affecting analyte enrichment and separation efficiency were examined. The optimum buffer was composed of 25 mM borate, 15 mM phosphate, 40 mM sodium dodecylsulfate (SDS) and 3% (v/v) of 1-propanol at pH 6.5. The separation voltage was 20 kV and the sample was injected at 0.5 psi for 240 s. The detection wavelength was set at 220 nm with the capillary temperature being at 25 °C. Under the optimized conditions, the enrichment factors were achieved from 479 to 610. The limits of detection (LODs, S/N = 3) ranged from 0.02 to 0.04 ng/g and the limits of quantification (LOQs) of eight triazine herbicides were all 0.1 ng/g. The average recoveries of spiked samples were 82.8-96.8%. This method has been successfully applied to the determination of the triazine herbicide residues in cereal and vegetable samples.
authors.affiliation: College of Food and Bioengineering, Jiangsu University, Zhenjiang 212013, China.
authors.forename: Rou
authors.initials: R
authors.lastname: Fang
authors.forename: Guan-hua
authors.initials: GH
authors.lastname: Chen
authors.forename: Ling-xiao
authors.initials: LX
authors.lastname: Yi
authors.forename: Yu-xiu
authors.initials: YX
authors.lastname: Shao
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.forename: Qing-hong
authors.initials: QH
authors.lastname: Cai
authors.forename: Jing
authors.initials: J
authors.lastname: Xiao
mesh_terms: D020374:Chromatography, Micellar Electrokinetic Capillary / Q000379:methods*; D002523:Edible Grain / Q000737:chemistry*; D006540:Herbicides / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D010573:Pesticide Residues / Q000032:analysis*; D014227:Triazines / Q000032:analysis*; D014675:Vegetables / Q000737:chemistry*
chemical_list: D006540:Herbicides; D010573:Pesticide Residues; D014227:Triazines
keywords: Cereal; Micellar electrokinetic capillary chromatography; Sweeping; Triazine herbicide residues; Vegetable