title: Determination of phenylureas herbicides in food stuffs based on matrix solid-phase dispersion extraction and capillary electrophoresis with electrochemiluminescence detection.
abstract: A new method based on matrix solid phase dispersion-capillary electrophoresis with electrochemiluminescence detection (MSPD-CE-ECL) has been developed for the simultaneous determination of three kinds of phenylurea herbicides (PHUs). Poly-β-cyclodextrin (poly-β-CD) was used as an additive in the running buffer to improve the separation of three analytes. The conditions for CE separation, ECL detection and effect of poly-β-CD were investigated in detail. Under the optimal conditions, three kinds of herbicides (isoproturon, linuron and diuron) were well separated and detected within 8 min. The linear ranges of the standard solution for isoproturon and linuron were 1-300 μg L(-1) with a detection limit (S/N=3) of 0.1 μg L(-1), and for diuron was 2-500 μg L(-1) with a detection limit of 0.2 μg L(-1). The average recoveries were in the range of 86.9-102.8%, and all relative standard deviation of the migration time and the ECL intensity in intraday and interday were less than 9.0%. The proposed method was also applied to the determination of three kinds of herbicides in green vegetable and rice samples with recoveries in the range from 78.1 to 93.8%.
authors.affiliation: College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, China. wangyc1819@126.com
authors.forename: Yuanchao
authors.initials: Y
authors.lastname: Wang
authors.forename: Liang
authors.initials: L
authors.lastname: Xiao
authors.forename: Meirong
authors.initials: M
authors.lastname: Cheng
mesh_terms: D019075:Electrophoresis, Capillary / Q000379:methods*; D005504:Food Analysis / Q000379:methods*; D006540:Herbicides / Q000032:analysis* / Q000302:isolation & purification; D057230:Limit of Detection; D016014:Linear Models; D008163:Luminescent Measurements; D012275:Oryza / Q000737:chemistry; D010573:Pesticide Residues / Q000032:analysis* / Q000302:isolation & purification; D010671:Phenylurea Compounds / Q000032:analysis* / Q000302:isolation & purification; D015203:Reproducibility of Results; D052616:Solid Phase Extraction / Q000379:methods*; D014675:Vegetables / Q000737:chemistry; D047392:beta-Cyclodextrins / Q000737:chemistry
chemical_list: D006540:Herbicides; D010573:Pesticide Residues; D010671:Phenylurea Compounds; D047392:beta-Cyclodextrins