title: Determination of chlorophenoxy acid herbicides by capillary electrophoresis with integrated potential gradient detection.
abstract: This report describes separation and detection of chlorophenoxy acid herbicides spiked in drinking water by the technique combining solid-phase extraction, field-amplified sample stacking, capillary electrophoresis, and potential gradient detection. The herbicide solution (400 mL) was concentrated to 0.1 mL by the solid-phase extraction procedure. The buffer containing 3 mM ammonia and 0.3 mM hydroxypropyl-beta-cyclodextrin was adjusted to pH 9.0 with ammonia. The sample solution was injected into the capillary to 30% of the whole length, and -9 kV and 9 kV were employed for field-amplified sample stacking and separation, respectively. The herbicides were baseline separated and the detection limits with the above combined techniques were in the range of 1-4 x 10(-2) ng/mL.
authors.affiliation: Department of Chemistry, National University of Singapore.
authors.forename: Weidong
authors.initials: W
authors.lastname: Qin
authors.affiliation: Department of Chemistry, National University of Singapore.|CE Resources Pte Ltd, Singapore, Republic of Singapore.
authors.forename: Sam F Y
authors.initials: SFY
authors.lastname: Li
mesh_terms: D002021:Buffers; D019075:Electrophoresis, Capillary / Q000379:methods*; D006540:Herbicides / Q000032:analysis*; D006863:Hydrogen-Ion Concentration
chemical_list: D002021:Buffers; D006540:Herbicides