Determination of pesticides in waters by automatic on-line solid-phase extraction-capillary electrophoresis.
The separation of seven pesticides by micellar electrokinetic capillary chromatography in spiked water samples is described, allowing the analysis of pesticides mixtures down to a concentration of 50 microg l(-1) in less than 13 min. Calibration, pre-concentration, elution and injection into the sample vial was carried out automatically by a continuous flow system (CFS) coupled to a capillary electrophoresis system via a programmable arm. The whole system was electronically coupled by a micro-processor and completely controlled by a computer. A C18 solid-phase mini-column was used for the pre-concentration, allowing a 12-fold enrichment (as an average value) of the pesticides from fortified water samples. Under the optimal extraction conditions, recoveries between 90 and 114% for most of the pesticides were obtained.
Hinsmann
P
P
Institute of Analytical Chemistry, Vienna University of Technology, Austria.
Arce
L
L
Ríos
A
A
Valcárcel
M
M
D001331:Automation; D002021:Buffers; D019075:Electrophoresis, Capillary / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D010575:Pesticides / Q000032:analysis*; D013501:Surface-Active Agents; D014867:Water / Q000032:analysis*
D002021:Buffers; D010575:Pesticides; D013501:Surface-Active Agents; D014867:Water