Automated determination of pyrethroid insecticides in surface water by column liquid chromatography with diode array UV detection, using on-line micelle-mediated sample preparation |
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Authors: | E R Brouwer E A Struys J J Vreuls and U A T Brinkman |
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Institution: | (1) Department of Analytical Chemistry, Free University, de Boelelaan 1083, NL-1081 HV Amsterdam, The Netherlands |
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Abstract: | A liquid chromatographic method using gradient elution and diode array UV detection for the trace level determination of seven synthetic pyrethroids is described. The procedure involves automated on-line preconcentration on precolumns containing octadecylbonded silica using a Prospekt. Although the analytes display a mixed hydrophobic/hydrophilic behaviour, both breakthrough on the precolumn and adsorption to inner walls and surfaces can be prevented by adding Brij-35, a neutral surfactant, to the aqueous sample. The procedure has been tested for the analysis of surface water; detection limits typically are at the sub- g/l level and repeatability is excellent. The automated system is robust and there are no maintenance problems.Dedicated to Professor Dr. Dieter Klockow on the occasion of his 60th birthday |
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