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-μg/l level and repeatability is excellent. The automated system is robust and there are no maintenance problems.
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Dedicated to Professor Dr. Dieter Klockow on the occasion of his 60th birthday
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Brouwer, E.R., Struys, E.A., Vreuls, J.J. et al. Automated determination of pyrethroid insecticides in surface water by column liquid chromatography with diode array UV detection, using on-line micelle-mediated sample preparation. Fresenius J Anal Chem 350, 487–495 (1994). https://doi.org/10.1007/BF00321794
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DOI: https://doi.org/10.1007/BF00321794