Abstract
A high-performance liquid chromatograph equipped with a C 8 reversed-phase column and fluorescence detector was investigated for the selective determination of toxic chemicals at residue (ng) levels. Of 75 compounds (pesticides, metabolites, and a few industrial chemicals) initially studied, 35 compounds were successfully chromatographed and detected at residue levels. An acetonitrile—water gradient mobile phase was used to chromatograph most of the naphthalene and heterocyclic compounds. Two hydroxycoumarin compounds were chromatographed with an acetonitrile—aqueous 1% acetic acid mobile phase and detected after post-column addition of base for maximum fluorescence. The benzimidazole compounds were chromatographed using an acetonitrile-aqueous 0.07 M triethylamine-phosphate (ph 7.1) gradient mobile phase.
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