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Abstract
The chelates of Mo(VI) and Mn(II) with 8-hydroxyquinoline were separated on a C18 column by reversed-phase high-performance liquid chromatography (HPLC). The mobile phase was 1:1 acetonitrile/0.02 mol dm−3 acetate buffer (pH 4.1) containing the ligand at 10−3 mol dm−3. The calibration curves were linear over the concentration range from 0.5 to 200 μg dm−3 for both metals using spectrophotometric detection (390 nm). The detection limits were 0.2 μg for Mn(II) and 0.4 μg dm−3 for Mo(VI) at a signal-to-noise ratio of 3, when the metal chelates were formed prior to injection onto a C18 column (pre-column chelation method). The method was applied to the analysis of coastal sea water samples.