Abstract
The chromatographic behavior of molybdic heteropoly acids of silicon and phosphorus as ion pairs with tetrabutylammonium bromide was studied by ion-pair high-performance liquid chromatography on the C18reversed phase (UV detection at 310 nm). Heteropoly acids were preconcentrated as ion pairs with tetrabutylammonium bromide to increase the sensitivity of the determination. Optimal conditions were selected for the chromatographic determination of silicon and phosphorus in water in the presence of each other. Detection limits for silicon and phosphorus are (1.1 × 0.3) × 10–3and (6.7 × 1.2) × 10–3μg/mL, respectively. Calibration plots are linear in the concentration ranges 0.01–0.1 μg/mL (silicon) and 0.02–0.15 μg/mL (phosphorus). The procedure was used for the analysis of distilled water.
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