Determination of titanium(IV) in river water by ion-pair reversed-phase high-performance liquid chromatography with 4,4′-diantipyrylmethane

Abstract

An ion-pair reversed-phase high-performance liquid chromatographic method for the selective determination of Ti^IV with 4,4′-diantipyrylmethane (DAM) is described. The Ti^IV–DAM complex was separated on an ODS column using acetonitrile–water (30 + 70) containing 1 × 10^–4 mol dm^–3 DAM, 0.01 mol dm^–3 ammonium iodide and 0.02 mol dm^–3 chloroacetate (pH 2.25). The detection limit for Ti^IV with the proposed method is 1.8 µg l^–1. Titanium(IV) in river water can be determined without the interference of foreign ions after pre-concentration.