[Direct determination of Nb in titanium oxide using slurry sample introduction by axial viewing inductively coupled...

By using dispersant polyacrylate amine (NH4PAA) to disperse TiO2, effects of different dispersants, pH value and the amount of dispersant on TiO2 slurry were investigated. The pH value of the medium and the dispersant amount were optimized, and a stable and homogeneous suspension was prepared. Nb in TiO2 was determined by an axial viewing ICP-OES spectrometer. At the same time, the performance of the axial viewing ICP-OES using solid powder analysis was discussed. Under the optimum experimental conditions, the detection limit of the present method is 3.0 microg x L(-1) and the RSD is 3.1% (n = 3, c = 0.3 mg x L(-1)).