Figure 3From: Highly selective colorimetric detection and preconcentration of Bi(III) ions by dithizone complexes anchored onto mesoporous TiO2Color changes and spectral patterns. (a) The sequence of concentration-dependent changes in color of TiO2-DZ nanosensor after the detection of Bi(III) ions at different concentrations. (b) Spectral patterns obtained with DZ in the absence (blank) and in the presence of 0.5 ppm Bi(III) ions after 1-min reaction time at pH 4.Back to article page