Highly selective colorimetric detection and preconcentration of Bi(III) ions by dithizone complexes anchored onto mesoporous TiO2

Table 1 Absorbance values at 502 nm for each concentration studied

No.	Concentration of Bi(III) ions in ppm	Absorbance (a.u.)
1	0.001	0.1735
2	0.005	0.1771
3	0.01	0.1842
4	0.05	0.188
5	0.1	0.1936
6	0.5	0.197
7	1.0	0.217