Figure 9: Cyclic voltammograms of thulium(III)-arsenazo III complex in absence of and presence of DNA (50.0 mM tris-HCl buffer, pH 7.40). cDNA = 1 × 10−5 mol·L−1; cThulium (III)-arsenazo III = 5.00 × 10−6 mol·L−1; scan rate = 50 mV/s.