345684.fig.002
Figure 2: The potentiometric titration curves of Phen with Sc(III), Y(III), and La(III) in 0.1 M KNO3 at 25°C. (1 : 1) Sc(III) : Phen ( = 9.668 × 10−2 M, = 9.668 × 10−2 M), (1 : 1) Y(III) : Phen ( = 1.040 × 10−1 M, = 1.040 × 10−1 M), (1 : 1) La(III) : Phen ( = 9.180 × 10−2, = 9.180 × 10−2 M).