Metal Ion

$\log K_1$ (M: L)*

$\log K_2$ (M: L)*

$\log K_3$ (M:L)*

H⁺

7.20

3.80

? ? ?

Al (III)

6.85 (1:1)

4.82 (1:2)

1.61 (1:3)

Pb (II)

4.85 (1:1)

2.85 (1:2)

???

Co (II)

7.65 (1:1)

???

???

Fe (III)

8.85 (1:1)

6.45 (1:2)

???

Ti (II)

7.25 (1:1)

???

???

La (III)

6.05 (1:1)

???

???

Cr (III)

5.64 (1:1)

???

???

Sr (II)

5.45 (1:1)

3.49 (1:2)

???

Th (IV)

4.47 (1:1)

3.24 (1:2)

???

Zr (IV)

7.05 (1:1)

4.93 (1:2)

2.50 (1:3)