From: Effective cleaning of copper stained calcareous stone
β n = [MLn]/[M][L]n; β n = K1 × K2 × …..Kn; [x] = ref.
Metal ion
NH3 [11]
en [11]
cyclam [12]
ala [13]
tyr [14]
cys [15]
edta [16]
Cu (II)
13.0 (β4)
20.6 (β2)
27.2
15.0 (β2)
14.6 (β2)
16.0 (β2)
18.7
Ca (II)
–
1.2 (K1)
0.2 (K1)
2.5 (K1)
10.6
