Table I.
Comparison of the affinity constants of EDTA, HEDTA, DPTA, MA, DMA, and NA for ZnII, FeII, and FeIII
| Chelator | Log K for Metal Ion
|
||||
|---|---|---|---|---|---|
| ZnII | FeII | FeIII | ZnII/FeII | FeIII/FeII | |
| EDTAa | 16.0 | 14.3 | 25.1 | 1.12 | 1.76 |
| HEDTAa | 14.6 | 12.2 | 19.8 | 1.20 | 1.62 |
| DTPAa | 18.3 | 16.4 | 28.0 | 1.12 | 1.71 |
| MAb | 12.7 | 10.1 | 17.7 | 1.26 | 1.75 |
| DMAb | 12.8 | 10.4 | 18.4 | 1.23 | 1.77 |
| NAc | 15.4 | 12.8 | n.r.d | 1.20 | n.r. |
a
Data are from Smith and Martell (1989).
b
Data are from Murakami et al. (1989).
c
Data are from Anderegg and Ripperger (1989).
d
n.r., Not reported in the literature.