Table 1.
Stability constants and SIT ion interaction parameters at 25 °C used in this work
| Equilibrium reaction | I m (mol·kg−1) | Stability constant log10 K | Specific ion interaction parameters (NaCl) ∆ε (mol·kg−1) |
|---|---|---|---|
| H+ + HEDTA3− ⇌ H2EDTA2− | 0 | 6.80 ± 0.02 | 0.40 ± 0.03 |
| H+ + EDTA4− ⇌ HEDTA3− | 0 | 11.24 ± 0.03 | 0.55 ± 0.04 |
| 0.22 | 10.24 ± 0.03 | ||
| 0.51 | 10.12 ± 0.03 | ||
| 1.02 | 10.21 ± 0.04 | ||
| 2.09 | 10.51 ± 0.06 | ||
| 2.64 | 10.74 ± 0.08 | ||
| Na+ + EDTA4− ⇌ NaEDTA3− | 0 | 2.80 ± 0.20 | 0.27 ± 0.33 |
| 0.22 | 1.74 ± 0.22 | ||
| 0.51 | 1.54 ± 0.31 | ||
| 1.02 | 1.44 ± 0.52 | ||
| 2.09 | 1.51 ± 1.0 | ||
| 2.64 | 1.59 ± 1.3 |