Table 2.
Concentrations, masses, and volumes used for pH and conductivity measurements during CP precipitation.
| Reaction Vessel | Ca(NO3)2 | NTA or EDTA | (NH4)2HPO4 | Solution after Mixing | ||||
|---|---|---|---|---|---|---|---|---|
| c (mM) | V (mL) | c (mM) | M (g) | c (mM) | V (mL) | c(Ca, Pi) (mM) | V (mL) | |
| 1 | 40 | 15 | 0 | 0 a,b | - | - | 20 | 30 |
| A | - | - | - | - | 40 | 15 | ||
| 2 | 40 | 15 | 5 | 0.041 a 0.056 b |
- | - | 20 | 30 |
| B | - | - | - | - | 40 | 15 | ||
| 3 | 40 | 15 | 10 | 0.080 a 0.112 b |
- | - | 20 | 30 |
| C | - | - | - | - | 40 | 15 | ||
| 4 | 40 | 15 | 15 | 0.124 a 0.168 b |
- | - | 20 | 30 |
| D | - | - | - | - | 40 | 15 | ||
Numbered solutions (1, 2, 3, 4) and solutions labeled with a letter (A, B, C, D) denote calcium-containing solutions and phosphate solutions, respectively. a Denotes NTA and b denotes EDTA masses in the solutions.