Table 2. Calibration samples for pH and conductivity-dependent calibration.
| Bottled water | Combination | Final pH | Final χ after pH adjustment |
|---|---|---|---|
| A | A1 | 6.0 | 50.0 µS cm−1 |
| A2 | 6.5 | 45.0 µS cm−1 | |
| A3 | 7.0 | 37.5 µS cm−1 | |
| A4 | 7.5 | 33.5 µS cm−1 | |
| A5 | 8.0 | 25 µS cm−1 | |
| B | B1 | 6.0 | 141.5 µS cm−1 |
| B2 | 6.5 | 136.0 µS cm−1 | |
| B3 | 7.0 | 138.0 µS cm−1 | |
| B4 | 7.5 | 140.0 µS cm−1 | |
| B5 | 8.0 | 141.5 µS cm−1 | |
| C | C1 | 6.0 | 350.0 µS cm−1 |
| C2 | 6.5 | 300.0 µS cm−1 | |
| C3 | 7.0 | 275.0 µS cm−1 | |
| C4 | 7.5 | 241.0 µS cm−1 | |
| C5 | 8.0 | 235.0 µS cm−1 | |
| D | D1 | 6.0 | 442.0 µS cm−1 |
| D2 | 6.5 | 436.0 µS cm−1 | |
| D3 | 7.0 | 426.0 µS cm−1 | |
| D4 | 7.5 | 417.0 µS cm−1 | |
| D5 | 8.0 | 423.0 µS cm−1 | |
| E | E1 | 6.0 | 614.0 µS cm−1 |
| E2 | 6.5 | 603.0 µS cm−1 | |
| E3 | 7.0 | 593.0 µS cm−1 | |
| E4 | 7.5 | 574.0 µS cm−1 | |
| E5 | 8.0 | 585.0 µS cm−1 |