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| entry | pH (before the Claus reaction) | pH (after the Claus reaction) | RS/% |
|---|---|---|---|
| 1 | 2.12 | 7.02 | 49.9 ± 1.0 |
| 2 | 3.52 | 7.21 | 37.3 ± 1.2 |
| 3 | 5.05 | 7.96 | 34.8 ± 1.1 |
| 4 | 5.95 | 7.82 | 19.7 ± 1.0 |
| 5 | 7.07 | 7.34 | 0.2 ± 1.1 |
The conditions of the Claus reaction: the concentration of NaHSO3, 1 mol/L; initial pressure of H2S, 1.1 MPa; the temperature, 40.0 °C.
