NaHCO3 concentration in different stages.
| Stage | Time | Concentration (mg L−1) |
|---|---|---|
| I | 1–46 | 300–1100 |
| 100/5 d | ||
| II | 47–52 | 1500 |
| 53–58 | 2000 | |
| 59–63 | 3000 | |
| 64–70 | 900 |
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