Table 1 The technical parameters and calculation results of humic acids content in replicas
Sample | The volume of ferrous sulfate standard solution consumed during blank test (V0/mL) | The volume of ferrous sulfate standard solution consumed for sample determination (V/mL) | The concentration of ferrous sulfate standard solution (c/ mol/L) | The mass of the powder sample (m/ g) | The content of humic acids (X0/ppm) |
|---|---|---|---|---|---|
Unfired | 49.17 | 44.68 | 0.1 | 0.3269 | 4120.53 |
Firing at 600 ℃ | 49.17 | 48.54 | 0.1 | 0.3276 | 0.58 |
Firing at 800 ℃ | 49.17 | 49.17 | 0.1 | 0.3286 | 0 |
Firing at 1000 ℃ | 49.17 | 49.17 | 0.1 | 0.3808 | 0 |