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The contents of humic acid and heavy metals in the product and the comparison with the standard.
| Indexes | In the standard | In the product |
|---|---|---|
| Humic acid (g/L) | ≥30 | 15.2 |
| As (mg/L) | ≤10 | 0.56 |
| Cd (mg/L) | ≤10 | 0.41 |
| Pb (mg/L) | ≤50 | 5.31 |
(SO2: 2500 ppm; gas flow: 0.12 m3/h; absorption solution: 100 mL; O2: 5 vol%; 25°C.)
