| Characteristic | Value of characteristic | Control method | Comment | |
| H2SO4 (%) | 35.0 ± 5.0 | Internal method | potentiometric titration | |
| Fe ( mg/l ) | max. 25 | Internal method | Spectrofotometric | |
| Residue on Ignition ( mg/l ) | max. 175 | Internal method | gravimetric | |
| Permanganate index KMnO4 ( mg/l ) |
max. 40 | Internal method | Volumetric | |
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Other concentrations of sulphuric acid
