Quality index:
| Control project | Indicator | ||
| superior grade | top grade | qualified | |
|
Sulfuric acid(H2SO4)ω/ % ≥ |
92.5 or 98.0 | 92.5 or 98.0 | 92.5 or 98.0 |
| ash content ω/ % ≤ | 0.02 | 0.03 | 0.10 |
| ferrum (Fe)ω/ % ≤ | 0.005 | 0.010 | — |
| arsenic (As) ω/ % ≤ | 0.0001 | 0.005 | — |
| Mercury (Hg)ω/ % ≤ | 0.001 | 0.01 | — |
| lead (Pb)ω/ % ≤ | 0.005 | 0.02 | — |
| transparency / mm ≥ | 80 | 50 | — |
| chroma | Not deeper than the standard color | ||
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