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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