Quality standard: HG/T2826-2008
|
project |
national standard |
Enterprise constant value |
|
|
HG/T2826-2008 |
|||
|
Premium |
First Grade |
||
|
Main content(Na2S2O5),% |
≥96.5 |
≥95.0 |
≥97.0 |
|
Iron content(Fe),% |
≤0.005 |
≤0.010 |
≤0.002 |
|
Water insoluble content,% |
≤0.05 |
≤0.05 |
≤0.02 |
|
As(As),% |
≤0.0001 |
— |
≤0.0001 |
Molecular formula:Na2S2O5
molecular weight:190.10
Appearance: white crystalline powder
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