Customization: | Available |
---|---|
CAS No.: | 7783-18-8 |
Formula: | (Nh4)2s2o3 |
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In industry: Used as photofixer, metal cleaning agent, electroplating solution and reducing agent.
Specification
Items | Specification | Results |
Appearance | Colorless Transparent Liquid | Colorless Transparent Liquid |
Content((NH4)2S2O3) w/w % | ≥60.00 | 60.25 |
N w/w% | ≥10 | 12 |
Sulfur w/w % | ≥25 | 26 |
Ignition Residue % | ≤0.1 | 0.02 |
Ammonium sulfite % | ≤1.0 | 0.65 |
Sulfide(S) % | ≤0.0002 | <0.0002 |
Density(20ºC) | 1.290-1.346 | 1.334 |
Insoluble w/w% | ≤0.02 | qualified |
pH (25ºC) | 8~9 | 8.35 |
Fe % | ≤0.001 | <0.001 |
Pb % | ≤0.0001 | <0.0001 |
Hg % | ≤0.0001 | <0.0001 |
Cd % | ≤0.0001 | <0.0001 |
As % | ≤0.0001 | <0.0001 |
Cr % | ≤0.0001 | <0.0001 |
Conclusion: qualified |