Product name
Sodium thiosulfate anhydrous
Specification
Reagent grade
Molecular formula
Na2S2O3
CAS
7772-98-7
H.S. CODE
2832300000
Molecular weight
158.09
Appearance
White powder
Package
25KG Woven bags or fiber drums
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Property:
Colorless crystalline or translucence powder. The relative density 1.769. Hot to 100 ℃ began to decompose into ammonia and acid hydrogen amines. Soluble in water, insoluble in ethanol and acetone.
Application:
Analytics reagents. As the support point electrochemical analysis and solution quality. Also used in the microbiological media, ammonium salt preparation.
Test standard:Enterprise Standard
Test items |
Specification |
|
AR grade |
CP grade |
|
Appearance |
White powder |
White powder |
Assay |
≥99.0% |
≥97.0% |
pH |
5.0-8.0 |
5.0-8.0 |
Appearance of solution |
Conform |
Conform |
Water insoluble |
≤0.01% |
≤0.015% |
Residues on ignition |
≤0.01% |
≤0.3% |
Sulfate and sulfite |
≤0.3% |
≤0.8% |
Sulfide |
≤0.0005% |
≤0.001% |
Calcium |
≤0.005% |
- |
Heavy metals |
- |
≤0.003% |
Storage:
Store in a cool, dry and well ventilated place. Keep away from incompatible substances. Keep container closed.