|
Product name |
Sodium thiosulfate, pentahydrate |
|
Specification |
Reagent grade |
|
Molecular formula |
Na2S2O3·5H2O |
|
CAS |
10102-17-7 |
|
H.S. CODE |
2832300000 |
|
Molecular weight |
248.18 |
|
Appearance |
Colorless crystal |
|
Package |
25KG Woven bags or fiber drums |
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：GB/T 637—2006
|
Test items |
Specification |
|
|
AR grade |
CP grade |
|
|
Appearance |
Colorless crystal |
Colorless crystal |
|
Assay |
≥99.0% |
≥98.5% |
|
pH |
6.0~7.5 |
6.0~7.5 |
|
Appearance of solution |
Conform |
Conform |
|
Water insoluble |
≤0.005% |
≤0.01% |
|
Chloride |
≤0.02% |
- |
|
Sulfate and sulfite |
≤0.05% |
≤0.1% |
|
Sulfide |
≤0.00025% |
≤0.0005% |
|
Total nitrogen |
≤0.005% |
- |
|
Magnesium |
≤0.001% |
- |
|
Calcium |
≤0.003% |
≤0.005% |
|
Iron |
≤0.0005% |
≤0.001% |
|
Heavy metals |
≤0.0005% |
≤0.001% |
Storage：
Store in a cool, dry and well ventilated place. Keep away from incompatible substances. Keep container closed.
