No. |
Items |
Specifications |
Results |
1 |
Appearance |
White crystalline powder |
|
2 |
Assay |
99.50% min. |
99.85% |
3 |
Melting point |
168.0 – 171 ℃ |
168.5 – 170.9 ℃ |
4 |
Solubility(40% aq.) |
Clear colorless solution |
Conforms |
5 |
Heavy Metals |
5ppm max |
Conforms |
6 |
Water |
0.2% max |
0.15% |
7 |
pH value(5% aq.) |
10.0-11.5 |
10.95 |
8 |
Iron ion (Fe3+) |
1 ppm max. |
Conforms |
9 |
Sulfate (SO42-) |
10 ppm max. |
Conforms |
10 |
Chloride(Cl-) |
3 ppm max. |
Conforms |
11 |
Ultraviolet absorbance 280 nm(40% aq.) |
0.07 max. |
0.069 |
12 |
Ultraviolet absorbance 400 nm(40% aq.) |
0.02 max. |
0.013 |
13 |
Infrared spectrum |
Conforms to reference |
Conforms |
|
Conclusion |
Qualified |