Item | Standard |
Assay | 99.0%-100.5% |
Melting point | about 190℃ |
PH value | 2.1-2.6 |
Clarity of solution | Clear |
Color of solution | BY7 Max. |
Copper | 5ppm Max. |
Heavy metals | 10ppm Max. |
Mercury | 1mg/kg Max. |
Lead | 2mg/kg Max. |
Arsenic | 3ppm Max. |
Iron | 2ppm Max. |