|
Appearance
|
Dark red crystalline powder.
|
|
Assay
|
96 - 100.5%
|
|
Relative absorption
|
|
|
at 361 nm/278 nm
|
1.70 - 1.90
|
|
at 361 nm/550 nm
|
3.15 - 3.40
|
|
Arsenic (As)
|
Max 0.0003%
|
|
Copper (Cu)
|
Max 0.0025%
|
|
Lead (Pb)
|
Max 0.001%
|
|
Zinc (Zn)
|
Max 0.0025%
|
|
Related Substances
|
Max 3.0%
|
|
Methanol (GC,area %)
|
Max 0.3%
|
|
Loss on drying
|
Max 12%
|