|
RODUCT NAME: Ascorbic acid (Vitamin C) |
||
|
ITEMS |
STANDARD |
RESULTS |
|
Characteristics |
White or almost white crystalline powder |
Pass |
|
Identification |
Positive reaction |
Positive |
|
Melting point |
About 190°C |
191°C |
|
pH |
2.1 – 2.6 |
2.3 |
|
Clarity of solution |
Clear |
Clear |
|
Colour of solution |
≤ BY7 |
<BY7 |
|
Copper |
≤5ppm |
<5ppm |
|
Heavy metals(lead) |
≤10ppm |
<2ppm |
|
LEAD |
≤2ppm |
<2ppm |
|
iron |
≤2ppm |
<2ppm |
|
Arsenic |
≤3ppm |
<3ppm |
|
Oxalic acid |
≤0.2% |
<0.2% |
|
Sulphate ash (Residue on ignition) |
≤0.1% |
0.03% |
|
Specific optical rotation |
+20.5° ~ +21.5° |
+20.98° |
|
Assay |
99.0% - 100.5% |
99.6% |
|
Organic volatile impurities |
Pass |
Pass |
|
Residual solvents |
Methanol: NMT3000ppm |
<3000ppm |
|
Conclusion |
The above product conforms to BP2010/USP32 |
|
