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