CAS No.: | 50-81-7 |
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Packaging Material: | Paper |
Storage Method: | Normal |
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Analysis Items | Specifications |
Charactertist ics | White or almost white crystalline powder or colorless crystals |
Identification | IR: Complies CA: Positive |
Melting point | About 190ºC |
Specific roation | +20.5°-+21.5° |
Acidity(pH) | 2.1-2.6(5% aqueous solution) 2.4-2.8(2% aqueous solution) |
Assay | 99.0%-100.5% |
Loss on drying | ≤0.40% |
Impurity E (Oxalic acid) | ≤0.2% |
Related substances | Impurity C:≤0.15% Impurity D:≤0.15% Unspecified Impurities:≤0.10% Total Impurities other than C,D: ≤0.2% |
Heavy metals | ≤10ppm |
Arsenic | ≤3ppm |
Lead | ≤2ppm |
Mercury | ≤1ppm |
Copper | ≤5ppm |
Iron | ≤2ppm |
Sulphated ash | ≤0.1% |
Clarity of solution | Clear |
Colour of solution | ≤BY7 |
Residual solvents | Menthanol≤0.3% |
Particle-size | ≤30% more than 40 mesh >=45% between 40 and 80 mesh |