维他命C

Certificate of Analysis Items Specification Results Characteristics White Crystalline PowderWhite Crystalline Powder IdentificationPositive reactionPositive reaction Melting point About 190degree celsius 191degree celsius PH 2.1-2.6 2.4 Clarity of solution Clear Clear Mercury ≤0.1ppm <0.1ppm Zinc≤25ppm <25ppm Arsenic ≤3ppm <3ppm Lead ≤2ppm <2ppm Loss on drying≤0.1%<0.05% Colour of solution ≤BY7<BY7 Copper ≤5ppm <5ppm Heavy metals ≤10ppm<10ppm Iron ≤2ppm <2ppm Oxalic acid ≤0.2 % <0.2 % Sulphate ash≤0.1% 0.03% Specific optical rotation +20.5°- +21.5° +21.0.° Organic volatile impurities Pass Pass