ascorbic acid

Analysis Contents

Analysis Standard

Analysis Results

Characteristics 

White or almost white crystals crystalline powder

Pass

Identification

Positive reaction

Positive

Melting point 

About 190°C

190.2°C

PH

2.4-2.8

2.41

Clarity of solution 

Clear

Clear

Colour of solution

≤BY7

≤BY7

Copper 

≤5ppm

≤5ppm

Heavy metals 

≤10ppm

≤10ppm

Mercury

≤0.1mg/kg

≤0.1mg/kg

Zinc

≤0.25ppm

≤0.25ppm

Lead

≤2mg/kg

≤2mg/kg

Arsenic

≤3ppm

≤3ppm

Cadmium(Cd)

≤1mg/kg

≤1mg/kg

Oxalic acid 

≤0.2% 

0.2%

Iron

≤2ppm

≤2ppm

Loss of Drying

≤0.4% 

≤0.4%

Residue On lgnition

≤0.1% 

≤0.1%

Specific rotation  

+20.5°- +21.5°

+21.10°

Mesh

40-80 Mesh

Pass

Origanic voltaic impurities

Pass

Pass

Free of metal perticles

Containing or not containing

Not containing

Assay

99.0%-100.5%

99.97%

Conclusion :

The above-mentioned product conforms to BP2008/USP31