Vitamin C DC 97%/Coated ascorbic acid DC97/cas 50-81-7

Items

Specification

Appearance

White or almost White crystals Crystalline Powder

Identification

Positive Reaction

Melting Point^,oC

About 190

Clarity Of Solution

Clear

Colour of Solution

≤BY7

PH

2.1~2.6

Copper,ppm

≤5

Heavy Metals,ppm

≤10

Mercury,mg/kg

<0.1

Lead,mg/kg

<2

Arsenic,ppm

≤3

Cadmium(CD),mg/kg

<1

Oxalic Acid,%

≤0.2

Iron,ppm

≤2

Loss of drying,%

≤0.4

Sulphate Ash(Residue On Ignition),%

≤0.1

Specific Optical Rotation

+20.5°~+21.5°

Organic Volatile Impurities

Pass

Assay,%

99.0 ~100.5