VC

Testing Item

Standard

Result

Assay

99.0% -100.5%

99.72 percent

Appearance

White or almost White

Crystals Crystalline Powder

Conforms

Solubity

Easily Soluble in Water

Conforms

Identification

Positive Reaction

Positive

Melting Point

About 190°C

190.6°C

Copper

≤5 mg/kg

<5 mg/kg

Heavy Metals

≤10 mg/kg

<10 mg/kg

Mercury

≤0.1 mg/kg

<0.1 mg/kg

Lead

≤2 mg/kg

<2 mg/kg

Arsenic

≤3 mg/kg

<3 mg/kg

Oxalic Acid

≤ 0.2%

<0.2%

Iron

≤2 mg/kg

<2 mg/kg

Cadmium(Cd)

<1 mg/kg

<1 mg/kg

Impurity E

≤ 0.2%

<0.2%

Loss on Drying

≤ 0.4%

<0.4%

Sulphate Ash(residue on ignition)

≤ 0.1%

<0.1%

Specific Optical Rotation

+20.5°C~ +21.5°C

21.08°C

Testing Item

Standard

Result

Content (as Ascorbic acid) (%)

>35%

36.4 percent

Appearance

White to Slightly Yellow Powder

Conforms

PH Value

6.0~9.5

8.1

Identification

Positive Reaction

Positive

Lead

≤2 mg/kg

<2 mg/kg

Arsenic

≤3 mg/kg

<3 mg/kg

Particle Size (%)

Not less than 95% through 40 Mesh

99%