ascorbic acid vitamin c

Item

Standard(EP/BP/USP/FCC)

Test Result

Description

A White or Almost White Powder or Colorless Crystals

White Crystal Powder

Identification

Positive

Positive

Clarity And Color Of Solution

Clear;≤ BY₇

Clear;< BY₇

Residue on Ignition

≤0.1%

<0.02%

Heavy Metals

≤0.001%

<0.0003%

Copper

≤0.0005%

<0.0005%

Iron

≤0.0002%

<0.0002%

Sulphated Ash

≤0.1%

0.03%

Oxalic Acid

≤0.3%

<0.3%

Melting Point

About 190oC

191.5^oC

Specific Optical Rotation

+20.5^o  ~+21.5^o

+21.13^o

Acidity

PH=2.1~2.6

PH=2.35

Lead

≤0.2%

<0.2%

Arsenic 

≤0.0003%

<0.0003%

Assay

≥99.0%

99.90%

Item

Standard(GB/T7303-2006)

Test Result

Characteristic

White or Almost White Crystalline powder

Pass

Identification

Positive reaction

Positive

Heavy Metals

≤10ppm

<10ppm

Sulphated Ash(Residue on ignition)

≤0.1%

0.03%

PH

2.1~2.6

2.4

Melting Point

189~192^oC

191^oC

Specific Optical Rotation

+20.5^o  ~+21.5^o

+20.9^o

Arsenic 

≤3ppm

<3ppm

Assay

99.0%~101.0%

99.6%