Item

Standard

Analysis data

Appearance

White crystals or crystalline powder

conforms

Specific rotation

+13.5°~  +15.5°

+14.6°

Heavy metal (Pb)

≤10ppm

<10ppm

Arsenic（As）

≤1ppm

<1ppm

Loss on drying

≤ 0.20%

0.18%

Residue on ignition

≤ 0.20%

0.11%

assay

98.5%~101.0%

99.0%

pH

5.7-6.7

6.1

conclusion

 The product is accordance with standard.