Items

Requirements

Results

Description 

White or off-white crystalline powder

Conformity 

Identification

   A250 / A260 = 0.79~0.89

A280 / A260 = 0.17~0.27

Have the maximum absorption at the wavelength of 257±1nm.

A250 / A260 = 0.83

      A280 / A260 = 0.20

257.3nm

pH

1.8~3.2

          2.5

Heavy metal

≤10ppm

Conforms

Arsenic

≤1.5ppm

      Conforms

Purity(HPLC)

≥98.0%

    99.8%

Loss on drying

≤6.0%

    4.3%

Transparency

≥95.0%

    99.3%

Assay(UV)

≥98.0%

98.4%