Items

Standards

Results

Appearance

White powder

White powder

Odor

Mild characteristic odor

Odorless

Nitrogen Content

35.00-35.5

35.07

 [α]_D^20。

（-0.10°—+0.10°）

  PASS

Loss on drying %

0.1max

<0.04

Ignition residue

0.1max

<0.06

Melting point：

220-240

225

Heavy metal (in Pb plan)

<10ppm

<0.001

PH value

4.5-6.5

5.55

Ash content;

0.1max

0.04

Assay

98.5%-101%

99.26%