Index name

Industrial Grade

Agricultural Grade

Superior

First-rate

Qualified

Superior

First-rate

Qualified

Color

White color

White or light color

Total nitrogen (N) content (dry basis),% ≥

46.5

46.3

46.3

46.4

46.2

46.0

Biuret content,% ≤

0.5

0.9

1.0

0.9

1.0

1.5

Content of water (H2O),% ≤

0.3

0.5

0.7

0.4

0.5

1.0

Iron content (Fe),% ≤

0.0005

0.0005

0.0010

-

-

-

The alkalinity (NH3 meter),% ≤

0.01

0.02

0.03

-

-

-