优等品

一等品

合格品

氮（N）的质量分数（以干基计）/%   ≥

 Mass fraction  

25.4

24.5

23.5

水分（H2O的质量分数a/%          ≤

Mass fraction

0.5

1.0

8.5

钠盐的质量分数（以Na计）b/%       ≤

Mass fraction

0.8

1.2

1.6

粒度c（2.00mm-4.75mm）/%          ≥

Granularity

90

80

—

颗粒平均抗压碎力c/N           ≥

Average crushing resistance of particles

10

10

—

砷及其化合物的质量分数（以As计）/%≤

The mass fraction of arsenic and its compounds

0.0050

镉及其化合物的质量分数（以Cd计）/%≤

Mass fraction of cadmium and its compounds

0.0010

铅及其化合物的质量分数（以Pb计）/%≤

Mass fraction of lead and its compounds

0.0200

铬及其化合物的质量分数（以Cr计）/%≤

The mass fraction of chromium and its compounds

0.0500

汞及其化合物的质量分数（以Hg计）/%≤

Mass fraction of mercury and its compounds

0.0005

a水的质量分数仅在生产企业检验和生产领域质量抽查检验时进行判定。

The quality fraction of water is only determined during the inspection of the production enterprise and the quality sampling inspection of the production field.

b钠盐的质量分数以干基计。

The mass fraction of sodium salt is measured on a dry basis.

c结晶状产品无粒度和颗粒平均抗压碎力要求。

Crystalline products have no requirements for particle size and average particle crushing force.