Project

class I

class II

high-class product（14-65-0）

（class II） （18-58-0）

Conforming product（16-60-0）

Mass fraction of total nutrient (N+available P2O5) %≥

79

76

76

Total nitrogen content %≥

13

15

17

Mass fraction of available P2O5 %≥

64

59

57

polymerization exponent %≥

98

98

70

average degree of polymerization

8~20

8~20

2~8

Mass fraction of water insoluble substance %≤

0.1

0.1

0.1

pH value(4g / l aqueous solution)

6~8

6~8

6~8

Mass fraction of moisture %≤

0.5

0.5

0.5

Mass fraction of As %≤

0.001

0.001

0.003

Mass fraction of Pb %≤

0.001

0.001

0.001

Mass fraction of Cd %≤

0.0005

0.0005

0.0005

Mass fraction of Cr %≤

0.005

0.005

0.005

Mass fraction of Hg %≤

0.0003

0.0003

0.0003