≥1 piece |
No. |
Index
|
Industrial grade
|
Food grade
|
1
|
H 3 PO 4 %≥
|
85.0
|
85.0
|
2
|
Chloride, as Cl %≤
|
0.0005
|
0.0005
|
3
|
Sulfate, as SO 4 %≤
|
0.005
|
0.005
|
4
|
Iron, as Fe %≤
|
0.002
|
0.002
|
6
|
Heavy metal, as Pb %≤
|
0.003
|
0.001
|
7
|
Arsenic, as As %≤
|
0.0005
|
0.0003
|
8
|
Fluoride, as F %≤
|
-
|
0.002
|
9
|
Whiteness %≤
|
30
|
20
|