No.

Item

Food grade

1

Main content %≥

98

2

Phosphorus pentoxide (as P₂O₅)%≥

39.5

3

Methyl orange alkalinity (as Na₂O)%

36-40

4

PH(1%Aqueous solution)

9-9.4

5

Heavy metal (as Pb)%≤

0.001

6

Arsenic (As)%≤

0.0003

7

Fluoride (as F mg/kg)%≤

0.005

8

Water insolubles %≤

0.1