Serial number

Index name

Food grade

1

Appearance

White powder

2

Main content（In terms of Na₂H₂P₂O₇）%≥

95

3

Phosphorus pentoxide（In terms of P₂O₅）%≥

63-64

4

Methyl orange alkalinity（In terms of Na₂O）%

36-40

5

PH value（1% Aqueous solution）

3.5-4.5

6

Heavy metal(In terms of Pb）%≤

0.001

7

Arsenic（As)%≤

0.0003

8

Fluoride（In terms of F mg/kg）%≤

0.005

9

Water-insoluble matter %≤

0.1