Name of indexes

GB1886.3-2021

FCC

USP

E 341 (ii)

Description

White crystal, crystal powder or particle

White powder

-

White crystals or granules，granular powder or powder

Assay (As CaHPO4)  %

98.0-105.0

97.0-105.0

98.0-103.0

98.0-102.0(after drying at 200 °C for 3 hours)

P2O5 content (on the anhydrous basis)  %

-

-

-

50.0-52.5

Identification A

-

white precipitate forms

-

Identification B

-

yellow precipitate of ammonium phosphomolybdate forms

-

Test for calcium

-

-

-

Passes test

Test for phosphate

-

-

-

Passes test

Solubility

-

-

-

Sparingly soluble in water. Insoluble in ethanol

Loss on Ignition %

7.0-8.5

7.0-8.5

6.6-8.5

≤8.5

Heavy metals(As Pb)  ≤

10mg/kg(on the dried basis)

-

0.003%

-

Fluorine  ≤

50.0mg/kg(on the dried basis)

0.005%

0.005%

50.0 mg/kg (expressed as fluorine)

Lead    ≤

2.0mg/kg(on the dried basis)

2.0 mg/kg

-

1.0 mg/kg

Arsenic  ≤

2.0mg/kg(on the dried basis)

3.0 mg/kg

3 ppm

1.0 mg/kg

Mercury  ≤

-

-

-

1.0 mg/kg

Cadmium  ≤

-

-

-

1.0 mg/kg

Aluminium  ≤ 

-

-

-

100 mg/kg(only if added to food for infants)

200 mg/kg(for all uses except food for infants and young children)

Acid-Insoluble Substances  ≤%

0.05(on the dried basis)

-

0.2

-

Chloride ≤%

-

-

0.25

-

Sulfate  ≤%

-

-

0.5

-

Carbonate

-

-

No effervescence occurs

-

Barium

-

-

No turbidity is produced within 10 min

-