Name of index

GB1886.336-2021

FCC-V

USP

E 339 (i)

Description

White crystals, crystal powder or granules

Anhydrous:White,crystalline powder or granules

Hydrated:White or transparent crystals or granules

-

white odourless, slightly deliquescent powder, crystals or granules

Assay(NaH2PO4) %

98.0-103.0（on the dried basis）

98.0-103.0

98.0-103.0(on the anhydrous basis)

≥97(After drying 60 °C 1 hour，then 105 °C 4 hours)

P2O5(on the anhydrous basis) ,%

-

-

-

58.0-60.0

Test for sodium

-

Passes test

Passes test

Passes test

Test for phosphate

-

Passes test

Passes test

Passes test

Solubility

-

Freely soluble in water. Insoluble in alcohol

-

Freely soluble in water. Insoluble in ethanol or ether

Water Insoluble  ≤%

0.2(on the dried basis)

0. 2

0.2

0.2(on the anhydrous basis)

Arsenic    ≤

3.0mg/kg(on the dried basis)

3 mg/kg

8ppm

1 mg/kg

Heavy metals(As Pb) ≤ 

10mg/kg(on the dried basis)

-

0.002%

-

Lead     ≤

4.0mg/kg(on the dried basis)

4 mg/kg

-

1 mg/kg

Fluorine   ≤

30.0mg/kg(on the dried basis)

0.005%

-

10 mg/kg (expressed as fluorine)

Cadmium    ≤%

-

-

-

1 mg/kg

Mercury     ≤%

-

-

-

1 mg/kg

Sulfate  ≤%

-

-

0.15

PH (1% aqueous solution)

4.1-4.7

-

4.1-4.5((5% g/ml))

4.1-5.0

Loss on Drying NaH2PO4 ≤%

2.0

2.0

-

2.0

Loss on Drying NaH2PO4·H2O %

10.0-15.0

10.0-15.0

-

≤15.0

Loss on Drying NaH2PO4·2H2O %

20.0-25.0

20.0-25.0

-

≤25(60 °C, 1 hour then 105 °C, 4 hours)

Water  NaH2PO4 ≤%

-

-

2.0

-

Water NaH2PO4·H2O %

-

-

10.0-15.0

-

Water NaH2PO4·2H2O %

-

-

18.0-26.5

-