外观

Description

Granular powder or white,deliquescent crystals or granules

鉴别试验

Identification

Pass test

Pass test

含量

Assay

%

As Ca
15.9-17.7 (Monohydrate)
16.8-18.3 (Anhydrous)

≥95%(On the dried basis)

P₂O₅(干基计)

P₂O₅（anhydrous basis）

%

-

55.5-61.1

氧化钙

CaO（105℃，4hours）

-

23.0-27.5%(Anhydrous)
19.0-24.8%(Monohydrate)

砷

As

≤mg/kg

3

1

氟

F

≤mg/kg

50

30(expressed as fluorine)

铅

Lead

≤mg/kg

2

1

镉

Cadmium

≤mg/kg

-

1

汞

Mercury

≤mg/kg

-

1

铝

Aluminium

-

Not more than 70 mg/kg(only if added to food for infants and young children)
Not more than 200 mg/kg (for all usesexcept food for infants and youg children)

干燥失重

Loss on drying

≤1%(Monohydrate)

Anhydrous:not more than 14%(105℃，4hours）
Monohydrate:not more than 17.5%(105℃，4hours）

灼烧失重

Loss on ignition

14.0-15.5(Anhydrous)

Anhydrous:not more than 17.5%（afterignition at 800℃±25℃for 30minutes）
Monohydrate:not more than 25.0%（determined by dryin at105℃ for one hour，then ignite at 800℃±25℃ for 30 minutes）