外观

Description

White crystal or granular, granular powder or powder

含量

Assay

%

97.0-105.0

98.0-102.0(200℃, 3h)

98.0-105.0

P2O5含量(无水物)

P2O5 Content(Anhydrous basis)

%

--

50.0--52.5

--

鉴别试验

Identification

Pass test

Pass test

Pass test

溶解测试

Solubility tests

--

Sparingly soluble in water. Insoluble in ethanol

--

氟化物

Fluoride,

≤mg/kg

50

50(expressed as fluorine)

50

灼烧失重

Loss on ignition, (After ignition at 800℃±25℃ for 30minutes)

%

7.0-8.5 (Anhydrous) 24.5-26.5 (Dihydrate)

≤8.5 (Anhydrous)

≤26.5 (Dihydrate)

6.6-8.5 (Anhydrous) 24.5-26.5 (Dihydrate)

碳酸盐

Carbonate

--

--

Pass test

氯

Chloride

≤%

--

--

0.25

硫酸盐

Sulphate

≤%

--

--

0.5

砷

Arsenic

≤mg/kg

3

1

3

钡

Barium

--

--

Pass test

重金属

Heavy metals

≤mg/kg

--

--

30

酸不溶物

Acid-insoluble substance

≤%

--

--

0.2

有机挥发杂质

Organic volatile impurities

--

--

Pass test

铅

Lead

≤mg/kg

2

1

--

镉

Cadmium

≤mg/kg

--

1

--

汞

Mercury

≤mg/kg

--

1

--

铝

Aluminium

Not more than 100 mg/kg for the anhydrous form and not more than 80 mg/kg for the dihydrated form (only if added to food for infants and young children) Not more than 600 mg/kg for the anhydrous form and not more than 500 mg/kg for the dihydrated form (for all uses except food for infants and young children). This applies until 31 March 2015. Not more than 200 mg/kg for the anhydrous form and the dihydrated form (for all uses except food for infants and young children). This applies from 1 April 2015.