外观

Description

Colourless or white granular powder, crystals or masses; deliquescent substance, hygroscopic

溶解性

Solubility

--

Freely soluble in water. Insoluble in ethanol

--

鉴别试验

Identification

Pass test

Pass test

Pass test

pH值

pH value

--

8.7-9.4(1% solution)

8.5-9.6(5% solution)

含量（以干基计）

Content(as dry base)

%

≥98.0

≥98.0(105℃,4h)

98-100.5

P2O5含量(无水物)

P2O5 Content(Anhydrous basis)

%

--

40.3-41.5

--

水不溶物（无水物）

Water insoluble(Anhydrous basis)

≤%

0.2

0.2

0.2

碳酸盐

Carbonate

--

--

Pass test

氯

Chloride

≤%

--

--

0.03

硫酸盐

Sulfate

≤%

--

--

0.1

有机挥发杂质

Organic volatile impurities

--

--

Pass test

氟

Fluoride

≤ppm

10

10(expressed as fluorine)

10

一钾盐或三钾盐

Monobasic or tribasic salt

--

--

Pass test

干燥失重

Loss on drying

≤%

2

2(105℃,4h)

1 (105℃)

重金属

Heavy metals

≤ppm

--

--

10

钠试验

Sodium

--

--

Pass test

砷

As

≤ppm

3

1

3

铁

Iron

≤ppm

--

--

30

镉

Cadmium

≤ppm

--

1

--

汞

Mercury

≤ppm

--

1

--

铅

Lead

≤ppm

2

1

--