Name of index

FCC-V

E339(i)

Description

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Odourless, colourless crystals or white granular or crystalline powder,hygroscopic

pH of a 1 % solution

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4.1—5.0

Content,

98.0—103%(as dry base)

60°C 1h then 105°C 4h, ≥97%

P₂O₅ Content(Anhydrous basis) ,%

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58.0-60.0

Lead, ≤%

0.0004

0.0004

Water insolubles(Anhydrous basis),≤%

0.2

0.2

Fluoride, ≤%

0.005

0.001

Loss on drying,

1,Anhydrous ≤2.0%

2,Monohydrate:10.0-15.0%;

3,Dihydrate: 20.0-25.0%

(105°C,4h)

1,Anhydrous ≤2.0%,

2,Monohydrate 1≤5.0%,

3,Dihydrate ≤25%

(60°C 1h then 105°C 4h)

As,≤%

0.0003

0.0003

Cadmium ≤%

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0.0001

Mercury ≤%

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0.0001