Name of index

FCC-V

E450(iii)

Description

Colorless or white crystals, or a   white crystalline or granular powder

pH of a 1 % solution

--

9.8-10.8

Assay (ignited basis)

95-100.5%

≥95%(ignited basis)

P₂O₅   Content ,%

--

52.5-54

Lead, ≤%

0.0004

0.0004

Water insoluble ,≤%

0.2

0.2

Fluoride, ≤%

0.005

0.001

Loss on   Ignition

1,Anhydrous:≤0.5%;

2,Decahydrate 38-42%

1,Anhydrous ≤0.5%

2,Decahydrate 38% -42%

105°C,4h then 550°C30m)

As,≤%

0.0003

0.0003

Cadmium ≤%

--

0.0001

Mercury ≤%

--

0.0001