| ≥1 piece |
|
Name of indexes
|
GB1889-2004
|
FCC
|
USP
|
|
Appearance
|
White powder
|
White powder
|
White powder
|
|
Assay (as CaHPO4.2H2O),%
|
98.0-103.0
|
97.5-105.0
|
97.0-105.0
|
|
Fluoride, ≤%
|
0.005
|
0.005
|
0.005
|
|
Loss on ignition, %
|
24.5-26.5
|
24.5-26.5
|
24.5-26.5
|
|
Heavy metals(as Pb), ≤%
|
0.001
|
0.0015
|
0.0015
|
|
Pb, ≤%
|
0.0005
|
0.0002
|
0.0002
|
|
As, ≤%
|
0.0002
|
0.0003
|
0.0003
|
|
Insolubles in hydrochloric acid ≤%
|
0.05
|
-
|
0.02
|
|
Chloride ≤%
|
-
|
-
|
0.25
|