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1,Formula: Anhydrous CaHPO4 ; Dihydrate CaHPO4·2H2O
2,Formula wt: anhydrous 136.06
Formula wt: dihydrate 172.09
3,CAS: anhydrous [7757-93-9]; CAS: dihydrate [7789-77-7]
4, Einecs: 231-826-1
5,Specificity: white monoclinic crystalline powder, odorless, soluble in diluted hydrochloric acid, nitric acid, acetic acid, slightly soluble in water, insoluble in ethanol. relative density: 2.32.
Name of index |
|
FCC-V |
E 341 (ii) |
USP-30 |
Description |
|
White crystal or granular, granular powder or powder |
|
|
Assay |
% |
97.0-105.0 |
98.0--102.0(200℃, 3h) |
98.0-100.5 |
P2O5 Content(Anhydrous basis) |
% |
-- |
50.0--52.5 |
-- |
Identification |
|
Pass test |
Pass test |
Pass test |
Solubility tests |
|
-- |
Sparingly soluble in water. Insoluble in ethanol |
-- |
Fluoride, |
≤mg/kg |
50 |
50(expressed as fluorine) |
50 |
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) |
Carbonate |
|
-- |
-- |
Pass test |
Chloride |
≤% |
-- |
-- |
0.25 |
Sulphate |
≤% |
-- |
-- |
0.5 |
Arsenic |
≤mg/kg |
3 |
1 |
3 |
Barium |
|
-- |
-- |
Pass test |
Heavy metals |
≤mg/kg |
-- |
-- |
30 |
Acid-insoluble substance |
≤% |
-- |
-- |
0.2 |
Organic volatile impurities |
|
-- |
-- |
Pass test |
Lead |
≤mg/kg |
2 |
1 |
-- |
Cadmium |
≤mg/kg |
-- |
1 |
-- |
Mercury |
≤mg/kg |
-- |
1 |
-- |
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. |
-- |
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