Name of indexes | FCC-V | USP-32 | E 341 (ii) |
Appearance | White powder | White powder | White granular powder or powder |
Assay (As CaHPO4), % | 97.0-105.0 | 98.0-103.0 | 98.0-102.0(200ºC, 3hours) |
P2O5(on the anhydrous basis), % | - | - | 50.0-52.5 |
Identification | - | - | Positive tests for calcium and for phosphate |
Fluoride, ≤% | 0.005 | 0.005 | 0.005 |
Loss on drying, ≤% | 7.0-8.5 | 6.6-8.5 | - |
Loss on ignition , ≤% | - | - | 8.5( 800 °C ± 25 °C , 30 minutes) |
Heavy metals(As Pb), ≤% | - | 0.003 | - |
Pb, ≤% | 0.0002 | - | 0.0001 |
As, ≤% | 0.0003 | 0.0003 | 0.0001 |
Mercury , ≤% | - | - | 0.0001 |
Cadmium, ≤% | - | - | 0.0001 |
Aluminium,≤ mg/kg | - | - | 200 |
Insoluble in HCI, ≤% | - | 0.2 | - |
Chloride, ≤% | - | 0.25 | - |
Sulphate (SO4), ≤% | - | 0.5 | - |
Carbonate | - | Test passed | - |
Barium | - | Test passed | - |