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 QC Department / Specification of analysis / DCP propertise
 Name : Calcium Phosphate Dihydrate , Calcium Hydrogen Phosphate                                 
Chemical Formula : CaHPO4, 2H2O
 Molar mass: 172.09
 CAS Number: [7789-77-7]
 Test Acceptable limits of ISIRI*          
 Acceptable limits of Aras Taban
 Characters A white to grey  granular and powder
 A white to grey  granular and powder
 Loss on drying  Not more than 3.0%  Less 2.5%
 pH 1% (In House)  4.0  to 7.0  5.0  to  6.0

Heavy metals as: Pb

                            Cd

                            As

                            Hg

Not more than 45 ppm

Not more than 20 ppm

Not more than 15 ppm

 Not more than 0.1 ppm

Not more than 45 ppm

Not more than 15 ppm

Not more than 5 ppm

 Not more than 0.05 ppm
 Limit of acid-insoluble substances  Not more than 1.5%  Not more than 1.5%
 Soluble  phosphor in citric acid  Min 85.0% of total phosphor  Min 90% of total phosphor
 Soluble  phosphor in alkaline of ammonium citrate  Min 85.0% of total phosphor  Min 90% of total phosphor
 Limit of  Fluoride  Not more than 1800 ppm  Not more than 1400 ppm
 Non Protein Nitrojen (NPN) Absent  Absent

Assay as: P

                Ca

Not less than 17.0%

21.0%  to  25.0%

Not less than 17.5%

23.0%  to  25.0%
 ISIRI* :Institute of standards and industrial research of Iran