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Appearance     White powder
Identification Infrared absorption 197K     Concordant with reference spectrum
Identification A solution (1 in 20) responds to the tests for calcium     Conform to USP30
Specific optical rotation     +25.0°~+27.5°
Alkalinity     No pink color is produced within 5 seconds
Loss on drying     Not more than 5.0%
Heavy metals     Not more than 0.002%
Ordinary impurities     Not more than 1.0%
Organic volatile impurities     Meet the requirements
Nitrogen content     5.7%~6.0%
Content of calcium     8.2~8.6%
Assay     Conform  to USP30