| ITEMS | Specification |
| CHARACTERS | WHITE,CRYSTALLINE POWDER |
| IDENTIFICATION | COMPLIES WITH THE TEST |
| ASSAY | 99.0%~100.5% |
| LOSS ON DRYING | 3.0%~6.0% |
| READILY CARBONISABLE SUBSTANCES | PASS THE TEST |
| PH(IN 5% SOLUTION) | 7.6-9.0 |
| CHLORIDE | =<50PPM |
| OXALATE | =<300PPM |
| TARTRATE | Pass the test |
| SULPHATE | =<150PPM |
| HEAVY METALS | =<10PPM |
| ARSENIC | =<4PPM |