| Testing Items | Specification |
| APPEARANCE | WHITE OR ALMOST WHITE,CRYSTAL OR CRYSTALLINE POWDER |
| IDENTIFICATION | POSITIVE |
| MELTING POINT | 191℃~192℃ |
| PH | 2.2~2.5 |
| CLARITY OF SOLUTION | CLEAR |
| HEAVY METALS | ≤0.0003% |
| ASSAY | 99.0%~100.5% |
| COPPER (ppm) | ≤3.0 |
| IRON (ppm) | ≤2.0 |
| MERCURY (ppm) | ≤1.0 |
| ARSENIC | ≤0.0002% |
| LEAD | ≤0.0002% |
| OXALIC ACID | ≤0.2% |
| LOSS ON DRYING | ≤0.1% |
| SULPHATED ASH | ≤0.1% |
| RESIDUAL SOLVENTS(as methanol ) (ppm) | ≤500 |
| TOTAL PLATE COUNT(cfu/g) | ≤1000 |
| YEASTS & MOLDS(cfu/g) | ≤100 |
| ESCHERICHIA.COLI | ABSENCE |
| SALMONELLA | ABSENCE |
| STAPHYLOCOCCUS AUREUS | ABSENCE |