Complaint
| Name of index | GB14889-94 | BP2009 | USP32 | FCC-V |
| Appearance | White or light yellow crystal or powder | White or light yellow crystal or powder | White or light yellow crystal or powder | White or light yellow crystal or powder |
| Content(K3C6H5O7) ≥% | 99.0 | 99.0-101.0 | 99.0-100.5 | 99.0-100.5 |
| Heavy metal(AsPb) ≤% | 0.001 | 0.001 | 0.001 | - |
| AS ≤% | 0.0003 | 0.0001 | 0.0001 | |
| Loss on drying % | 3.0-6.0 | - | 3.0-6.0 | 3.0-6.0 |
| Lead | - | - | - | |
| Moisture% | - | 4.0-7.0 | - | |
| Cl ≤% | - | 0.005 | - | |
| Sulphate Salt≤% | - | 0.015 | - | |
| Qxalates ≤% | - | 0.03 | - | |
| Sodium ≤% | - | 0.3 | - | |
| Alkalinity | Pass test> | Pass test | Pass test | Pass test |
| Readily Carbonisable Substances | - | Pass test | - | - |
| Transparenly and color of sample | - | Pass test | - | - |
| Pyrogens | - | - | - | - |
