CAS No.77-92-9
The detailed specifications are as below:
| Items | Standard |
| Appearance | Colorless or white crystalline particles or powder; odorless, extremely sour taste |
| Identification | conform |
| Citric acid content(C6H8O7)ω/% | 99.5~100.5 |
| Water ω/% | ≤0.5 |
| Easy carbide | ≤1.0 |
| Sulphate ash ω/% | ≤0.05 |
| Sulfate ω/% | ≤0.010 |
| Chloride ω/% | ≤0.005 |
| Oxalate ω/% | ≤0.01 |
| Calcium salt ω/% | ≤0.02 |
| Pb mg/kg | ≤0.5 |
| Total As mg/kg | ≤1.0 |