| Name of index | GB25585-2010 | FCC-V | E 508 | ||
| Description | Colourless, elongated, prismatic or cubital crystals or white granular powder. Odourless | ||||
| Content( after drying ) | ≥% | 99.0 | ≥99.0 ≥98.0when contains added substance(s) | 99.0 | |
| Solubility | -- | -- | Freely soluble in water. Insoluble in ethanol | ||
| Identification | Pass test | Pass test | |||
| Acidity and Alkalinity | Pass test | Pass test | |||
| () | Heavy metals(as Pb) | ≤mg/kg | 5 | 5 | -- |
| Iodide and/or Bromide | Pass test | Pass test | |||
| Loss on drying, | ≤% | 1.0 | 1.0 | 1.0(105 °C, 2hours) | |
| Sodium | ≤0.5% | Pass test | Negative | ||
| Arsenic(As) | ≤ppm | 2 | -- | 3 | |
| Lead(Pb) | ≤ppm | -- | -- | 2 | |
| Mercury(Hg) | ≤ppm | -- | -- | 1 | |
| Cadmium(Cd) | -- | -- | 1 | ||