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地址：武汉市江岸区后湖大道汉口城市广场C区3号楼1013
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| ITEMS | Specifications |
| Appearance | White crystals or crystalline powder |
| Assay. % | 98.5~101.5 |
| Identification | Positive |
| Transmittance, % | >=98 |
| pH | 5.5~6.5 |
| Heavy metal(as Pb),ppm | =<20 |
| Loss on drying, % | =<0.20 |
| Residue on ignition, % | =<0.1 |
| Chioride(as Cl), % | =<0.007 |
| Sulphate(as SO4), % | =<0.0065 |
| Iron(as Fe), % | =<10 |
| Pb ppm | =<1 |
| Ammonium(as NH4), % | =<0.01 |
| Arsenic(as As) ppm | =<1 |
