Purity%>99.95
Arsenic content, as As, mg/kg NMT; 0.5
Lead content, as Pb, mg/kg NMT; 0.5
Cadmium content, as CD, mg/kg NMT; 0.1
Mercury content, as Hg, mg/kg NMT; 0.1
Germanium inorganic compound content, as GeO2, % 0.002
Total bacterial count (colony count), g1 NMT; 100
Coli group, g1 NMT; 30
Pathogenic bacteria Shall not be found
Residue after ignition at 105 degree for 2hrs, < 0.5%
Solubility in water at 60 degree, 20g/L, and the solubility will increase with rising of temperature.