Item Standard Inspection result Appearance White or slight yellowish crystal powder , Pass Loss on dry, % 1.0max 0.6% Content, 98% min 99.2% Reduzate , % 0.7 max 0.3 Chloride, % 0.07max 0.002 Sulphate, % 0.05max 0.003 Ph 6.2-7.8 6.7 Pb , g/g 2max 0.5 Heavy metal, g/g 10max 5 Arsenic salt, g/g 2max 1 Apearance of solution Clear Clear