... or colourless crystalsContent99.0-101.0%≥99.0%( anhydrous basis)Acidity and AlkalinityAccord with the test--Sulphate,≤%0.015--Heavy metals(As ... Pb), ≤%0.0010.0005Oxalate(As H2C2O4), ≤%0.030.01Easy carbonify substanceAccord with ... the test--Chloride, ≤%0.005--Loss on drying,11.0-13.0%≤13.5%pH value(5% aqueous ...