Chemical SpecificationsAppearanceWhite crystalline powderAssay (as KNO3)99 - 100.5%Identity (acc. to pharmacopoeias)Passes testAppearance of solutionPasses testReducing substancePasses testpH (5% solution in water; 20°C)4.5 - 8.5Acidity or alkalinityPasses testChloride (Cl)Max 0.001%Chlorate and perchlorate (as Cl)Passes testSulphate (SO4)Max 0.003%Phosphate (PO4)Max 0.0005%Lead (Pb)Max 0.0005%Arsenic (As)Max 0.0003%Iron (Fe)Max 0.0003%Calcium (Ca)Max 0.001%Sodium (Na)Max 0.02%Ammonium (NH4)Max 0.001%Iodate (IO3)Max 0.0005%Nitrite (NO2)Max 0.0005%Loss on drying (at 105°C)Max 0.5%