1. Purity: above 99% pure 2. Optical rotation index: 3. Water content: less than 0.3% 4. Chlorides: less than 0.02% (as Cl) 5. Heavy metal: less than 10 ppm (mainly as Pb) 6. Arsenic: less than 1 ppm (as As2O3) 7. Sulphates : less than 0.03% (as SO4)
