Chemical SpecificationsAppearanceColorless hygroscopic crystals with faint odorAssayMin 99.0%Water (H2O)Max 1.0 %pH (10% solution in water; 20°C)6.5 to 7.5UV absorbance (10% in water)at 250 nmMax 0.05at 260 nmMax 0.04at 270 nmMax 0.03at 280 nmMax 0.02at 500 nmMax 0.02