(1) Solutions of sulfates yield with barium chloride TS a white precipitate, which does not dissolve upon addition of dilute nitric acid.〔【出典】第十六改正日本薬局方(平成23年3月24日 厚生労働省告示第65号)〕
After cooling, dissolve the residue in diluted hydrochloric acid (1 in 5), and filter if necessary. The filtrate yields a white precipitate upon addition of barium chloride TS.〔【出典】第十六改正日本薬局方(平成23年3月24日 厚生労働省告示第65号)〕