USP方法 weigh accurately a portion of sodium sulfate, equivalent to about 400mg of anhydrous sodium sulfate, dissolve in 200 ml of water, and add 1 ml of hydrochloric acid. heat to boiling, and gradually add, in small portions and while constantly stirring, and excess of hot barium chloride TS( about 8 ml).heat the mixture on a steam bath for 1 hour, collect the precipitate of barium sulfate on a tared filtering crucible, wash until free from chloride, dry, ignite, and weigh. the weight of the barium sulfate so obtained, multiplied by 0.6068, represents its equivalent of Na2SO4
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