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紫外光照射碘化钾水溶液，产生游离碘。利用碘与Ｖｃ的反应，测定了强力银翘片中Ｖｃ的含量，结果令人满意。
UV irradiation of potassium iodide solution, resulting in free iodine. Using the reaction of iodine and Vc, the content of Vc in Qiangli Yinqiao tablets was determined and the results were satisfactory.