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１引言Ｆｒ■ｈｄｅ反应是药物的多种颜色反应之一，它依据反应前后的颜色变化进行一些药物的定性鉴定，许多药物具有这一反应。钼和钨是重要的工业原料，而钼又是决定生物生长的重要元素。在自然界中，钼和钨主要以Ｍｏ（Ⅵ）和Ｗ（Ⅵ）价态存在。作者研究发现，在弱酸性介质
1 Introduction Fr ■ hde reaction is one of the multi-color reactions of a drug, which qualitatively identifies some drugs based on the color change before and after reaction. Many drugs have this reaction. Molybdenum and tungsten are important industrial raw materials, and molybdenum is an important element that determines biological growth. In nature, molybdenum and tungsten are mainly present in the valence states of Mo (Ⅵ) and W (Ⅵ). The authors study found that in weakly acidic media