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本文用荧光熄灭法研究了二溴羟基苯基荧光酮（ＤＢＨ—ＰＦ）为指示剂测定Ｔｉ（Ⅳ）．在吐温—８０存在下Ｔｉ（Ⅳ）与ＤＢＨ—ＰＦ形成１∶２紫红色配合物，λｅｘ１＝４７０ｎｍ，λｅｘ２＝５０２ｎｍ，λｅｍ＝５２２ｎｍ，检测限为４μｇ／Ｌ线性范围为４～５６μｇ／Ｌ。该方法灵敏度高，选择性好，适用于检测合金钢及铝合金中的微量钛。
In this paper, dibromohydroxyphenylfluorone (DBH-PF) was used as an indicator to determine Ti (Ⅳ) by fluorescence quenching. In the presence of Tween-80, the complex of Ti (Ⅳ) with DBH-PF formed a 1: 2 purple complex with λex1 = 470nm, λex2 = 502nm and λem = 522nm. The detection limit was 4μg / L. . The method has high sensitivity and good selectivity and is suitable for detecting trace titanium in alloy steel and aluminum alloy.