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系统研究邻硝基苯基荧光酮与钛的显色反应，试验多种表面活性剂对体系的作用及相应的光度性质，从而确定Ｔｉ（Ⅳ）－ＯＮＰＦ－Ｔｗｅｅｎ－４０为较佳体系，在０．０８４—０．１５ｍｏｌ／ＬＨＣｌ介质中形成紫红色配合物，其波长在５３０ｎｍ处的表观摩尔吸光系数ε为１．７９×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，配合物组成中Ｔｉ∶ＯＮＰＦ＝１∶４，钛浓度在０—１．２μｇ／１０ｍＬ范围内服从比耳定律。应用于直接测定硅铁合金中钛，结果满意。
The color reaction of o-nitrophenylfluorone with titanium was systematically studied. The effects of various surfactants on the system and corresponding photometric properties were studied. The results showed that Ti (Ⅳ) -ONPF-Tween-40 was the best system. 0.084-0.15mol / LHCl medium, the apparent molar absorptivity ε at wavelength 530nm was 1.79 × 105L · mol-1 · cm-1, and the composition of Ti: ONPF = 1: 4, and Titanium concentration obeys Beer’s Law within the range of 0-1.2 μg / 10 mL. Apply to the direct determination of titanium in ferrosilicon alloy, with satisfactory results.