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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.