钛(Ⅳ)-邻硝基苯基荧光酮-平平加-十二烷基硫酸钠体系测定钛的研究和应用

Spectrophotometric Determination of Titanium by Titanium (Ⅳ)-2,6,7-Trihydroxy-9-(ο-nitrophenyl) fluorone-Peregal ο-Sodium Lauryl Sulphate System

本文研究了在非-阴混合型表面活性剂(平平加-SDS)存在下,钛(Ⅳ)和O-NPF的显色反应,结果表明,在0.015～0.065mol/L H_2SO_4介质中络合物非常稳定,随O-NPF浓度不同络合物组成分别为1∶2和1∶4,后者的λ_(max)=542nm,ε=2.02×10~5L·mol^(-1)·cm^(-1),钛量在0～6μg/25ml范围内服从比尔定律。方法的灵敏度高,选择性好,用于合金钢样和有机钛中钛的直接测定,结果满意。

The colour reactions of quaternary complex fromed by titanium and 2,6,7-trihydroxy-9-(o-nitrophenyl)fluorone (o-NPF) in the presence of nonionic and anionic mixed surfactants (Peregal O-SDS) were investigated. Ti(Ⅳ) reacts with o-NPF to from a red orange complex in the medium of 0.015～0.065mol/L H_2SO_4, the apparent molar absorptivity is 2.02×10~5L·mol^(-1)·cm^(-1) at 542nm, and the composition of Ti(Ⅳ): o-NPF complex is 1:4.Beer's law is obeyed in the range of 0～6μg/25ml for titanium, and the complex is stable for 24 hours. The method has been applied to the direct determination of trace titanium in steel alloys and organotitanium compounds with satisfactory results. The recovery is 98.7%～100.5%.