5′-硝基水杨基荧光酮分光光度法测定水泥中微量钛

Determination of Trace Titanium in Cement by Spectrophotometry with 5′-Nitro Salicylfluorone

研究了用5′-硝基水杨基荧光酮(NSAF)分光光度法测定水泥中微量Ti()。在硫酸介质中,表面活性剂CTMAB作用下,5′-硝基水杨基荧光酮与钛发生灵敏的显色反应,生成红色配合物,最大吸收波长为546nm,表观摩尔吸光系数为1.93×105L.mol-1.cm-1,Ti()含量在0.4—2.4μg/25mL范围内符合比耳定律,线性回归方程为A=0.03158+0.1455C(μg/25mL)。对于溶液中的一些共存离子,在抗坏血酸的掩蔽下均不干扰测定。方法简便,灵敏,可以不需分离,直接测定水泥中微量钛的含量,结果令人满意。

The new method for the determination of trace titanium in cement was established by spectrophotometry with 5′-nitro salicylfluorone（NSAF）.The sensitive color reaction between 5′-nitro salicylfluorone and titanium occurred effect in sulfuric acid medium and the presence of surface active agent CTMAB,then the red coordination compound was formed with the maximum absorption wavelength of 546 nm and the apparent molar absorptivity of 1.93×105L·mol-1·cm-1.Titanium（Ⅳ） obeyed Beer＇s law in range of 0.4—2.4μg/25mL,and the linear regression equation was A=0.03158＋0.1455C（μg/25mL）.A large number coexistence of ions in solution did not interfere with the determination under the cover of ascorbic acid.The method is simple,sensitive and without separation,that is applied to the direct determination of the content of trace titanium content in cement with satisfactory results.