二安替比林甲烷分光光度法测定功能纤维中TiO_2含量

Spectrophotometric determination of TiO_2 in functional fiber with DAPM

针对功能纤维中添加TiO2的含量测定问题,对功能纤维样品采用高温消化、混酸溶解的前处理方式,以抗坏血酸作Fe^3＋、Cu^2＋的掩蔽剂,二安替比林甲烷作为显色剂,用分光光度法在λ=390 nm波长处测定功能纤维中纳米TiO2的含量.钛的质量浓度在0.005～0.65 mg/L范围内标准液质量浓度与吸光度呈良好的线性关系,线性方程为y=1.407 1x-0.009 3（R^2=0.999）,检测限为0.005 mg/L,平均回收率98%以上,RSD=0.59%.该方法简便快速,准确度高,实用性强.

To determinate the concentration of TiO2 in functional fiber for labeling purpose, the sample was nitrified with burning and dissolved in mix acid as pretreatment and then its concentration of TiO2 was determined by spectrophotometric method with ascorbic acid as shelter reagent of Fe^3＋ and Cu^2＋ and diantipyryl methane （DAPM） as developer at wavelength λ = 390 nm. A good linear relationship was exhibited with the mass concentration of Ti at the range of 0. 005 - 0.65 mg/L, linear equation y = 1.407 1 x - 0. 009 3 （R^2 = 0.999）, the detection limit was 0.005 mg/L, the average recovery ratio was above 98%, and relative standard deviation （RSD） was 0.59%. The method is simple and fast, high accuracy and practicability.