偕胺肟基功能高分子膜吸附铀量的测定

以偶氮氯膦Ⅲ(CPAⅢ)作为显色剂,研究可见光分光光度计测定含偕胺肟基功能高分子膜螯合电极对铀酰离子的吸附量的实验方法。确定了分光光度法测定的铀酰离子吸附量的实验条件:吸收光波长670 nm,CPAⅢ标准溶液(0.001 mol.L-1)的用量3mL,测定体系的最佳pH值1.0,室温下显色时间2 min。在此实验条件下,绘制了铀的工作曲线,并得到摩尔吸光系数为ε=29 750 mol-1.L.cm-1。对比电子能谱法所测定的脱附铀前后的螯合电极表面的铀含量(脱附前后亮区铀含量分别为38.12%和6.29%,暗区铀含量都为零),得到分光光度计法测定的铀含量并不是螯合电板表面的真实铀含量,但却是脱附下来的铀的真实量,这肯定了分光光度法测定铀的吸附量优势所在。

Mensuration of Adsorption of Uranium on Amidoxime-group Functional Polymeric Film

The experimental method of measuring the amount of uranium absorbed on the chelating electrodes by using CPAⅢ as the chromogenic agent was investigated.The results showed that the experiment condition was the wavelength 670 nm,the dosage of CPAⅢ 3 mL,the pH value 1.0,and the coloration time 2 min in the room temperature.The working curve of uranium was obtained with the molar absorptivity 29 750 mol-1·L·cm-1 under thus experiment conditions.By comparing the uranium concentration before and after desorbing uranium measured by Energy Dispersive Spectrometer(EDS)(38.12% and 6.29% before and after desorbing for light region,respectively,zero for both darkspaces),the result showed that the uranium concentration on chelating electrodes measured by spectrophotometer,but it was the true desorption down the amount of uranium.Further more,the method of spectrophotometer on mensuration of the amount of uranium was conformed.