同位素2024，Vol.37Issue(2)：146-152,7.DOI:10.7538/tws.2024.37.02.0146
偶氮胂Ⅲ快速比色法测定二氧化钍溶解液中的Th(Ⅳ)
Rapid Determination of Th(Ⅳ)in Thorium Dioxide Solution by Arsenazo Ⅲ
摘要
Abstract
ThO2 can produce many nuclides after accelerator bombardment,such as Actinium-225,Radium-223,Molybdenum-99,Iodine-131,Strontium-90,etc.There are many methods for measuring heavy elements such as thorium,but most of them are complicated to operate.Spectrophotometry has the advantages of simple sample preparation and low operation difficulty,and can be used as a quantitative analysis method for thorium and other heavy elements.ThO2 was dissolved with nitric acid and hydrogen fluoride,and the concentration of Th(Ⅳ)in ThO2 solution was quantitatively analyzed with Arsenazo Ⅲ as the chromogenic agent.Under the environment of 2 mol/L hydrochloric acid solution and 0.1 g/L Arsenazo Ⅲ solution,the coordination ratio of Arsenazo Ⅲ and Th(Ⅳ)is 5:2 under the experimental conditions.The maximum absorption wavelength before and after color development is 534.0 nm and 663.2 nm,respectively,and the contrast is 129.2 nm.The method in 0.2-5.0 mg/L is in accordance with Lambert-Beer's law,the standard curve equation y=0.06641x+0.00176,R2=0.99981.The molar absorption coefficient of 1.64×104.Method detection limit is 0.31 μg/L,and quantitative limit is 0.97 μg/L.The method is stable within 4 h.The recovery is 97.33％-104.03％,and the largest standard deviation is 0.32％.The method was compared with GB/T 12690.12-2003,the process was simplified and the results were basically consistent.关键词
偶氮胂Ⅲ/二氧化钍/定量分析Key words
arsenazo Ⅲ/thorium dioxide/quantitative analysis分类
能源科技引用本文复制引用
赵鹏飞,吴久伟,王宇,李勇,官国英..偶氮胂Ⅲ快速比色法测定二氧化钍溶解液中的Th(Ⅳ)[J].同位素,2024,37(2):146-152,7.基金项目
中国原子能科学研究院青年英才培育项目(YC222412001304) （YC222412001304）
