四价锝的制备与性质  

THE PREPARATION AND PROPERTY OF TETRAVALENT TECHNETIUM

作　　者：贾永芬[1] 朱志瑄[1] 张丕禄[1] 

机构地区：[1]中国原子能科学研究院放射化学研究所

出　　处：《原子能科学技术》1999年第3期223-227,共5页Atomic Energy Science and Technology

基　　金：中国工程物理研究院预研基金

摘　　要：用短时间内热浓ＨＣｌ还原高锝酸盐和热浓ＨＣｌ与ＫＩ联合还原高锝酸盐两种方法制备了四价锝，并考察了四价锝的有关性质。结果表明：热浓ＨＣｌ还原法短时间内获得四价锝产率为３５．７％，热浓ＨＣｌ与ＫＩ联用短时间内制备出了纯四价锝；在实验浓度范围内，３３８ｎｍ处吸光度与锝浓度间有良好的线性关系；在相当大ＨＣｌ浓度范围内，ＴｃＣｌ２－６很稳定，不水解，也不被空气氧化；在呈中性或碱性的溶液中，ＴｃＣｌ２－６水解为ＴｃＯ２·ｘＨ２Ｏ时则易被空气氧化；酸性介质中ＴｃＣｌ２－６对配体取代反应的稳定性比Ｔｃ（ＮＣＳ）２－６差。Tetravalent technetium is prepared by two methods: the reduction of pertechnetate by hot concentrated hydrochloric acid or by hot concentrated hydrochloric acid with potassium iodide in short time The property of tetravalent technetium is investigated The experiment results indicate that the yield of tetravalent technetium prepared by hot concentrated hydrochloric acid in short time is 35 7 % Pure tetravalent technetium is prepared by hot concentrated hydrochloric acid with potassium iodide in short time Good linear relationship between the concentration of technetium and its absorbance at 338 nm is found TcCl 2- 6 is very stable, neither hydrolysis nor oxidation by oxygen in a wide range of the concentrations of hydrochloric acid In neutral or basic solution, TcCl 2- 6 would hydrolyze to TcO 2· x H 2O, which is easily oxidized by oxygen With respect to the replacement reaction of complex, the stability of TcCl 2- 6 is weaker than Tc(NCS) 2- 6 in acidic medium

关 键 词：四价 锝 制备方法 化学性质 还原法 

分 类 号：O614.712[理学—无机化学]