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本文以同一批一价~(201)Tl和三价~(201)Tl为供试品,采用醋酸纤维薄膜电泳、纸电泳、预饱和层析及非饱和层析等不同方法进行比较,发现上述方法均能将氯化铊中一价铊和三价铊分离,且当~(201)Tl中含少量三价铊时,测得一价供试品中一价铊(~(201)Tl)分别为99.92％(CV0.06％)、99.75％(CV0.02％)、99.87％(CV0.09％)和99.84％(CV0.09％),数值接近。但是,当以三价铊(~(201)Tl)作为供试品时,各方法测得的三价铊(~(201)Tl)含量分别为26.83％(CV29.82％)、19.06％(CV40.69％)、90.88％(CV0.53％)和15.65％(CV35.90％)。实验表明,四个方法测定三价铊的结果很不一致。采用Na_2HPO_4-丙酮(10:90)为溶剂、并在层析前预饱和15分钟、再上行层析的方法,能有效地测出供试品中三价~(201)Tl,而且误差小、重复性理想。为此,上述方法作为~(201)TlCl放射化学纯度的测定方法是适宜的。
In this paper, the same batch of monovalent ~ (201) Tl and trivalent ~ (201) Tl as test samples, using cellulose acetate membrane electrophoresis, paper electrophoresis, pre-saturation chromatography and unsaturated chromatography and other different methods were compared, The method can separate monovalent thallium and trivalent thallium in thallium chloride, and when a small amount of trivalent thallium is contained in ~ (201) Tl, monovalent thallium (~ (201) Tl) They were 99.92% (CV0.06%), 99.75% (CV0.02%), 99.87% (CV0.09%) and 99.84% (CV0.09%), respectively. However, the content of trivalent thallium (~ (201) Tl) measured by various methods was 26.83% (CV 29.82%) and 19.06% (respectively) when using trivalent thallium (~ (201) Tl) CV 40.69%), 90.88% (CV 0.53%) and 15.65% (CV 35.90%). Experiments show that four methods for the determination of trivalent thallium results are very inconsistent. The method of using Na_2HPO_4-acetone (10:90) as the solvent, pre-saturated for 15 minutes before chromatography, and then the method of upstream chromatography can effectively detect the trivalent ~ (201) Tl in the test sample with small error, Repeatability ideal. For this reason, the above method is suitable as a method for measuring the radiochemical purity of ~ (201) TlCl.