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用偶氮肿Ⅰ光度法及Th~(234)示踪法证明,自15—50毫升0.5—1.0N硝酸溶液中,由3—5毫克铈所生成的碘酸高铈可共沉淀0.1—50微克钍。溶液体积较大时,在滤液中再加3毫克高铈离子进行第二次共沉淀,仍可得定量分离。大多数常见离子与希土元素不干扰。此法特别适用于大量希土存在时痕量钍的分离。有较多的钛、锆、锡时,可将沉淀溶解,沉淀草酸铈以浓集钍,而与钛、锆、锡等分离。溶解沉淀井还原高鈰离子后,可以用偶氮胂Ⅰ光度法测定钍。用此法分析几种试样的结果,与对照分析的结果相符。
Azo I spectrophotometry and Th ~ (234) tracer method proved that from 15-50 ml of 0.5-1.0N nitric acid solution, from 3-5 mg of cerium generated ceric iodate coprecipitate 0.1-50 Micron thorium. When the volume of the solution is large, 3 mg of cerium ions are added to the filtrate for the second coprecipitation, and quantitative separation can still be obtained. Most common ions and rare earth elements do not interfere. This method is especially suitable for the separation of traces of thorium in the presence of a large number of rare earths. There are more titanium, zirconium, tin, the precipitate can be dissolved precipitate cerium oxalate to enrich thorium, but with titanium, zirconium, tin separation. Thorium can be measured with the arsenazo I photometric method after dissolving the precipitation well to reduce the ceric ions. The results of several samples analyzed by this method were consistent with those of the control analysis.