【摘要】 <正> 我们在进行变价稀土的研究中经常要合成SmI₂,利用金属钐和碘化汞在高温高真空条件下使其固相合成。在该过程中三碘化钐是个中间过渡状态,最终转化为SmI₂,这样合成的SmI₂中是否含有SmI₃?钐的价态测试,因而是一个重要环节。我们曾用X-射线分析法进行分析。该法精确度不高,若SmI₃的含量在1％以下时,就测不出它的准确含量。用重量法分析时,是以SmI₂ 的含量为100％为前题的。若含有SmI₃时则不能进行分析。用差热分析测更多还原

【Abstract】 The experiment confirmed that polarography is desirable for the determination of oxidation state of samarium with reliable results. The amount of SmI₃ involved in SmI₂ can be directly determined, and purity of SmI₂ obtained simultaneously. The lowest concentration of Sm（Ⅲ）ion detected is 2×10^-4M. The wave height of Sm（Ⅱ）ion gives a linear response in the range of 2×10^-4 to 1×10^-3M. Samarium diiodide is easily oxidized by oxygen as well as the trace quantity of water contained in organic solvents. Therefore anhydrous and oxygenfree THF can be used as a solvent and NaB（C₆H₅）₄ as a supporting electrolyte.更多还原