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金属钙与氧元素容易化合成CaO,其又容易吸收空气中水份形成Ca(OH)_2,并有可能吸收环境中Co_2形成CaCO_3。因此,对高纯钙中碳的分析来说,试样处理和称重都要在惰性气氛保护下,或在高真空系统内进行。文献[1,2]提出的真空蒸馏法测定碱金属碱土金属中炭,系将主体金属蒸馏掉、残渣按常规方法测定碳,但这种方法装置复杂,操作不便。本试验采用直接燃烧法,把产生的大量CaO,用复盖物抑制挥发,控制其对CO_2的吸附,避免碳的损失。
Metallic calcium and oxygen readily facilitate the synthesis of CaO, which in turn easily absorbs moisture in the air to form Ca (OH) _2 and possibly absorbs Co_2 in the environment to form CaCO_3. Therefore, for the analysis of carbon in high-purity calcium, both sample handling and weighing should be carried out under inert atmosphere or in a high-vacuum system. The method of vacuum distillation proposed in reference [1,2] for the determination of carbon in alkaline earth metal is to distill off the main metal and determine the carbon according to the conventional method. However, this method is complicated and inconvenient to operate. In this experiment, the direct combustion method was used to control the large amount of CaO produced, and to suppress the volatilization by the covering material, to control the adsorption of CO 2 and to avoid the carbon loss.