【摘要】 <正> 钙以金属、氧化物、盐等存在于金属钠中。当用金属钠作为快堆冷却剂时,钠中含钙量必须控制在<10ppm,因此,必须在入堆钠和除钙工艺过程中不断对钙进行监测。分析钠中微量钙的方法主要有容量法、分光光度法、X光—荧光光谱法、ICP—AES、火焰光度法及原子吸收法。其中真空蒸馏—原子吸收法的优点是用物理方法分离基体,避免了基体干扰和溶解金属钠的繁杂操作,可以取较多样品蒸馏以提高测试精度,且一份试液可测多种金属元素。正如钠中其他微量杂质分析一样,钠中更多还原

【Abstract】 This paper describes a method for determining calcium in sodium at the 2 ppm. level and upwards. The matrix sodium is removed by vacuum distillation at 360℃ and 10^-3pa. The calcium in the residue is determined by atomic absorption spectrophotometry. Additions of calcium to sodium for the levels 2 to 500 ppm. have been recovered satisfactorily with the relative standard deviation of 5.3—7.2%. The possibility loss of calcium and its compound because of distillation has bcen investigated. We have also studied interferences of 20 kinds of impurity elements and supressing methods.更多还原