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目前已提出数种分离镭以对其进行射气测定的方法[1]。其中,最受欢迎的是耗费劳力少的快速法。这些分离方法,通常不包括沉淀硫酸镭和钡的操作。样品中存在的硫酸根离子可用磷酸[2]或将硫酸盐转为碳酸盐(不分离氢氧化物)[3]的方法除掉。应用这些方法,可对许多天然客体(重量不超过3-4克)中的镭进行测定。有时,为了分解含钍量高的矽酸盐试样,应用苛性钠和苏打尚嫌不够。在这种情况下,必须使用过氧化钠。应用铁坩埚分离含过氧化纳的试样,会把大量的铁提取出来,这给在容积为30-35毫升的盐酸中溶解沉渣造成了困难。如果以刚玉坩
Several methods of radium separation have been proposed for the determination of radium [1]. Among them, the most popular is the quick labor-intensive method. These methods of separation generally do not include the operation of precipitating the radium and barium sulphate. Sulfate ions present in the sample can be removed by phosphoric acid [2] or by conversion of sulfate to carbonate (without hydroxide) [3]. Using these methods, the radium in many natural objects (up to 3-4 grams in weight) can be determined. Occasionally, the use of caustic soda and soda is not enough to decompose silicate samples containing high levels of thorium. In this case, sodium peroxide must be used. The use of an iron crucible for the separation of samples containing sodium peroxide results in the extraction of large amounts of iron, which poses difficulties in dissolving the sediment in a volume of 30-35 ml of hydrochloric acid. If corundum crucible