铈中微量镧、镨、钕与钇的光谱测定

本工作报告铈中杂质镧、镨,钕及钇的两种光谱测定方法.(1)将试样的氯化物溶液滴于经液体石腊处理过的碳电极上,干燥后以交流电弧激发进行摄谱.采用线对La4333.74/Ce43330.90,Pr4225.33/Ce4229.63,Nd4061.09/Ce4057.30及Y4374.94/Ce4376.88时测定灵敏度分别可达0.055%,0.089%,0.052%,0.025%.单次摄谱的均方误差分别为±4.7%,±10.8%,±7.0%及±7.0%.(2)对于较纯的铈,则采用乙醚萃取先行分离,以浓缩其中所含的杂质,并采用谱线较少的元素钇作内标及载体,以补偿分离过程中损失.浓缩物仍以氯化物溶液状态用上述的激发方法进行摄谱.采用下列线对La4238.38/Y4235.73,La3988.52/Y3951.60,Pr4222.98/Y4235.73,Nd4232.38/Y4235.73取样100毫克时,镧、镨及钕的测定灵敏度分别可达0,01%;0.025%及0.028%.一般误差约在±10%左右.