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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 La 4333.74/Ce 43330.90,Pr 4225.33/Ce4229.63,Nd 4061.09/Ce 4057.30及Y 4374.94/Ce 4376.88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: La 4238.38/Y 4235.73,La 3988.52/Y 3951.60,Pr 4222.98/Y 4235.73,Nd 4232.38/Y 4235.73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。
This work reports two kinds of spectrometric methods for the determination of lanthanum, praseodymium, neodymium and yttrium in cerium. (1) The chloride solution of the sample is dropped onto a carbon electrode treated with liquid paraffin, and dried to irradiate with an AC arc to perform spectroscopy. The sensitivities of La 4333.74 / Ce 43330.90, Pr 4225.33 / Ce4229.63, Nd 4061.09 / Ce 4057.30 and Y 4374.94 / Ce 4376.88 were 0.055%, 0.089%, 0.052% and 0.025%, respectively. The mean square error of a single shot was ± 4.7%, ± 10.8%, ± 7.0% and ± 7.0%, respectively. (2) For purer cerium, it is separated by ether extraction to concentrate the impurities contained therein, and yttrium is used as an internal standard and a carrier with less spectral lines to compensate for the loss in the separation process. The concentrate is still in chloride state using the excitation method described above. The measured sensitivity of lanthanum, praseodymium and neodymium was 0,01%, respectively, using the following pairs of lines: La 4238.38 / Y 4235.73, La 3988.52 / Y 3951.60, Pr 4222.98 / Y 4235.73, Nd 4232.38 / Y 4235.73, % And 0.028%. The general error is about ± 10%.