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有关铀中稀土的测定,在文献中已有较详细的报导。随着ICP光源的出现,为痕量稀土的测定提供了新的灵敏手段,而水平式ICP-AES法较竖直式ICP-AES法具有更强的检测能力。检测限可好5—10倍或10倍以上。本文在前一工作基础上,采用水平式ICP作激发光源,使检测下限有了显著改善。取样1g时,测定下限可达0.4—2ppb。此法较之中子活化法或火花源质谱法更为简便,易于普及,可用于测定UF_6或其它铀化合物中痕量Gd、Sm、Dy、Eu,并可同时测定其它稀土。
The determination of rare earths in uranium has been reported in more detail in the literature. With the advent of ICP light sources, a new sensitive method for the determination of trace rare earths has been provided, while the horizontal ICP-AES method has more detection capability than the vertical ICP-AES method. The detection limit can be 5-10 times or more than 10 times. Based on the previous work, using horizontal ICP as the excitation light source, the detection limit has been significantly improved. Sampling 1g, the lower limit of determination of up to 0.4-2ppb. Compared with neutron activation or spark source mass spectrometry, this method is simple and easy to popularize. It can be used to determine trace amounts of Gd, Sm, Dy and Eu in UF_6 or other uranium compounds and to simultaneously measure other rare earths.