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本文研究了EGTA和DTPA对稀土元素可见光区的吸收光谱的增敏作用.采用偏最小二乘(PLS)分光光度法拟定在DTPA—六次甲基四胺体系中测定Eu、Sm和Pr、Ho;在EGTA—六次甲基四胺体系中测定Tm.Nd.实验结果表明对合成样品的测定相对误差均小于6%,回收率为94～105%,混合稀土样品测定结果与x—荧光配分值相比较相对误差小于10%,本方法适合于一般的工业分析,用于测定指定的六个稀土元素,设备简单,操作方便.
In this paper, the sensitization of EGTA and DTPA to the absorption spectra of rare earth elements in the visible region was studied.The PLS spectrophotometry was used to determine the Eu, Sm and Pr, Ho in DTPA-hexamethylenetetramine ; The determination of Tm.Nd in EGTA-hexamethylenetetramine system showed that the relative errors of the determination of the synthetic samples were less than 6% and the recoveries were 94-105%. The results of the mixed rare earth samples and the x-fluorescence complex The relative error of the value is less than 10%, the method is suitable for general industrial analysis, for the determination of the specified six rare earth elements, the device is simple, easy to operate.