The direct simultaneous determination of six trace rare earth impurities in high purity erbium oxide was described, using a PGS-2 plate grating spectrograph equiped with an ICP source. The sample solution containing ethanol was introduced into the ICP with desolvation. For the sample solution containing 5mg/ml of Er_2O_3, the determination limits were 0.0010% for Pr_6O_(11) and Sm_2O_3, 0.0020% for Dy_2O_3, Ho_2O_3 and Tm_2O_3, 0.00080% for Y_2O_3. The accuracy was satisfactory and the relative standard deviation was in the range of 4.4%～6.8%.
Chinese Journal of Analytical Chemistry
Rare earth elements
Inductively coupled plasma.