Determination of Trace Non-Rare Earth Impurities in High-Purity Eu_2O_3 by ICP-AES after Enrichment by Partial Dissolution of Gallium

A new enrichment method is proposed for trace nonrare earth impurities by partial dissolution of gallium. Based on the characteristic of equalpotential in spherical surface of liquid gallium and differences among EθGa3+/Ga(-0.56 V), EθEu3+/Eu(-2.407 V) and EθMen+/Me(-0.56 V), the trace nonrare earth impurities such as Cu, Pb, Fe, Co and Ni, which Eθare greater than -0.56 V, can be enriched by partially dissolved gallium from highpurity Eu2O3.Then these trace nonrare earth impurities can be determined directly by ICPAES. The method has been applied to the determination of trace nonrare earth impurities in highpurity Eu2O3. The results are in agreement with those provided by ICPMS. The standard recovery is 92%～106% with precision of 0.4%～3.3% RSD (n=6).