the lanthanides and yttrium in the canadian certified reference materials project ( ccrmp ) new rare-earth mineral reference material , oka-2 , were determined by electrothermal atomic-absorption and inductively-coupled plasma atomic-emission spectrometry ( icpaes ) after sample decomposition with acids and separation of the rare-earth metals from phosphate and other matrix elements by precipitation as fluorides and oxalates .
C0043432
yttrium
C0025556
rare-earth metals