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CHEMICAL-SPECTRAL DETERMINATION OF TRACE LANTHANIDE IMPURITIES IN HIGH-PURITY YTTRIUM OXIDE——EXTRATION CHROMATOGRAPHIC SEPARATION WITH NAPHTHENIC ACID-HYDROCHLORIC ACID SYSTEM
PENG CHUN-LIN, PEI AI-LI, WU SHAO-LE, JI YONG-YI, YAN BAI-ZHEN, SUI XI-YUN, LIU CHUN-LAN
Acta Chimica Sinica . 1979, (4): 268 -274 .