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《Chinese Rare Earths》 2005-03
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Analysis of Different Valence States of Cerium in Ceric Hydroxide by Titration

ZHONG Xue-ming,TANG Zhou,ZANG Xian-ming,WANG Yong (Department of Environmental and Chemical Engineering,Nanchang Institute of Aeronautical Technology,Nanchang 330034,China )  
This paper has investigated the analysis of different valence states of cerium in ceric hydroxide by titration. Ceric in samples is determined by ferrous ammonium sulfate that is protected by aluminum metal. Reduced the ceric to trivalent with hydroxylamine hydrochloride as a reducer,then total cerium is determined by EDTA. The content deviation between total cerium and ceric is just the content of trivalent cerium in the sample. While the Ce(Ⅳ)/Ce(Ⅲ) ratio from 95/5 to 70/30,the recovery of ceric is in the range of 99.68 ~ 99.92%,the recovery of total cerium 99.65 ~ 99.90 %. The valence states of cerium in ceric hydroxide was determined by titration method,the results are satisfactory.
【Fund】: 南昌航空工业学院科研基金重点项目(EA20030250)
【CateGory Index】: O614.332
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