滴定法分析氢氧化铈中铈的价态  

Analysis of Different Valence States of Cerium in Ceric Hydroxide by Titration

作　　者：钟学明[1] 唐洲[1] 藏献明[1] 王勇[1] 

机构地区：[1]南昌航空工业学院环境与化学工程系,江西南昌330034

出　　处：《稀土》2005年第3期58-60,共3页Chinese Rare Earths

基　　金：南昌航空工业学院科研基金重点项目(EA20030250)

摘　　要：研究了滴定法分析氢氧化铈中铈的价态。采用硫酸亚铁铵法测定氢氧化铈中四价铈含量;盐酸羟胺还原四价铈后,EDTA法测定氢氧化铈中总铈含量;总铈含量与四价铈之差为氢氧化铈中三价铈含量。当Ce( )/Ce( )在95/5～70/30范围之内时,四价铈的标准回收率在99.68%～99.92%范围之内,总铈的回收率在99.65%～99.90%范围之内。对氢氧化铈样品中铈的价态进行了分析,结果令人满意。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.

关 键 词：氢氧化铈 滴定 价态分析 

分 类 号：O655.23[理学—分析化学]