自动电位滴定法精密测定硝酸钍溶液中的钍

采用氧化还原电对Fe(Ⅲ)/Fe(Ⅱ)指示滴定终点,建立了钍的精密络合滴定方法.对影响测量的主要因素:自动滴定仪的滴定体积的重现性、酸度、滴定剂EDTA浓度、缓冲液加入量、Fe(Ⅲ)用量等进行了研究,确定了最佳测量条件.建立了以电位指示滴定终点的钍的精密测定方法.结果表明,钍取样量为5 mg时,相对标准偏差达到了0.1%(n=6)....

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Bibliographic Details
Published in核化学与放射化学 Vol. 35; no. 6; pp. 371 - 374
Main Author 邵少雄 朱海巧 罗中艳 吴继宗 张倩慈 梁靓
Format Journal Article
LanguageChinese
Published 中国原子能科学研究院放射化学研究所,北京,102413 2013
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ISSN0253-9950
DOI10.7538/hhx.2013.35.06.0371

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Summary:采用氧化还原电对Fe(Ⅲ)/Fe(Ⅱ)指示滴定终点,建立了钍的精密络合滴定方法.对影响测量的主要因素:自动滴定仪的滴定体积的重现性、酸度、滴定剂EDTA浓度、缓冲液加入量、Fe(Ⅲ)用量等进行了研究,确定了最佳测量条件.建立了以电位指示滴定终点的钍的精密测定方法.结果表明,钍取样量为5 mg时,相对标准偏差达到了0.1%(n=6).
Bibliography:11-2045/TL
SHAO Shao-xiong(China Institute of Atomic Energy, P.O. Box 275(88), Beijing 102413, China) ZHU Hai-qiao(China Institute of Atomic Energy, P.O. Box 275(88), Beijing 102413, China) LUO Zhong-yan(China Institute of Atomic Energy, P.O. Box 275(88), Beijing 102413, China) WU Ji-zong(China Institute of Atomic Energy, P.O. Box 275(88), Beijing 102413, China) ZHANG Qian-ci(China Institute of Atomic Energy, P.O. Box 275(88), Beijing 102413, China) LIANG Liang(China Institute of Atomic Energy, P.O. Box 275(88), Beijing 102413, China)
thorium; complexometric titration; EDTA; Fe(Ⅲ)/Fe(Ⅱ)
The conventional method for determination of thorium is established by EDTA complexometric titration in which xylenol orange is used to indicate the titration end point.This paper presents a novel technique to identify the complexometric titration end point.The technique is that Fe(Ⅲ)/Fe(Ⅱ) redox couple replaces the use of xylenol orange to detect the end point by potentiometry.Various factors possibly influencing the measurement
ISSN:0253-9950
DOI:10.7538/hhx.2013.35.06.0371