三步离子交换方法用于粘土沉积物酸溶相中硼同位素测定

在采用酸溶法进行粘土沉积物中硼同位素组成测定时,大量存在的Al、Fe、稀土等元素在较高p H溶液中会形成能强烈吸附硼的氢氧化物沉淀,对硼的提取和硼同位素的测定产生较大影响。有效去除这些干扰元素一直是测定粘土沉积物酸溶相中硼同位素组成的瓶颈。本实验采用三步离子交换法萃取和纯化粘土沉积物中的硼,以AG 50W×8阳离子树脂柱去除所有能生成水不溶性氢氧化物的Al、Fe、稀土等元素,再采用Amberlite IRA 743硼特效树脂柱提取硼,最后采用Ion-exchangerⅡ与AG 50W×8组成的阴阳离子混合树脂柱进一步纯化硼提取液。结果表明,采用以上三步离子交换法提取粘土沉积物中硼的回收率高于9...

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Published in分析化学 Vol. 44; no. 5; pp. 809 - 815
Main Author 张艳灵 肖应凯 马云麒 刘志启 罗重光 贺茂勇 刘玉秀
Format Journal Article
LanguageChinese
Published 中国科学院青海盐湖研究所,盐湖地质与环境实验室,西宁810008%中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵阳550002%中国科学院地球环境研究所,黄土与第四纪国家重点实验室,西安710075 2016
Subjects
同位素测定
提取与纯化
硼
离子交换法
粘土沉积物
Isotope determination
同位素测定
Extraction and purification
Boron
提取与纯化
Clay sediments
Ion exchange method
硼
粘土沉积物
离子交换法
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ISSN0253-3820
DOI10.11895/j.issn.0253-3820.150840

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Summary:在采用酸溶法进行粘土沉积物中硼同位素组成测定时,大量存在的Al、Fe、稀土等元素在较高p H溶液中会形成能强烈吸附硼的氢氧化物沉淀,对硼的提取和硼同位素的测定产生较大影响。有效去除这些干扰元素一直是测定粘土沉积物酸溶相中硼同位素组成的瓶颈。本实验采用三步离子交换法萃取和纯化粘土沉积物中的硼,以AG 50W×8阳离子树脂柱去除所有能生成水不溶性氢氧化物的Al、Fe、稀土等元素,再采用Amberlite IRA 743硼特效树脂柱提取硼,最后采用Ion-exchangerⅡ与AG 50W×8组成的阴阳离子混合树脂柱进一步纯化硼提取液。结果表明,采用以上三步离子交换法提取粘土沉积物中硼的回收率高于90%,未观察到明显的硼同位素分馏,可满足粘土沉积物酸溶相中硼同位素组成高精度测定的需要。
Bibliography:Clay sediments; Boron; Ion exchange method; Extraction and purification; Isotope determination
22-1125/O6
ZHANG Yan-Ling, XIAO Ying-Kai , MA Yun-Qi , LIU Zhi-Qi , LUO Chong-Guang , HE Mao-Yong , LIU Yu-Xiu （ 1.CAS Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China; 2. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China; 3. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi＇an 710075, China）
When clay sediments were dissolved by hydrochloric acid, there will form large amounts of water insoluble hydroxide precipitation of A1, Fe and rare earth elements which can absorb boron strongly in high pH solutions. The hydroxide precipitation will greatly affect the extraction of boron and the determination of boron isotope. In this experiment, a new three-step ion-exchange method for the separation
ISSN:0253-3820
DOI:10.11895/j.issn.0253-3820.150840