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

引用本文: 张艳灵, 肖应凯, 马云麒, 刘志启, 罗重光, 贺茂勇, 刘玉秀. 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[J]. 分析化学, 2016, 44(5): 809-815. doi: 10.11895/j.issn.0253-3820.150840 shu

Citation: ZHANG Yan-Ling, XIAO Ying-Kai, MA Yun-Qi, LIU Zhi-Qi, LUO Chong-Guang, HE Mao-Yong, LIU Yu-Xiu. Sample Preparation for Isotope Determination of Boron in Clay Sediments by Three-step Ion-exchange Method[J]. Chinese Journal of Analytical Chemistry, 2016, 44(5): 809-815. doi: 10.11895/j.issn.0253-3820.150840 shu

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

1.
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;
2.
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;
3.
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
基金项目:
本文系国家自然科学基金(No.41403014)、"西部之光"人才培养计划(2012)、青海省自然科学基金(No.2014-Z-931Q)、中国科学院青海盐湖研究所青年引导基金(No.Y460151040)资助

摘要: 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pH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-exchanger Ⅱ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。

关键词:

English

Sample Preparation for Isotope Determination of Boron in Clay Sediments by Three-step Ion-exchange Method

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
Received Date: 22 October 2015
Revised Date: 12 December 2015
Fund Project:
This work was supported by the National Natural Science Foundation of China (No.41403014)

Abstract: When clay sediments were dissolved by hydrochloric acid, there will form large amounts of water insoluble hydroxide precipitation of Al, 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 and purification of boron was proposed. Firstly, all the Al, Fe and rare earth elements which can generate water insoluble hydroxide, were removed by cation resin column with AG 50 W×8. Next, boron in the sample solutions without Al, Fe and rare earth elements was extracted by boron special resin column with Amberlite IRA 743. Finally, the boron solutions were further purified by anion and cation resin mixed with Ion-exchanger Ⅱand AG 50 W×8. The experimental results showed that the recovery of boron was more than 90% and no obvious boron isotope fractionation could be achieved using this three-step ion-exchange method. Therefore, this method could meet the needs of the high-precision determination of boron isotope of clay sediments.

Key words:

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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

English

Sample Preparation for Isotope Determination of Boron in Clay Sediments by Three-step Ion-exchange Method

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中国化学会秘书处

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

English

Sample Preparation for Isotope Determination of Boron in Clay Sediments by Three-step Ion-exchange Method

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

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CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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