| 高REE-Nb-Fe-Mn样品Mg同位素测定的化学分离方法 |
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| 引用本文： | 李世珍,房楠,孙剑,陈岳龙,朱祥坤.高REE-Nb-Fe-Mn样品Mg同位素测定的化学分离方法[J].吉林大学学报(地球科学版),2013,43(1):142-148. |
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| 作者姓名： | 李世珍 房楠 孙剑 陈岳龙 朱祥坤 |
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| 作者单位： | 1.中国地质科学院地质研究所/国土资源部同位素地质重点实验室/大陆构造与动力学国家重点实验室，北京100037;
2.中国地质大学地球科学与资源学院，北京100083 |
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| 基金项目： | 国家自然科学基金项目(40973037);国土资源公益性行业科研专项项目(200911043-14) |
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| 摘 要： | 利用多接收电感耦合等离子体质谱仪测定Mg同位素比值时，样品溶液中的基质元素可影响Mg同位素比值的准确测定。根据白云鄂博样品富含REE、Nb、Fe(REE质量分数可达10%、Nb质量分数可达0.1%)等元素的特性，本研究在评估测试溶液中Nd(REE)、Mn元素质量比对Mg同位素比值影响的基础上，建立了适用于富含REE、Nb、Fe等元素的特殊样品中Mg同位素的化学纯化方法。研究表明，当m（Nd）/m（Mg）>0.2、m（Mn）/m（Mg）>0.2时，REE和Mn的存在明显影响Mg同位素测定值的准确性，应予以去除。所建纯化方法首先是利用AG MP-1阴离子交换树脂，以10 mol/L HCl+0.001% H2O2溶液为上样介质和淋洗液，接取前2.5 mL淋洗液，去除样品中 Fe、Mn等杂质元素；然后利用AG50W-X12阳离子交换树脂，以2 mol/L HCl为上样介质和淋洗液，去除REE、Nb等杂质元素。所建方法满足多接收器等离子体质谱进行高REE-Nb-Fe-Mn样品中Mg同位素测定的要求。
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| 关 键 词： | 基质效应 分离纯化 Mg同位素 高REE-Nb-Fe-Mn样品 同位素 白云鄂博 |
| 收稿时间： | 2012-04-16 |
Chemical Separation of the Sample with High REE-Nb-Fe-Mn Contents for Mg Isotope Ratio Measurements |
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| Li Shizhen,Fang Nan,Sun Jian,Chen Yuelong,Zhu Xiangkun.Chemical Separation of the Sample with High REE-Nb-Fe-Mn Contents for Mg Isotope Ratio Measurements[J].Journal of Jilin Unviersity:Earth Science Edition,2013,43(1):142-148. |
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| Authors: | Li Shizhen Fang Nan Sun Jian Chen Yuelong Zhu Xiangkun |
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| Institution: | 1.Institute of Geology，Chinese Academy of Geological Sciences/Laboratory of Isotope Geology MLR/State Key Laboratory for Continental Tectonics and Dynamics，Beijing100037，China;
2.School of Earth Science and Mineral Resources，China University of Geosciences，Beijing100083，China |
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| Abstract: | The measured values of Mg isotope ratios using multi-collector inductively coupled plasma mass spectrometry may be effected by matrix elements to certain extent. Some geological samples such as those from the Baiyan Obo ore deposit may have exceptionally high contents of REE, Nb, Fe and Mn. An investigation of effects of matrix elements on Mg isotope ratio measurement has been carried out. The results show that the measured δ26Mg deviates from true value when the matrix/Mg(mass fraction) is over 0.2. Thus it is necessary to resolve these matrix elements before determining the δ26Mg value. Firstly, the protocols established for Mg purification are using AG MP-1 anion exchange resin and 2.5 mL 10 mol/L HCl+0.001% H2O2 reagents as loading medium and eluant, the first 2.5 mL eluant contains Mg but no Fe and Mn; and then using AG50W-X12 cation exchange resin and 2 mol/L HCl as loading medium and eluants, the eluant from 2-7 mL 2 mol/L contain Mg but no REE，Nb and other matrix elemts. |
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| Keywords: | matrix effects separation Mg isotope the sample with high REE-Nb-Fe-Mn isotopes Bayan Obo |
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