TODGA树脂小柱分离-多接收电感耦合等离子体质谱(MC-ICP-MS)法测定岩石样品中Nd同位素比值  

Determination of Nd Isotope Ratios in Rock Samples by Multicollector Inductively Coupled Plasma-Mass Spectrometry(MC-ICP-MS)with a Mini-column Containing TODGA Resin for Separation

作　　者：赵寿骞 孙亚莉 管秋云 王玉琼 ZHAO Shouqian;SUN Yali;GUAN Quiyun;WANG Yuqiong(Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China;State Key Laboratory of Tibetan Plateau Earth System,Environment and Resources(TPESER),Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China;Wuhan Huanyi Motor Intelligent Technology Co.,Ltd.,Wuhan,Hubei 430058,China)

机构地区：[1]中国科学院青藏高原研究所,北京100101 [2]中国科学院青藏高原研究所,青藏高原地球系统与资源环境全国重点实验室,北京100101 [3]武汉环益电机智能科技有限公司,武汉430058

出　　处：《中国无机分析化学》2023年第1期25-30,共6页Chinese Journal of Inorganic Analytical Chemistry

基　　金：国家自然科学基金资助项目(41873019,42073023)。

摘　　要：通过改进岩石样品分析物Nd的化学分离,实现Nd同位素比值的准确分析,为研究青藏高原岩石成因,揭示物质来源提供技术支持。采用TODGA萃淋树脂分离基体及其与Nd相邻的稀土元素,用多接收电感耦合等离子体质谱(MC-ICP-MS)法测定Nd同位素比值,建立了简捷实用的地质样品中Nd同位素分析方法。样品经HF-HNO_(3)分解,HNO_(3)(3 mol/L)-H_(3) BO_(3)(0.12 mol/L)提取,上柱后,先用6 mL HCl(2.8 mol/L)淋洗干扰轻稀土,再用6 mL HCl(2.2 mol/L)淋洗分析物Nd,Nd淋洗液由MC-ICP-MS测定其同位素比值。分析国际岩石标准物质BCR-2、BHVO-2和AGV-2,所得^(143) Nd/^(144) Nd同位素比值(平均值±2σ)分别为0.512638±0.000007、0.512990±0.0000012和0.512792±0.000016,这些同位素数据在误差范围内,与推荐值和文献值完全一致。方法适合各种类型地质样品,为西藏不同地区不同岩石提供了可靠的Nd同位素分析数据。By improving the chemical separation of analyte Nd in rock materials,accurate analysis of Nd isotope ratios was achieved.As a result,this can provide technically supports for the study of petrogenesis and the exploration of material sources for the formation of the Tibetan Plateau.A practical method was developed for the separation of Nd with matrix and other rare earth elements(REE)in geological rocks using a mini-column containing TODGA resin and the precise determination of Nd isotope ratios by multicollector inductively coupled plasma-mass spectrometry(MC-ICP-MS).The samples were digested by HF-HNO_(3) and then transferred to HNO_(3)(3 mol/L)-H_(3)BO_(3)(0.12 mol/L)solution.After loading the solutions onto the TODGA resin column,the column was first eluted with 6 mL HCl(2.8 mol/L)for light REE and then eluted with 6 mL HCl(2.2 mol/L)for Nd analyte.The latter was measured for Nd isotope ratios by MC-ICP-MS.This separation procedure was validated by measuring the ^(143) Nd/^(144) Nd ratios(mean±2σ)of certified rock reference materials,BCR-2,BHVO-2 and AGV-2,which were determined to be 0.512638±0.0000007,0.512990±0.0000012 and 0.512792±0.000016,respectively.These data were consistent with the certified and literature values within the error ranges.This method was applicable to various geological materials and could be used for accurate analysis of Nd isotope ratios for different types of rocks from different regions of Tibetan Plateau.

关 键 词：TODGA萃淋树脂 Nd同位素比值 岩石样品 青藏高原 多接收电感耦合等离子体质谱法 

分 类 号：O657.63[理学—分析化学] TH843[理学—化学]