活性基体改进激光原位微量元素和同位素分析方法研究

项目名称： 活性基体改进激光原位微量元素和同位素分析方法研究

项目编号： No.41273030

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 胡兆初

作者单位： 中国地质大学（武汉）

项目金额： 95万元

中文摘要： 激光剥蚀等离子体质谱可进行固体微区原位微量元素和同位素准确精细分析，研究化学组成在微米尺度上的分布和分配规律，而被认为是地球化学分析方法研究领域近20年来最激动人心的重要进展之一。灵敏度是激光原位同位素和微量元素分析技术能力的最主要表征。本项目旨在通过研究甲醇、甲酸、乙醇、氮气和氢气这5种活性基体对激光原位同位素和微量元素分析灵敏度的特殊增敏作用，优选出最佳的活性基体或活性基体组合。建立活性基体改进激光原位同位素和微量元素分析新方法。力求在高空间分辨率，低含量样品的同位素和微量元素测定以及多种同位素或同位素与微量元素联合同时测定方面获得突破。与以往分析测试手段的进步往往带来了地球科学研究的突破一样，可以预见，活性基体改进激光原位新技术、新方法的开发必将极大地拓宽我们的工作领域，为更多地质问题的深入研究提供可能，也必将为推动地球科学成果的获得提供技术源泉。

中文关键词： 激光等离子体质谱；微量元素；同位素；活性基体；灵敏度

英文摘要： Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS/MC-ICP-MS) has been widely investigated as a powerful analytical technique for the direct analysis of solid samples. It has been considered as one of the most exciting progress in analytical geochemistry during the past two decades. The performance of LA-ICP-MS/MC-ICP-MS is mainly limited by its sensitivity due to its small sampling amount. The purpose of this project is to improve the sensitivity of LA-ICP-MS/MC-ICP-MS by using five active matrix modifiers (methanol, formic acid, ethanol, nitrogen, hydrogen). Based on the selected active matrix modifier or the active matrix modifier combination, we will establish the new in situ analytical method by using LA-ICP-MS/MC-ICP-MS. We would like to make breakthrough in high spatial resolution analysis, low content sample analysis and simultaneous analysis of both elements and isotope ratios. In order to keep the good analytical precision, these analyses require very high instrumental sensitivity. It is quite for sure that these new active matrix modified laser ablation analytical methods will definitely expand our work area, provide solutions for many geological problems, and support obtaining the fruitful geological results.

英文关键词： Laser ablation；Trace element；Isotope；Active matrix；Sensitivity