激光剥蚀-电感耦合等离子体质谱:双外标结合基体归一定量校准策略

发布时间：2018-06-13 19:15

本文选题：激光剥蚀-电感耦合等离子体质谱 + 定量标准策略　；参考：《分析化学》2017年07期

【摘要】：定量校准策略是激光剥蚀电感耦合等离子体质谱(AICP-MS)分析技术的重要组成部分,直接影响分析数据的质量。本研究评估了现有玻璃标准物质定值不确定度的相对大小,并探究了NIST、MPI-DING和USGS系列玻璃标准物质之间的基体效应。结果表明,NIST610的定值不确定度优于其它玻璃标准物质,在本实验条件下,NIST、MPI-DING和USGS系列玻璃标准物质之间的基体效应可忽略不计。在此基础上提出了双外标结合基体归一定量校准策略,外标分别为NIST610和St Hs6/80-G。此策略克服了由于NIST610主量成分与地质样品差别大而造成的主量元素准确度差以及St Hs6/80-G中某些微量元素含量低、定值不确定度较大等缺点。对比采用3种定量校准策略(单外标NSIT610基体归一法、单外标St Hs6/80G基体归一法和双外标基体归一法)校准的ML3B-G数据可知,双外标基体归一法有效避免了单外标基体归一法的不足,并提高了分析数据的准确度。采用双外标结合基体归一定量校准策略校准了BCR-2G、CGSG-2和KL-2G中的主量元素和微量元素。结果表明,绝大多数分析数据在定值不确定度范围内,验证了此校准策略的实用性。同时,本研究得到的主量微量元素数据进一步补充了BCR-2G、CGSG-2和KL-2G的定值数据库。
[Abstract]:Quantitative calibration strategy is an important part of AICP-MS analysis technology, which directly affects the quality of analytical data. In this study, the relative uncertainty of the existing glass reference materials was evaluated, and the matrix effect between NIST MPI-DING and USGS series glass reference materials was investigated. The results show that the uncertainty of NIST610 is better than that of other glass reference materials, and the matrix effect between NIST MPI-DING and USGS series glass reference materials is negligible. On the basis of this, the calibration strategy of double external standard binding matrix is put forward. The external standard is NIST610 and St HS 6 / 80-G, and the external standard is NIST610 and St Hs6 / 80-Grespectively. This strategy overcomes the shortcomings of poor accuracy of principal element caused by the difference between NIST610 principal component and geological sample, low content of some trace elements in St Hs6 / 80-G and high uncertainty of definite value. Comparing the ML3B-G data with three kinds of quantitative calibration strategies (single external standard NSIT610 matrix normalization method, single external standard St Hs6 / 80G matrix normalization method and double external standard matrix normalization method), it can be seen that the double external standard matrix normalization method effectively avoids the deficiency of the single external standard matrix normalization method. The accuracy of analysis data is improved. The main elements and trace elements in BCR-2G CGSG-2 and KL-2G were calibrated by double external standard and matrix regression calibration strategy. The results show that most of the analytical data are in the range of uncertainty, which verifies the practicability of the calibration strategy. At the same time, the main trace element data obtained in this study further replenish the fixed value database of BCR-2G CGSG-2 and KL-2G.
【作者单位】： Geowissenschaftliches
【基金】：国家留学基金项目(No.201306410007) 中国地质科学院基本科研业务费项目(No.YYWF201622)资助
【分类号】：O657.63

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