LA-MC-ICP-MS 原位同位素分析综述

IF 4.1 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Jie Lin, Ao Yang, Ran Lin, Ji Mao, Zhaochu Hu, Yongsheng Liu
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引用次数: 0

摘要

LA-MC-ICP-MS 方法具有成本低、分析速度快、空间分辨率高、基质效应小等优点,已成为许多同位素系统分析的选择之一。然而,LA-MC-ICP-MS 在原位同位素组成测定的准确度、精密度和空间分辨率方面仍面临许多挑战,主要包括(1) 如何提高仪器灵敏度,进一步提高空间分辨率,实现低含量样品中同位素、多同位素或同位素与痕量元素的同时测定?(2) 如何扣除和修正干扰,提高同位素测定的准确性?(3) 如何校正同位素分馏?(4) 如何降低同位素的基体效应?如何开发基体匹配的参比材料? (5) 如何实现同位素的非基体匹配校正?采用高灵敏度锥组合、混合气体、屏蔽炬和合理的探测器阵列可以提高元素灵敏度。干扰包括本底干扰和基质元素干扰(等压干扰、多原子干扰和双电荷离子干扰)。为了减少甚至消除干扰,常用的方法包括干扰消除法、本底校正法和使用无干扰同位素进行评估的干扰校正法。同位素分馏校正主要包括外部标准校正和内部及伪内部标准归一化。对于非矩阵匹配校正,可采用多种方法,如飞秒激光、线扫描、低激光能量、湿等离子体条件、样品表面以下的光学设置、样品与标准的强度匹配等。在这篇综述中,我们系统地总结了上述挑战和解决方案,以促进 LA-MC-ICP-MS 在同位素测定中的研究和应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Review on in situ Isotopic Analysis by LA-MC-ICP-MS

The method of LA-MC-ICP-MS has become one choice for the analysis of many isotopic systems due to its relatively low cost, high analysis speed, high spatial resolution, and low matrix effect. However, there are still many challenges in the accuracy, precision, and spatial resolution of in situ isotopic composition determination by LA-MC-ICP-MS, which mainly include: (1) how to improve instrument sensitivity, further improve the spatial resolution, and achieve simultaneous determination of isotopes, multiple isotopes, or isotopes with trace elements in low-content samples? (2) how to deduct and correct interference to improve the accuracy of isotopic determination? (3) how to correct isotope fractionation? (4) how to reduce the matrix effect of isotopes? how to develop matrix-matched reference materials? and (5) how to achieve non-matrix-matched correction of isotopes? The high-sensitivity cone combinations, gas mixture, shield torch, and reasonable detector array can be applied to improve the elemental sensitivity. The interferences include the background interference and the interferences from the matrix elements (the isobaric interference, the polyatomic interference, and doubly charged ions interference). To reduce or even eliminate the interference, commonly used methods including interference elimination, background correction, and interference correction by evaluating with an interference-free isotope. Isotopic fractionation correction mainly involves external standard calibration and internal and pseudo-internal standard normalization. For non-matrix matched calibration, many methods can be applied, such as the femtosecond laser, line scan, low laser energy, wet plasma condition, optical setup below the sample surface, and matching the intensity of the sample and standard. In this review, we systematically summarized the above challenges and solutions to promote the study and application of LA-MC-ICP-MS in isotopic determination.

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来源期刊
Journal of Earth Science
Journal of Earth Science 地学-地球科学综合
CiteScore
5.50
自引率
12.10%
发文量
128
审稿时长
4.5 months
期刊介绍: Journal of Earth Science (previously known as Journal of China University of Geosciences), issued bimonthly through China University of Geosciences, covers all branches of geology and related technology in the exploration and utilization of earth resources. Founded in 1990 as the Journal of China University of Geosciences, this publication is expanding its breadth of coverage to an international scope. Coverage includes such topics as geology, petrology, mineralogy, ore deposit geology, tectonics, paleontology, stratigraphy, sedimentology, geochemistry, geophysics and environmental sciences. Articles published in recent issues include Tectonics in the Northwestern West Philippine Basin; Creep Damage Characteristics of Soft Rock under Disturbance Loads; Simplicial Indicator Kriging; Tephra Discovered in High Resolution Peat Sediment and Its Indication to Climatic Event. The journal offers discussion of new theories, methods and discoveries; reports on recent achievements in the geosciences; and timely reviews of selected subjects.
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