色谱与MC-ICP-MS联用在线同位素分析的研究进展

On-line Isotopic Analysis by Chromatography Coupled to MC-ICP-MS

近年来,随着多接收电感耦合等离子体质谱(MC-ICP-MS)的发展,金属同位素分析逐渐成为研究金属元素循环,深入了解其迁移转化及开展污染溯源与示踪的有效工具,日益引起了人们的广泛关注。在线同位素分析方法可以简化处理流程,更快速有效地获取同位素信息,逐渐引起了研究者的兴趣;另一方面,不同的金属和非金属以各种不同的化学形态存在于环境中,开发新型的元素及其形态同位素在线分析方法,准确获取形态同位素的组成信息可为深入研究元素循环、了解各种化学和生物反应过程等方面提供更丰富的信息,近年来也取得了显著进展。该文回顾了2000年以来色谱与MC-ICP-MS联用在线同位素分析的主要工作,重点对影响色谱与MC-ICP-MS联用在线同位素分析时的瞬态信号处理方式和质量歧视校正方法进行了讨论和总结。最后,从地球化学、环境和生物研究等方面对其应用进行了概述,并对色谱联用同位素分析的发展进行了展望。

In recent years,with the development of multiple-collector inductively coupled plasma mass spectrometry(MC-ICP-MS),metal isotope analysis has gradually become an effective tool to study the cycle of metal elements,understanding their migration and transformation,and tracing pollution.However,metals and nonmetals in the environment typically exist with different chemical speciation,so the development of new methods for on-line analysis of species-specific stable isotopes will open a new perspective for better understanding the element cycle and various chemical and biological processes.Combination of chromatography with MC-ICP-MS has attracted an increasing attention in recent years as it could realize the online separation of matrix and interference elements in the sample,greatly reducing the time of sample pretreatment,saving the cost,reducing the crosscontamination that may occur in the process of sample separation and purification,and accordingly making it possible to quickly obtain high-precision isotope ratio.Furthermore,it could also obtain the species-specific stable isotope composition of different elements,which is helpful to better understand the biogeochemical cycle of different element speciation,providing ideas and tools for understanding and solving geological,life and environmental problems.In this paper,the representative work on isotope analysis by chromatography coupled to MC-ICP-MS from 2000 to 2021 is reviewed.The transient signal processing methods and mass bias correction methods affecting the chromatography coupled to MC-ICP-MS are discussed and summarized.Finally,the applications of this method in geochemical,environmental and biological fields are also briefly summarized,and the development of isotopic analysis by chromatography coupled to MC-ICP-MS is prospected.