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同位素稀释技术在土壤微量元素地球化学活性分析中的应用
毛凌晨1, 刘力菠1, 孔惠1, 严南峡1, 叶华2
1.上海理工大学环境与建筑学院, 上海 200093;2.上海纺织建筑设计研究院有限公司, 上海 200082
摘要:
土壤中微量元素的地球化学活性是评价土壤质量以及环境风险的重要指标。现有的分析方法虽多,但因技术限制难以适用于所有类型的土壤,致使标准不统一,对科研工作提供的参考性不足。同位素稀释技术(isotopic dilution technique)对固/液交换过程造成的扰动极小,近年来被越来越多的研究人员认为是量化土壤微量元素地球化学活性最有效、最合理的方法之一。与电感耦合等离子质谱仪联用,该技术通过引入E值(E-value)来分析再分配过程中微量元素的同位素可交换量,从而量化土壤中微量元素的活性含量,所得结果不但能分析微量元素的生物可利用性,还可以为土壤环境质量评价提供更丰富的信息。本文重点介绍了同位素稀释法应用于微量元素地球化学活性分析的原理、方法的建立及其研究现状。
关键词:  土壤  微量元素  同位素可交换量  地球化学活性
DOI:10.13758/j.cnki.tr.2021.02.005
分类号:X142
基金项目:国家自然科学基金项目(41601229)资助。
Isotopic Dilution Technique in Analyzing Geochemical Lability of Soil Trace Elements
MAO Lingchen1, LIU Libo1, KONG Hui1, YAN Nanxia1, YE Hua2
1.School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China;2.Shanghai Textile Architectural Design Research Institute Co. Ltd., Shanghai 200082, China
Abstract:
The geochemical lability of trace elements in soil is an important index for its quality evaluation and environmental risk assessment. Although there are many existing analytical methods, it is not applicable to all types of soils due to technical limitations, thus, the standards are not unified and there is a lack of reference for scientific research work. The isotopic dilution technique for solid/liquid exchange process disturbance is tiny, therefore, it has been considered by more and more researchers in recent years as one of the most effective and appropriate methods to quantify the geochemical lability of soil trace elements. Combined with inductively coupled plasma mass spectrometry, the method quantifies the labile pool of trace elements in soil by introducing E-value as the isotope exchangeable pool of trace elements during redistribution. The obtained results can not only evaluate the bioavailability of trace elements, but also provide more abundant information for soil environmental quality evaluation. This paper mainly introduced the principle, method development and research process of isotope dilution technique in analysing trace element lability.
Key words:  Soil  Trace element  Isotopic exchangeable pool  Geochemical lability

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