气相色谱-同位素比质谱技术在易燃液体来源鉴别中的研究进展

Research progress of GC-IRMS in the identification of flammable liquid sources

涉火案件对人民群众的人身和财产安全造成了极大威胁,开展此类案件中常见物证——易燃液体的来源鉴别研究对于火灾案(事)件调查具有重要的意义。近年来稳定同位素技术被证明在溯源方面具有较大优势,利用该技术对汽油、柴油、醇类等常见易燃液体进行来源鉴别分析是法庭科学领域的重要发展方向。气相色谱-同位素比质谱技术(GC-IRMS)结合了气相色谱分离与稳定同位素溯源的技术优势,能够分析混合物中单个化合物的同位素组成,对汽油、柴油等组成复杂的易燃液体来源鉴别分析具有较大优势。本文简要介绍了GC-IRMS技术的原理和优势,对汽油、柴油和醇类等易燃液体稳定同位素分析中的前处理方法、特征组分选择和来源鉴别应用进行了相关文献综述分析,并对GC-IRMS技术在易燃液体来源鉴别中的未来发展进行了展望,以期为开展相关研究的科研人员提供参考和借鉴。

Fire-related cases pose a great threat to the safety of people and property,and the identification of flammable liquids,a common physical evidence in such cases,is of great significance to the investigation of fire cases.The identification of the source of flammable liquids,a common physical evidence in such cases,is of great importance to the investigation of fire-related cases.In re-cent years,stable isotope techniques have proven to be advantageous in traceability,and the use of such techniques to identify the source of common flammable liquids such as petrol,diesel and alcohols is an important development in the field of court science.Gas chromatography-isotope ratio mass spectrometry(GC-IRMS)combines the technical advantages of gas chromatographic separa-tion and stable isotope traceability to analyse the isotopic composition of individual compounds in mixtures,which is advantageous for source identification analysis of flammable liquids with complex compositions such as gasoline and diesel fuel.This paper briefly introduces the principles and advantages of GC-IRMS technology,presents a review of the literature on the pre-treatment methods,the selection of the characteristic components and the applications of stable isotope analysis for flammable liquids such as gasoline,diesel and alcohols,and provides an outlook on the future development of GC-IRMS technology for the source identification of flam-mable liquids,with a view to providing reference and reference for researchers conducting related research.The future development of the GC-IRMS technique for the identification of flammable liquids is also discussed.