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为了识别环境中有机污染物的来源和迁移转化,在线的单体稳定同位素分析(CSIA)是必不可少的关键技术,但是在实际应用中还存在问题。本文评价了目前已经开发的6种在线测定单体稳定同位素仪器的发展动态,包括气相色谱-同位素比值质谱计(GC-IRMS)、液相色谱-同位素比值质谱计(LC-IRMS)、直接引进-气相色谱-同位素比值质谱计(DI-GC-IRMS)、气相色谱-四极杆质谱计(GC-qMS)、气相色谱-多接收器电感耦合等离子体质谱计(GC-MC-ICPMS)、气相色谱-光强衰荡光谱仪(GC-CRDS)。提出了在线测试中的5个值得注意的问题:①样品的预富集;②气相色谱(GC)和液相色谱(LC)分离;③多种仪器和多种方法选择使用;④有机化合物稳定同位素标准物质的开发;⑤安全保障。提出了三点建议:一是大力发展直接注入而不经过燃烧的有机污染物同位素测试技术,例如GC-qMS和GC-CRDS技术;二是继续开发研究GC-MC-ICPMS测定有机氯和有机溴同位素技术;三是快速研制有机化合物稳定同位素的国际标准物质。本文认为,在进行单体化合物同位素研究时应作多元素的同位素分析,而其最优的选择是采用直接样品注入而不经过燃烧的测试技术。
In order to identify the sources of organic pollutants in the environment and the transformation of migration, online single stable isotope analysis (CSIA) is an essential key technology, but there are still some problems in practical application. This article evaluates the development of six on-line stationary stable isotope instruments that have been developed today, including GC-IRMS, LC-IRMS, direct introduction - Gas Chromatography - Mass Spectrometry (GC-IRMS), Gas Chromatography-Quadrupole Mass Spectrometry (GC-qMS), Gas Chromatography-Multiple Receivers Inductively Coupled Plasma Mass Spectrometry Gas Chromatography - Light Intensity Depletion Spectrometer (GC-CRDS). Five notable issues in online testing are presented: ① Preconcentration of samples; ② Gas chromatographic (GC) and liquid chromatographic (LC) separation; ③ Multiple instruments and multiple methods of choice; ④ Stabilization of organic compounds Isotope standard material development; ⑤ security. Made three recommendations: First, to develop direct injection but not through the combustion of organic pollutants isotope test techniques, such as GC-qMS and GC-CRDS technology; the second is to continue the development of GC-MC-ICPMS determination of organic chlorine and organic bromine Isotope technology; Third, rapid development of organic compounds stable isotopes of the international standard substance. This paper argues that multi-element isotope analysis should be performed on isotopic studies of monomeric compounds, and that the optimal choice is the use of direct sample injection without combustion testing techniques.