에어로솔 내 개별 유기성분들의 분석을 위한 열탈착 (Thermal desorption)과 기체크로마토그래피-질량분석기 (GC-MS)기법 개발 및 적용

Abstract

Airborne particulate matter (PM) has adverse effects on human morbidity and mortality, visibility reduction, and climate change. These effects have sparked interest in the chemical and physical properties of PM, with increasing interest in its organic matter (OM) composition. Large numbers of samples are needed to relate ambient carbonaceous materials to assess their environmental and health adverse effects. This demands fast, simple, and sensitive analytical methods. In this study, internal thermal desorption (TD) system coupled with gas chromatography-mass spectrometry (GC-MS) was developed to reduce labor- and time-consuming work for OM analysis. Various organic compounds such as PAHs, n-Alkanes, hopanes and steranes in the samples were analyzed and QA/QC data such as LOD, recovery and reproducibility were evaluated using internal TD-GC-MS system developed in this study. Based on the results of QA/QC and ambient samples, we concluded that internal TD-GC-MS is suitable method to analyze organic compounds in PM. Also, internal TD-GC-MS required sample preparation time as ∼10 min and compared to SE-GC-MS, sample preparation time was reduced to 1/40. Next, GC×GC system was applied to TD system to improve separation of organic compouns in the PM samples, Time Of Flight Mass Spectrometry (TOFMS) is one of the acceptable mass spectrometry to supply mass spectral data of all separated compounds to in GC×GC system. In this study, we installed external TD to GC×GC-TOFMS system and provided all the parameters of TD, GC×GC and TOFMS. Then, PM samples was applied to this system to analyze various organic compounds, especially, fossil fuel originated organic compounds such as PAHs, n-Alkanes, hopanes and steranes. Before applying the PM samples, QA/QC as were performed to evaluate the acceptance of these compounds. Enhanced separations results for PM samples were shown in GC×GC chromatogram and accurate mass spectrum for all separated compounds was provided by TOFMS. By applying external TD-GC×GC-TOFMS and comparing organic compounds distributions in PM samples, the impact of fossil fuel originated organic pollutants at background site and urban site were evaluated.