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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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2013
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Concerns on the production, use and occurences in the environment of nanomaterial are increasing. Fast determination of nanomaterial from various environmental matrices are requiring to understand their fates in water, soil and biological tissues. In this study, ambient ionization technique with mass spectrometry was used as a fast identification tools for fullerenes C 60 , C 72 C 84 and single (SW), double (DW), multi (MW) wall carbon nanotubes (CNTs). For this performance, direct analysis in real time (DART) with Orbitrap high resolution mass spectrometer was applied. For DART, optimized condition for ionization temperature and time were set at 400~500oC and 1 min. Resolution, mass scan range and accuracy of Orbitrap MS were operated at 50,000,100~1,100 amu and 5 ppm, calculated parts per million unit of monoisotope, respectively. Standard fullerene C 60 , C 72 and C 84 were successfully ionized by DART source at high temperature. Molecular and their isotopes were detected with high mass accuracy for 0.55~1.77 ppm. Fullerenes were not found in sludge samples from drinking water treatment plants. For CNTs, specific m/z ions were not differentiated among SW, DW and MW-CNT standards and 36 sludges. After background mass removal, major 60 m/z ions were used for statistical analysis. Cluster between SW, DW, MW-CNT standard and sludges were separated in principal component analysis (PCA). Further, scanning electron microscopy (SEM) was used to supplement the qualitative method above. There was no similarities between CNT standard samples and sludges. This methodology suggesting very fast and accurate ionization and identification method for carbon nano-materials. Further, this is the first report of desorption ionization technique to carbon nanotube analysis for identification.
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