Field-Deployable, High-Resolution, Time-of-Flight Aerosol Mass Spectrometer
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- 作者：Peter F. DeCarlo ; Joel R. Kimmel ; Achim Trimborn ; Megan J. Northway ; John T. Jayne ; Allison C. Aiken ; Marc Gonin ; Katrin Fuhrer ; Thomas Horvath ; Kenneth S. Docherty ; Doug R. Worsnop ; Jose L. Jimenez
- 刊名：Analytical Chemistry
- 出版年：2006
- 出版时间：December 15, 2006
- 年：2006
- 卷：78
- 期：24
- 页码：8281 - 8289
- 全文大小：519K
- 年卷期：v.78,no.24(December 15, 2006)
- ISSN：1520-6882
文摘
The development of a new high-resolution time-of-flightaerosol mass spectrometer (HR-ToF-AMS) is reported.The high-resolution capabilities of this instrument allowthe direct separation of most ions from inorganic andorganic species at the same nominal m/z, the quantification of several types of organic fragments (CxHy, CxHyOz,CxHyNp, CxHyOzNp), and the direct identification of organicnitrogen and organosulfur content. This real-time instrument is field-deployable, and its high time resolution (0.5Hz has been demonstrated) makes it well-suited forstudies in which time resolution is critical, such as aircraftstudies. The instrument has two ion optical modes: asingle-reflection configuration offers higher sensitivity andlower resolving power (up to ~2100 at m/z 200), and atwo-reflectron configuration yields higher resolving power(up to ~4300 at m/z 200) with lower sensitivity. Theinstrument also allows the determination of the sizedistributions of all ions. One-minute detection limits forsubmicrometer aerosol are <0.04 
r.gif">g m-3 for all speciesin the high-sensitivity mode and <0.4 r.gif">g m-3 in the high-resolution mode. Examples of ambient aerosol data arepresented from the SOAR-1 study in Riverside, CA, inwhich the spectra of ambient organic species are dominated by CxHy and CxHyOz fragments, and differentorganic and inorganic fragments at the same nominal m/zshow different size distributions. Data are also presentedfrom the MIRAGE C-130 aircraft study near Mexico City,showing high correlation with independent measurementsof surrogate aerosol mass concentration.
r.gif">g m-3 for all speciesin the high-sensitivity mode and <0.4 r.gif">g m-3 in the high-resolution mode. Examples of ambient aerosol data arepresented from the SOAR-1 study in Riverside, CA, inwhich the spectra of ambient organic species are dominated by CxHy and CxHyOz fragments, and differentorganic and inorganic fragments at the same nominal m/zshow different size distributions. Data are also presentedfrom the MIRAGE C-130 aircraft study near Mexico City,showing high correlation with independent measurementsof surrogate aerosol mass concentration.