کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4453050 | 1312127 | 2009 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Characterization of the volatile fraction of laboratory-generated aerosol particles by thermodenuder-aerosol mass spectrometer coupling experiments
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علم هواشناسی
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![عکس صفحه اول مقاله: Characterization of the volatile fraction of laboratory-generated aerosol particles by thermodenuder-aerosol mass spectrometer coupling experiments Characterization of the volatile fraction of laboratory-generated aerosol particles by thermodenuder-aerosol mass spectrometer coupling experiments](/preview/png/4453050.png)
چکیده انگلیسی
An aerodyne high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) combined with a thermodenuder (TD) was used to investigate laboratory-generated aerosol particles with regard to their volatility and chemical content. The performance of the setup was tested first by using ammonium sulfate particles. Organic compounds have been measured including humic acid, fulvic acid, succinic acid and its disodium salt, 2-methylsuccinic acid, fumaric acid, α-ketoglutaric acid, and glutaric acid. Among them, humic acid, fulvic acid, and disodium succinate show a non-volatile fraction at 300 °C, while the other organic compounds are more volatile. Comparisons of mass spectra at different temperatures showed that significant differences in mass spectra of humic and fulvic acids are observed, indicating that their molecules changed during or after volatilization. At lower temperatures, the changes in humic acid are more likely due to the evaporation of small organic molecules or decomposition of aliphatic groups. The mass losses of the CO2+ fragment for both humic and fulvic acids at higher temperatures may arise from decarboxylation processes. The different mass spectra for humic and fulvic acids before and after TD also suggest that one should be careful in interpretation of volatility measurements because some molecule structures may change after being heated, especially for the non-volatile multifunctional compounds.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Aerosol Science - Volume 40, Issue 7, July 2009, Pages 603-612
Journal: Journal of Aerosol Science - Volume 40, Issue 7, July 2009, Pages 603-612
نویسندگان
Zhijun Wu, Laurent Poulain, Birgit Wehner, Alfred Wiedensohler, Hartmut Herrmann,