1. Главная
  2. Ресурсы
  3. Библиотечный поиск
Seasonal variation ofhigh‐molecular‐weightcompounds in thewater‐solublefraction of organicurban aerosols Vera SamburovaSönke SzidatChristoph Hueglin2005 год

Seasonal variation of high‐molecular‐weight compounds in the water‐soluble fraction of organic urban aerosols
статья из журнала

Полный текстСтраница публикацииПубликация в OpenAlex
Аннотация: Aerosol samples were collected in Zurich, Switzerland, at an urban background site and were analyzed with size exclusion chromatography (SEC) and laser/desorption ionization mass spectrometry (LDI‐MS) for water‐soluble organic compounds with high molecular weight. Daily samples were collected during two campaigns in winter and summer, for 1 month each. The concentration of high‐molecular‐weight compounds (humic‐like substances (HULIS)) was between 0.4 and 4 μg/m 3 in winter and summer. The most intense signals in the LDI‐MS mass spectra were measured between m/z150 and 500, comparing well with the mode of the two main high mass peaks determined with SEC corresponding to masses between 200 and 600 Da. For the maximum molecular weight, however, different results were obtained by the two techniques: whereas a maximum molecular weight between 1300 and 3300 Da was found with SEC, hardly any peaks above m/z700 were measured with LDI‐MS. During summer the maximum molecular weight of HULIS (determined with SEC) correlates positively with several parameters such as ozone and increased temperature indicative of enhanced atmospheric photo‐oxidation. The HULIS concentration also correlates positively with the oxalic acid concentration in the particles. This suggests that HULIS are generated by secondary processes in summer. The lack of such correlations during winter suggests that other sources and processes might be important during colder seasons.
Год издания: 2005
Авторы: Vera Samburova, Sönke Szidat, Christoph Hueglin, R. Fisseha, Urs Baltensperger, Renato Zenobi, Markus Kalberer
Издательство: American Geophysical Union
Источник: Journal of Geophysical Research Atmospheres
Ключевые слова: Atmospheric chemistry and aerosols, Atmospheric Ozone and Climate, Atmospheric and Environmental Gas Dynamics
Другие ссылки: Journal of Geophysical Research Atmospheres (PDF)
Journal of Geophysical Research Atmospheres (HTML)
Bern Open Repository and Information System (University of Bern) (PDF)
Bern Open Repository and Information System (University of Bern) (HTML)
DORA Empa (Swiss Federal Laboratories for Materials Science and Technology (Empa)) (PDF)
DORA Empa (Swiss Federal Laboratories for Materials Science and Technology (Empa)) (HTML)
DORA PSI (Paul Scherrer Institute) (PDF)
DORA PSI (Paul Scherrer Institute) (HTML)