Physical and Chemical Properties of 3-Methyl-1,2,3-butanetricarboxylic Acid (MBTCA) Aerosol
| Autor: | Spyros N. Pandis, Eleni Karnezi, Rafal Szmigielski, Evangelia Kostenidou, Agata Kołodziejczyk |
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| Rok vydání: | 2018 |
| Předmět: |
Aerosols
010504 meteorology & atmospheric sciences Atmosphere Chemistry Enthalpy Analytical chemistry chemistry.chemical_element General Chemistry 010501 environmental sciences Mass spectrometry 01 natural sciences Oxygen Aerosol Fragmentation (mass spectrometry) Scanning mobility particle sizer Vaporization Monoterpenes Environmental Chemistry Organic Chemicals Volatilization Particle density 0105 earth and related environmental sciences |
| Zdroj: | Environmental Science & Technology. 52:1150-1155 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/acs.est.7b04348 |
| Popis: | The properties and the chemical fate of later generation products of the oxidation of biogenic organic compounds are mostly unknown. The properties of fresh MBTCA aerosol, a later generation product of the oxidation of monoterpenes in the atmosphere, were determined combining an aerosol mass spectrometer (AMS), a thermodenuder, and a scanning mobility particle sizer. Based on its AMS spectrum m/z 141.055 (C7H9O3+) could be used as an MBTCA signature. The MBTCA particle density was 1.43 ± 0.04 g cm–3, its saturation concentration was (1.8 ± 1.3) × 10–3 μg m–3 at 298 K, and its vaporization enthalpy was 150 ± 15 kJ mol–1. After OH radical exposure (∼1.2 days) and UV illumination the average aerosol O:C ratio decreased from 0.72 to 0.58–0.64 suggesting net fragmentation. Our findings suggest that the reactions of MBTCA with OH lead to CO2 loss with or without an oxygen addition. |
| Databáze: | OpenAIRE |
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