Physical and Chemical Properties of 3-Methyl-1,2,3-butanetricarboxylic Acid (MBTCA) Aerosol.
Environ Sci Technol
; 52(3): 1150-1155, 2018 02 06.
Article
em En
| MEDLINE
| ID: mdl-29286656
ABSTRACT
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 (â¼1.2 days) and UV illumination the average aerosol OC 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.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Compostos Orgânicos
/
Atmosfera
Idioma:
En
Revista:
Environ Sci Technol
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Grécia