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El potencial de formación de aerosoles atmosféricos del vapor de gasolina entera es el potencial de formación de
J R Odum1, T P Jungkamp, R J Griffin
1Department of Environmental Engineering Science, California Institute of Technology, Pasadena 91125, USA.
Science (New York, N.Y.)
|April 4, 1997
Resumen
Los experimentos con cámaras de smog irradiadas por la luz solar muestran que los compuestos aromáticos en el vapor de gasolina son los únicos responsables de la formación de aerosoles orgánicos atmosféricos. Este hallazgo permite un mejor modelado de la producción secundaria de aerosoles orgánicos a partir de perfiles de hidrocarburos urbanos.
Área de la Ciencia:
- Química de la atmósfera La química de la atmósfera
- Ciencias ambientales Ciencias ambientales.
- Química orgánica es la química orgánica.
Sus antecedentes:
- Los aerosoles orgánicos atmosféricos tienen un impacto significativo en la calidad del aire y el clima.
- La combustión de la gasolina es una fuente importante de hidrocarburos antropogénicos en entornos urbanos.
- Comprender la formación de aerosoles a partir de componentes específicos del combustible es crucial para el modelado atmosférico.
Objetivo del estudio:
- Determinar los componentes específicos del vapor de gasolina responsables de la formación de aerosoles orgánicos secundarios (SOA, por sus siglas en inglés).
- Evaluar el potencial para modelar la formación de SOA atmosférico utilizando la composición de vapor de gasolina.
- Para investigar la relación entre la composición del combustible y la producción de aerosoles.
Principales métodos:
- Se llevaron a cabo experimentos con cámaras de smog irradiadas por la luz solar.
- Se analizó la formación de aerosoles orgánicos a partir del vapor de gasolina entera.
- Se cuantificó la contribución de la fracción aromática de la gasolina a la formación de aerosoles.
Principales resultados:
- El potencial de formación de aerosoles orgánicos atmosféricos del vapor de gasolina entera es únicamente atribuible a su fracción aromática.
- La producción secundaria de aerosoles orgánicos a partir de la oxidación del vapor de gasolina es la suma de las contribuciones moleculares aromáticas individuales.
- La gasolina entera evaporada se aproxima con precisión a los perfiles de hidrocarburos antropogénicos urbanos.
Conclusiones:
- Los compuestos aromáticos en la gasolina son los principales impulsores de la formación de aerosoles orgánicos secundarios.
- La formación de aerosoles orgánicos secundarios atmosféricos puede modelarse eficazmente considerando los constituyentes aromáticos de los combustibles.
- Estos hallazgos proporcionan un camino para mejorar los modelos de calidad del aire.
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