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Metilación de cloruro por pectina vegetal: un proceso eficiente y significativo desde el punto de vista ambiental
John T G Hamilton1, W Colin McRoberts, Frank Keppler
1Department of Agriculture and Rural Development for Northern Ireland, Newforge Lane, Belfast BT9 5PX, UK. jack.hamilton@dardni.gov.uk
Science (New York, N.Y.)
|July 12, 2003
Resumen
Un mecanismo abiótico común convierte fácilmente el cloruro en clorometano (CH3Cl) en el material vegetal, particularmente en la pectina. Este proceso, significativo en los ecosistemas terrestres y la quema de biomasa, probablemente representa la mayor parte del CH3Cl. atmosférico.
Área de la Ciencia:
- Química del medio ambiente Química del medio ambiente
- Biogeoquímica La biogeoquímica es la bioquímica.
- Ciencias de la atmósfera Ciencias atmosféricas.
Sus antecedentes:
- El clorometano atmosférico (CH3Cl) es un actor clave en el agotamiento de la capa de ozono estratosférica.
- Sigue habiendo incertidumbres significativas con respecto a las fuentes, sumideros y procesos de formación de CH3Cl.
- Comprender la generación natural de CH3Cl es crucial para el modelado atmosférico.
Objetivo del estudio:
- Identificar y caracterizar un mecanismo común para la producción de CH3Cl en entornos terrestres.
- Para investigar el papel del material vegetal y la pectina en la síntesis de CH3Cl.
- Para cuantificar las emisiones de CH3Cl de la materia vegetal bajo temperaturas variables.
Principales métodos:
- Investigación experimental de la conversión abiótica del cloruro en CH3Cl en el material vegetal.
- Utilizando la pectina como donante de metilo en la reacción.
- Medición de las emisiones de CH3Cl de hojas senescentes y muertas a temperaturas ambientales y elevadas.
Principales resultados:
- Se observó que la conversión abiótica del cloruro en CH3Cl ocurre fácilmente en el material vegetal.
- La pectina fue identificada como un componente clave que actúa como donante de metilo.
- Se detectaron emisiones significativas de CH3Cl de hojas senescentes y muertas, aumentando con la temperatura.
Conclusiones:
- Un proceso abiótico ubicuo en los ecosistemas terrestres genera CH3Cl.
- Este mecanismo mediado por la pectina, activo en la materia vegetal y durante la quema de biomasa, probablemente contribuye con la mayoría del CH3Cl atmosférico.
- La investigación adicional en esta vía es esencial para las evaluaciones precisas de la química atmosférica y la capa de ozono.
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