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El ion disulfato como intermediario del ácido sulfúrico en la formación de lluvia ácida
Science (New York, N.Y.)
|August 14, 1987
Resumen
Un nuevo intermediario, probablemente el ion disulfato, se forma durante la oxidación del bisulfito por el oxígeno. Este intermedio, detectado a través de la espectroscopia de Raman, tiene una vida media corta antes de hidrolizarse en productos sulfatados.
Área de la Ciencia:
- Química Química es la química.
- Ciencias del medio ambiente Ciencias del medio ambiente.
- La espectroscopia es una técnica de espectroscopia.
Sus antecedentes:
- La oxidación de iones bisulfito (HSO3-) por el oxígeno disuelto es crucial en los procesos ambientales e industriales.
- Se sabe que esta reacción produce iones sulfato (SO42-), pero el mecanismo de reacción y los productos intermedios no se han aclarado completamente.
- Comprender las especies intermedias es clave para controlar las tasas de reacción y los subproductos.
Objetivo del estudio:
- Para identificar y caracterizar el intermedio no detectado previamente formado durante la oxidación del bisulfito por el oxígeno disuelto.
- Para aclarar la estructura química y las propiedades de esta especie intermedia.
- Para determinar la vía de hidrólisis y la cinética del intermedio.
Principales métodos:
- Utilizó la espectroscopia Raman para detectar y analizar las especies intermedias.
- Se observaron bandas de Raman características a 1090 cm-1 (fuertes) y 740 cm-1 (débiles), indicativas de extensiones de azufre y oxígeno.
- Investigó la cinética de hidrólisis del intermedio en condiciones controladas.
Principales resultados:
- Se identificó un intermedio transitorio con distintas características espectrales de Raman.
- El intermedio exhibe una fuerte banda de Raman a 1090 cm-1 y una banda débil a 740 cm-1.
- Se propone que el intermediario sea el ion disulfato (S2O72-).
- Determinada la hidrólisis del ion disulfato produce H+ y ya sea sulfato (SO42-) o bisulfato (HSO42-) iones.
- Se midió una vida media de aproximadamente 52 segundos para el intermedio a 25°C.
Conclusiones:
- La oxidación del bisulfito por el oxígeno disuelto procede a través de un intermediario de iones disulfato.
- La espectroscopia Raman es una herramienta eficaz para detectar esta especie transitorio de azufre y oxígeno.
- El intermedio disulfato es relativamente inestable, se hidroliza rápidamente para formar iones sulfato y bisulfato.
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