Estimation of hydroxyl and hydroperoxyl radicals concentrations in the urban atmosphere of santiago

  1. M. Angélica Rubio 1
  2. Eduardo Liss 1
  3. Guillermo Villena 1
  4. Victoria Caroca 1
  5. Ernesto Gramsch 2
  6. Álvaro Ruiz 1
  1. 1 Universidad de Santiago de Chile Facultad de Química y Biología Dpto. Ciencias Químicas
  2. 2 Universidad de Santiago de Chile Facultad de Ciencias Dpto. Física
Revista:
Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química)

Año de publicación: 2005

Volumen: 50

Número: 2

Páginas: 471-476

Tipo: Artículo

DOI: 10.4067/S0717-97072005000200006 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Objetivos de desarrollo sostenible

Resumen

Photochemical smog episodes are frequent in Santiago of Chile city. We have measured the concentration of the main free radical precursors (formaldehyde, ozone, nitrogen dioxide, peroxyacetyl nitrate and nitrous acid), nitrogen monoxide and the irradiance. Calculations of the rate of OH* production were performed for different periods of the year and at emission (Cerrillos and Estacion Central) and receptor sites (Las Condes). From these data and simple steady state considerations were derived the concentrations of hydroxyl and hydroperoxyl radicals. Daily profiles of both radicals show a noticeable accumulation during early afternoon, the time of most intense oxidants accumulation. During summer time, hydroperoxyl radical concentrations are higher in Las Condes than in Cerrillos. The concentrations calculated for both radicals are higher than those estimated in other cities, suggesting a particularly high photochemical activity in the urban atmosphere of Santiago of Chile

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