Event Title

Thermal and Photochemical Reactions of HONO/ NO2: pH Effects

Graduation Year

2013

Location

Atrium, Center for Natural Sciences, Illinois Wesleyan University

Start Date

20-4-2013 2:00 PM

End Date

20-4-2013 3:00 PM

Description

Nitrous acid and nitrite ion naturally occur in the environment and react with light to form hydroxyl radicals, a key ingredient in pollution studies. HONO and NO2are in equilibrium with each other, and their separate contributions to the production of hydroxyl radicals are not certain. In this study, UV-Vis spectrometry was used to determine the absorbance values of NO2and HONO under basic and acidic conditions, respectively. The order of the thermolysis reaction of HONO (~2.4) was also determined by using the absorbance values over time. Current work is focused on the photolysis of both species in the near UV (366 nm) and the use of a hydroxyl radical scavenger to better judge the relative rates of photolytic production of hydroxyl radicals from HONO and NO2at varying pH values.

This document is currently not available here.

Share

COinS
 
Apr 20th, 2:00 PM Apr 20th, 3:00 PM

Thermal and Photochemical Reactions of HONO/ NO2: pH Effects

Atrium, Center for Natural Sciences, Illinois Wesleyan University

Nitrous acid and nitrite ion naturally occur in the environment and react with light to form hydroxyl radicals, a key ingredient in pollution studies. HONO and NO2are in equilibrium with each other, and their separate contributions to the production of hydroxyl radicals are not certain. In this study, UV-Vis spectrometry was used to determine the absorbance values of NO2and HONO under basic and acidic conditions, respectively. The order of the thermolysis reaction of HONO (~2.4) was also determined by using the absorbance values over time. Current work is focused on the photolysis of both species in the near UV (366 nm) and the use of a hydroxyl radical scavenger to better judge the relative rates of photolytic production of hydroxyl radicals from HONO and NO2at varying pH values.