World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Hydroxyl Radical Reactivity at the Air-ice Interface : Volume 9, Issue 5 (05/10/2009)

By Kahan, T. F.

Click here to view

Book Id: WPLBN0003980942
Format Type: PDF Article :
File Size: Pages 31
Reproduction Date: 2015

Title: Hydroxyl Radical Reactivity at the Air-ice Interface : Volume 9, Issue 5 (05/10/2009)  
Author: Kahan, T. F.
Volume: Vol. 9, Issue 5
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Donaldson, D. J., Zhao, R., & Kahan, T. F. (2009). Hydroxyl Radical Reactivity at the Air-ice Interface : Volume 9, Issue 5 (05/10/2009). Retrieved from http://comicbooklibrary.org/


Description
Description: Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, M5S 3H6 Ontario, Canada. Hydroxyl radicals are important oxidants in the atmosphere and in natural waters. They are also expected to be important in snow and ice, but their reactivity has not been widely studied in frozen aqueous solution. We have developed a spectroscopic probe to monitor the formation and reactions of hydroxyl radicals in situ. Hydroxyl radicals are produced in aqueous solution via the photolysis of nitrite, nitrate, and hydrogen peroxide, and react rapidly with benzene to form phenol. Similar phenol formation rates were observed in aqueous solution and bulk ice. However, no reaction was observed at the air-ice interface, or when bulk ice samples were crushed prior to photolysis to increase their surface area. We also monitored the heterogeneous reaction between benzene present at air-water and air-ice interfaces with gas-phase OH produced from HONO photolysis. Rapid phenol formation was observed on water surfaces, but no reaction was observed at the surface of ice. Under the same conditions, we observed rapid loss of the polycyclic aromatic hydrocarbon (PAH) anthracene at the air-water interface, but no loss was observed at the air-ice interface. Our results suggest that the reactivity of hydroxyl radicals toward aromatic organics is similar in bulk ice samples and in aqueous solution, but is significantly suppressed in the quasi-liquid layer (QLL) that exists at the air-ice interface.

Summary
Hydroxyl radical reactivity at the air-ice interface

Excerpt
Anastasio, C. and Chu, L.: Photochemistry of Nitrous Acid (HONO) and Nitrous Acidium Ion (H2ONO+) in Aqueous Solution and Ice, Environ. Sci. Technol., 43, 1108–1114, 2009.; Ardura, D., Kahan, T. F., and Donaldson, D. J.: Self-association of naphthalene at the air-ice interface, J. Phys. Chem., 113, 7353–7359, 2009.; Anastasio, C., Galbavy, E. S., Hutterli, M. A., Burkhart, J. F., and Friel, D. K.: Photoformation of hydroxyl radical on snow grains at Summit, Greenland, Atmos. Environ., 41, 5110–5121, 2007.; Aubin, D. G. and Abbatt, J. P. D.: Interaction of NO2 with hydrocarbon soot: Focus on HONO yield, surface modification, and mechanism, J. Phys. Chem., 111, 6263–6273, 2007.; Carrera, G., Fernandez, P., Vilanova, R. M., and Grimalt, J. O.: Persistent organic pollutants in snow from European high mountain areas, Atmos. Environ., 35, 245–254, 2001.; Chu, L. and Anastasio, C.: Quantum yields of hydroxyl radical and nitrogen dioxide from the photolysis of nitrate on ice, J. Phys. Chem., 107, 9594–9602, 2003.; Chu, L. and Anastasio, C.: Formation of hydroxyl radical from the photolysis of frozen hydrogen peroxide, J. Phys. Chem., 109, 6264–6271, 2005.; Chu, L. and Anastasio, C.: Temperature and wavelength dependence of nitrite photolysis in frozen and aqueous solutions, Environ. Sci. Technol., 41, 3626–3632, 2007.; Cincinelli, A., Stortini, A. M., Checchini, L., Martellini, T., Del Bubba, M., and Lepri, L.: Enrichment of organic pollutants in the sea surface microlayer (SML) at Terra Nova Bay, Antarctica: influence of SML on superfacial snow composition, J. Environ. Monit., 7, 1305–1312, 2005.; Clifford, D., T. Bartels-Rausch and D. J. Donaldson: Suppression of aqueous surface hydrolysis by monolayers of short chain organic amphiphiles, Phys. Chem. Chem. Phys., 2007.; Compoint, M., Toubin, C., Picaud, S., Hoang, P. N. M., and Girardet, C.: Geometry and dynamics of formic and acetic acids adsorbed on ice, Chem. Phys. Lett., 365, 1–7, 2002.; Cotter, E. S. N., Jones, A. E., Wolff, E. W., and Bauguitte, S. J.-B.: What controls photochemical NO and NO2 production from Antarctic snow? Laboratory investigation assessing the wavelength and temperature dependence, J. Geophys. Res., 108, 8-1–8-10, 2003.; Daly, G. L. and Wania, F.: Organic contaminants in mountains, Environ. Sci. Technol., 39, 385–398, 2005.; Domine, F., Albert, M., Huthwelker, T., Jacobi, H. W., Kokhanovsky, A. A., Lehning, M., Picard, G., and Simpson, W. R.: Snow physics as relevant to snow photochemistry, Atmos. Chem. Phys., 8, 171–208, 2008.; Domine, F. and Shepson, P. B.: Air-snow interactions and atmospheric chemistry, Science, 297, 1506–1510, 2002.; Dubowski, Y., Colussi, A. J., Boxe, C., and Hoffmann, M. R.: Monotonic increase of nitrite yields in the photolysis of nitrate in ice and water between 238 and 294 K, J. Phys. Chem., 106, 6967–6971, 2002.; Dubowski, Y., Colussi, A. J., and Hoffmann, M. R.: Nitrogen dioxide release in the 302 nm band photolysis of spray-frozen aqueous nitrate solutions. Atmospheric implications, J. Phys. Chem., 105, 4928–4932, 2001.; Dubowski, Y. and Hoffmann, M. R.: Photochemical transformations in ice: Implications for the fate of chemical species, Geophys. Res. Lett., 27, 3321–3324, 2000.; Febo, A., Perrino, C., Gherardi, M., and Sparapani, R.: Evaluation of a High-Purity and High-Stability Continuous Generation System for Nitrous-Acid, Environ. Sci. Technol., 29, 2390–2395, 1995.; Fernandez, P., Carrera, G., Grimalt, J. O., Ventura, M., Camarero, L., Catalan, J., Nickus, U., Thies, H., and Psenner, R.: Factors governing the atmospheric deposition of polycyclic aromatic hydrocarbons to remote areas, Environ. Sci. Technol., 37, 3261–3267, 2003.; Grannas, A. M., Bausch, A. R., and Mahanna, K. M.: Enhanced aqueous photochemical reaction rates after freezing, J. Phys. Chem., 111, 11043–11049, 2007.; Franz, T. P. and Eisenreich, S. J.: Accumulation of polychlorinated biphenyls and polycyclic aromatic hydrocarbons in t

 
 



Copyright © World Library Foundation. All rights reserved. eBooks from Comic eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.