Heterogeneous ozonation kinetics of phenanthrene at the air-ice interface

被引：34

作者：

Kahan, T. F. ^{[1
]}

Donaldson, D. J. ^{[1
,2
]}

机构：

[1] Univ Toronto, Dept Chem, Toronto, ON M5S 3H6, Canada

[2] Univ Toronto, UTSC, Dept Phys & Environm Sci, Toronto, ON M5S 3H6, Canada

来源：

ENVIRONMENTAL RESEARCH LETTERS | 2008年 / 3卷 / 04期

基金：

加拿大自然科学与工程研究理事会;

关键词：

heterogeneous chemistry; kinetics; PAHs; ozone;

D O I：

10.1088/1748-9326/3/4/045006

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Phenanthrene ozonation kinetics were measured on ice at -30 and -10 degrees C, and on a water surface at 22 degrees C using glancing angle laser-induced fluorescence. A Langmuir-Hinshelwood type kinetic mechanism was observed on ice. The maximum ozonation rates were a factor of ten higher on ice than on water. No temperature dependence to the kinetics was observed between -30 and -10 degrees C, suggesting that the differences in the rates on ice and water are due to different physical properties at the two surfaces. Fluorescence spectra of phenanthrene show significant self-association on ice that is not observed on water, adding further evidence for the hypothesis that the quasi-liquid layer at the air-ice interface presents a very different environment to liquid water.

引用

页数：6

共 42 条

[1]

Adamson A.W., 1990, PHYS CHEM SURFACES, V5th ed., P777

[2] PHYSICAL ADSORPTION OF VAPORS ON ICE .I. NITROGEN [J].