A KINETIC-STUDY OF THE REACTIONS OF OH WITH CH3I AND CF3I

被引：35

作者：

BROWN, AC

CANOSAMAS, CE

WAYNE, RP

机构：

[1] Physical Chemistry Laboratory, Oxford, OX1 3QZ, South Parks Road

来源：

ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS | 1990年 / 24卷 / 02期

关键词：

hydroxyl radical; Methyl iodide; reaction kinetics; troposphere;

D O I：

10.1016/0960-1686(90)90115-4

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A discharge-flow resonance-fluorescence technique was used to study the rates of the reactions CH3I + OH → products (1) CF3I + OH → CF3 + HOI. (2) Reaction (1) was studied in the temperature range 271-423 K, and Reaction (2) was investigated at 298 K. The rate constant for Reaction (1) at room temperature is (7.2 ± 0.7) × 10-14 cm3 molecule-1 s-1. The activation energy, Ea, for Reaction (1) is (9.3 ± 1.7) kJ mol-1. The rate constant for Reaction (2) at room temperature is (3.1 ± 0.5) × 10-14 cm3 molecule-1 s-1. No pressure dependence for either reaction was found over the pressure range 1.7-5.0 mmHg. For a typical tropospheric concentration of OH of 7.7 × 105 molecule cm-3, hydroxyl radical scavenging of CH3I accounts for only a 2% loss of CH3I compared with photolysis. © 1990.

引用

页码：361 / 367

页数：7

共 35 条

[1] FTIR STUDY OF THE DMS/NO2/I2/N2 PHOTOLYSIS SYSTEM - THE REACTION OF IO RADICALS WITH DMS [J].