Experimental Study for the Identification of the Nascent Product of OH Heterogeneous Reaction with NaCl using Chemical Ionization Mass Spectrometry

J.h Park ,Mario J Molina,А В Иванов

doi:10.5478/msl.2012.3.4.108

Abstract

An experimental study on the nascent product of the OH heterogeneous reaction with NaCl was performed under dryand wet conditions using a bead-filled flow tube system coupled to a high-pressure chemical ionization mass spectrometer. Theozone concentration in the flow tube for the atomic hydrogen removal was varied in order to control the conversion reaction ofmolecular chlorine into HCl for the identification of the nascent product. The mass spectrometric observation was that the O3introduction reduced the concentration HCl, while it increased the concentration of Cl2 and ClO. Based on the experimentalresults, we suggest that the nascent product of the titled reaction is gaseous Cl2, which is followed by fast conversion into HCl inpresence of H. No significant difference in the concentration profile between under dry and wet (RH = 2%) conditions wasobserved.

Highlights

As a key oxidant, the hydroxyl radical (OH) is involved in a variety of reactions in the atmosphere
Recently it is reported that the heterogeneous reaction of OH with sea-salt is enhanced under wet conditions,[5,6] which is a probable case in the coastal area
*Reprint requests to Dr Jong-Ho Park E-mail: jongho@kaeri.re.kr we observed chlorine-containing ions, which are HClF- (55 amu) and SF5Cl− (162 amu), in the flow tube study on the OH heterogeneous reaction with NaCl using chemical ionization mass spectrometry (CIMS)

Summary

Introduction

The hydroxyl radical (OH) is involved in a variety of reactions in the atmosphere. *Reprint requests to Dr Jong-Ho Park E-mail: jongho@kaeri.re.kr we observed chlorine-containing ions, which are HClF- (55 amu) and SF5Cl− (162 amu), in the flow tube study on the OH heterogeneous reaction with NaCl using chemical ionization mass spectrometry (CIMS).

Results

Conclusion