Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 6 1 2006 10.5194/acpd-6-941-2006 http://www.atmos-chem-phys-discuss.net/6/941/2006/ http://www.atmos-chem-phys-discuss.net/6/941/2006/acpd-6-941-2006.html http://www.atmos-chem-phys-discuss.net/6/941/2006/acpd-6-941-2006.pdf 941 979 2006-02-02 A chemical probe technique for the determination of reactive halogen species in aqueous solution: Part 2 – chloride solutions and mixed bromide/chloride solutions C. Anastasio B. M. Matthew Atmospheric Science Program, Department of Land, Air & Water Resources, University of California, Davis, USA now at: Hach Company, Loveland, Colorado, USA Although reactive halogen species (X*=X^●, ^●X₂^−, X₂ and HOX, where X=Br, Cl, or I) are important environmental oxidants, relatively little is known about their kinetics in condensed phases such as seawater and sea-salt particles. Here we describe a new technique to determine reactive chlorine and bromine species in aqueous solutions by using allyl alcohol (CH₂=CHCH₂OH) as a chemical probe. This probe is combined with competition kinetics in order to determine steady state concentrations of X*(aq). In some cases the technique also can be used to determine the rates of formation and lifetimes of X* in aqueous solution. In a companion paper we reported the results of our method development for aqueous solutions containing only bromide (Br^−). In this paper, we discuss method development for solutions containing chloride (Cl^−) alone, and for solutions containing both bromide and chloride.