A chemical probe technique for the determination of reactive halogen species in aqueous solution: Part 1 – bromide solutions B. M. Matthew1,* and C. Anastasio1 1Atmospheric Science Program, Department of Land, Air & Water Resources, University of California, Davis, USA *now at: Hach Company, Loveland, Colorado, USA
Abstract. Reactive halogen species (X*=X•, •X2-,
X2 and HOX, where X=Br, Cl, or I) in seawater, sea-salt particles,
and snowpacks play important roles in the chemistry of the marine boundary
layer. Despite this, relatively little is known about the steady-state
concentrations or kinetics of reactive halogens in these environmental
samples. In part this is because there are few instruments or techniques
that can be used to characterize aqueous reactive halogens. To better
understand this chemistry, we have developed a chemical probe technique that
can detect and quantify aqueous reactive bromine and chlorine species
(Br*(aq) and Cl*(aq)). This technique is based on the reactions of
short-lived X*(aq) species with allyl alcohol (CH2=CHCH2OH) to
form stable 3-halo-1,2-propanediols that are analyzed by gas chromatography.
Using this technique in conjunction with competition kinetics allows
determination of the steady state concentrations of the aqueous reactive
halogens and, in some cases, the rates of formation and lifetimes of X* in
aqueous solutions. We report here the results of the method development for
aqueous solutions containing only bromide (Br-).
Citation: Matthew, B. M. and Anastasio, C.: A chemical probe technique for the determination of reactive halogen species in aqueous solution: Part 1 – bromide solutions, Atmos. Chem. Phys., 6, 2423-2437, doi:10.5194/acp-6-2423-2006, 2006.