Interactive comment on “Bromine Speciation in Volcanic Plumes: New in-situ Derivatization LC-MS Method for the Determination of Gaseous Hydrogen Bromide by Gas Diffusion Denuder Sampling” by Alexandra Gutmann et al

While the manuscript would be improved greatly by a characterization of the sensitivity and dynamic range of this technique, the authors do demonstrate the technique is selective for HBr and that the fraction of HBr/(Total Bromine) can be obtained as a function of distance from the emission source which is a helpful quantity even if substantial uncertainties remain as to the actual amount of HBr measured.