%0 Journal Article
%T Experimental Determination of the Photooxidation of Aqueous I每 as a Source of Atmospheric I2
%J -
%D 2019
%R https://doi.org/10.1021/acsearthspacechem.9b00007
%X The chemistry of iodine plays an important role in the oxidizing capacity of the global marine atmosphere. In this study, we experimentally determine the photooxidation parameters of iodide ions in aqueous phase (I每(aq)) and estimate the subsequent emission of gaseous iodine molecules (I2(g)) into the atmosphere. The values of the molar absorption coefficient (汍iodide(竹)) and the photooxidative quantum yields (朴iodide(竹)) of I每(aq) in the range of 290每500 nm were determined. The influence of pH and dissolved oxygen (DO) on the values of 朴iodide(竹) was also investigated. The emission of I2(g) into the atmosphere following the photooxidation of I每(aq) in deionized water solution (pH 5.6, DO 7.8 mg L每1) and artificial seawater solution (pH 8.0, DO 7.0 mg L每1) was estimated to be (2.2 ℅ 10每8 ℅ [I每(aq)]sea) and (1.8 ℅ 10每8 ℅ [I每(aq)]sea) mol L每1 s每1, respectively. Using a global chemistry-climate model, we estimated that the photooxidation of I每(aq) can increase the atmospheric iodine budget by up to ‵8% over some oceanic regions
%U https://pubs.acs.org/doi/10.1021/acsearthspacechem.9b00007