Use of a refluxing mist chamber for measurement of gas-phase mercury(II) species in the atmosphere |
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| Authors: | W J Stratton S E Lindberg |
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| Institution: | 1. Department of Chemistry, Earlham College, 47374, Richmond, IN
2. Environmental Sciences Division, Oak Ridge National Laboratory, 37830, Oak Ridge, TN
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| Abstract: | As part of current efforts to understand the cycling of mercury (Hg) in the atmosphere, information is needed on its atmospheric speciation. Almost no data exists on water-soluble Hg(II) species in ambient air. A new technique for measuring gas phase water soluble Hg(II) species has been developed, utilizing a high-flow refluxing mist chamber. Extensive testing has been carried out, including attempts to rule out production of artifact Hg(II). Measurements at two locations (East-Central Tennessee and the Ohio-Indiana border) found approximately 0.05–0.15 ng/m3 of reactive Hg(II), representing ca. 3 to 5% of the total gaseous Hg. Limited tests of artifact Hg(II) production in the mist chamber by ozone oxidation and co-sampled aerosol Hg(II) suggest that the majority of the collected Hg(II) exists in ambient air in the gas phase. |
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