222Rn calibrated mercury fluxes from terrestrial surfaces of southern Africa 
derived from observations at Cape Point, South Africa

Slemr, F.; Brunke, E. G.; Whittlestone, S.; Zahorowski, W.; Ebinghaus, R.; Kock, H. H.; Labuschagne, C.

doi:10.1051/e3sconf/20130117005

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²²²Rn calibrated mercury fluxes from terrestrial surfaces of southern Africa derived from observations at Cape Point, South Africa

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Slemr, F.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Slemr, F., Brunke, E. G., Whittlestone, S., Zahorowski, W., Ebinghaus, R., Kock, H. H., et al. (2013). ²²²Rn calibrated mercury fluxes from terrestrial surfaces of southern Africa derived from observations at Cape Point, South Africa. In N. Pirrone (Ed.), E3S Web of Conferences, Volume 1: Proceedings of the 16th International Conference on Heavy Metals in the Environment.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-89BD-4

Abstract

Gaseous elemental mercury (GEM) and Rn-222, a radioactive gas of primarily terrestrial origin with a half-life of 3.8 days, have been measured simultaneously at Cape Point, South Africa, since March 2007. Between March 2007 and December 2009 altogether 59 events with high Rn-222 concentrations were identified. GEM correlated with Rn-222 in 41 of the events and was constant during the remaining events without significant correlation. The average GEM/Rn-222 emission ratio of all events was -0.0047 +/- 0.0054 pg mBq(-1), with +/- 0.0054 being the standard error of the average. With an emission rate of 1.1 Rn-222 atoms cm(-2) s(-1) and a correction for the transport duration, this emission ratio corresponds to a radon calibrated flux of about -0.53 +/- 0.62 ng m(-2) h(-1) which is statistically not distinguishable from zero. With wet deposition, which is not included in this estimate, the terrestrial surface of southern Africa appears to be a net mercury sink.