129I distribution patterns in rainfalls over Argentina

NEGRI, A. E. ; ARAZI, A.; FERNÁNDEZ NIELLO, J. ; MARTÍNEZ HEIMANN, D. ; PAPARAS, M. ; WALLNER, A. ; FRÖHLICH, M. ; PAVETICH, S. ; TIMS, S. ; FIFIELD, K. ; BARLASINA, M. E

Ottawa

Conferencia; The 14th International Conference on Accelerator Mass Spectrometry; 2017

University of Ottawa

Iodine is a very mobile element in the environment and its role in atmospheric chemistry is an issue of a growing concern due to the strong impact on tropospheric oxidants pollutants and on the ozone loss in the stratosphere. The dynamics of iodine in the atmosphere and hydrosphere can be traced using the long-lived radioisotope 129I, which is produced by natural and now dominantly by anthropogenic sources. In this work, we present results of total iodine and 129I concentrations in rainwater samples collected from several stationsacross Argentina and a 3-year long temporal series in Buenos Aires City. 129I/127I ratios were measured at the 14 UD accelerator at the Australian National University. From them, 129I and total iodine wet deposition wereassessed. The obtained geographical distribution patterns are analyzed with particular focus on assessing potential sources of atmospheric iodine in the southern hemisphere.