I-127 and I-129 Species and Transformation in the Baltic Proper, Kattegat, and Skagerrak Basins
2012 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 46, no 20, 10948-10956 p.Article in journal (Refereed) Published
Occurrence of anthropogenic I-129 in seawater has provided invaluable information about water circulation and exchange rates, but results on I-129 species (iodide and iodate) are limited and only available for surface water. We here present the first extensive results on I-129 and I-127 species in samples of seawater depth profiles, which were collected in August 2006 and April 2007 in the Skagerrak, Kattegat, and Baltic Proper. The results expose <= 10% annual reduction of iodate as I-129 is transported from the English Channel along the Dutch coast and German Bight into the Skagerrak and Kattegat. The results also suggest strong variability between surface and bottom seawater with respect to the predominant iodine species. Distribution of iodide and iodate of both I-127 and I-129 in the Kattegat mainly reflects water mixing process rather than speciation transformation. In water of the Baltic Proper, high I-127(-)/(IO3-)-I-127 and I-129-/(IO3-)-I-129 values suggest effective reduction of iodate with a maximum rate of 8 x 10(-7) ((IO3-)-I-127) and 6 x 10(-14) ((IO3-)-I-129) (g/m(3).day). The reduction process of iodate seems to be related to decomposition of organic matter and photochemically induced reactions.
Place, publisher, year, edition, pages
2012. Vol. 46, no 20, 10948-10956 p.
IdentifiersURN: urn:nbn:se:uu:diva-187716DOI: 10.1021/es301979rISI: 000309805000015OAI: oai:DiVA.org:uu-187716DiVA: diva2:575687