Laboratory of Radiochemistry, Department of Chemistry, PO Box 55, FIN-00014 University of Helsinki, Finland.
Sci Total Environ. 2012 Mar 1;419:60-7. doi: 10.1016/j.scitotenv.2011.12.061. Epub 2012 Jan 28.
Concentrations of the very long-lived fission product (129)I and stable iodine ((127)I) in the Baltic Sea and lake and rain waters from Finland, were measured as well as their occurrence as iodide (I(-)) and iodate (IO(3)(-)). The highest concentrations of both (127)I and (129)I occurred in sea water, on average 11.1 ± 4.3 μg/l and 3.9 ± 4.1 × 10(-9) at/l. In rain and lake waters the concentration of (129)I was more or less identical and almost one order of magnitude lower than in sea water. Based on these observations, and data from the literature, it is assumed that the source of (129)I in lakes is precipitation and the major source in the Baltic Sea is the inflow of sea water from the North Sea through the Danish Straits. The concentration of (129)I in the Baltic Sea has increased by a factor of six during ten years from 1999. In all studied water types the main chemical form of both iodine isotopes was iodide; in sea and lake waters by 92-96% and in rain water by 75-88%. Compared to (127)I the fraction of iodide was slightly higher in case of (129)I in all waters.
研究人员还测量了波罗的海以及芬兰湖泊和雨水样本中长寿命裂变产物（129）I 和稳定碘（127）I 的浓度，以及它们以碘化物（I(-)）和碘酸盐（IO(3)(-)）的形式存在的情况。海水中（127）I 和（129）I 的浓度最高，平均值分别为 11.1 ± 4.3 μg/l 和 3.9 ± 4.1 × 10(-9) at/l。在雨水和湖水样本中，（129）I 的浓度或多或少相同，几乎低一个数量级。基于这些观察结果以及文献中的数据，研究人员假设湖泊中（129）I 的来源是降水，而波罗的海的主要来源则是北海通过丹麦海峡流入的海水。1999 年以来，在过去的十年中，波罗的海（129）I 的浓度增加了六倍。在所研究的所有水样类型中，碘同位素的主要化学形式均为碘化物；在海水和湖水中占 92-96%，在雨水中占 75-88%。与（127）I 相比，在所有水样中（129）I 的碘化物比例略高。
