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- W2314784119 abstract "129I derived from a former radionuclide disposal basin located on the Savannah River Site (SRS) has concentrated in a wetland 600 m downstream. To evaluate temporal environmental influences on iodine speciation and mobility in this subtropical wetland environment, groundwater was collected over a three-year period (2010–2012) from a single location. Total 127I and 129I showed significant temporal variations, ranging from 68–196 nM for 127I and <5–133 pCi/L for 129I. These iodine isotopes were significantly correlated with groundwater acidity and nitrate, two parameters elevated within the contaminant plume. Additionally, 129I levels were significantly correlated with those of 127I, suggesting that biogeochemical controls on 127I and 129I are similar within the SRS aquifer/wetland system. Iodine speciation demonstrates temporal variations as well, reflecting effects from surface recharges followed by acidification of groundwater and subsequent formation of anaerobic conditions. Our results reveal a complex system where few single ancillary parameters changed in a systematic manner with iodine speciation. Instead, changes in groundwater chemistry and microbial activity, driven by surface hydrological events, interact to control iodine speciation and mobility. Future radiological risk models should consider the flux of 129I in response to temporal changes in wetland hydrologic and chemical conditions." @default.
- W2314784119 created "2016-06-24" @default.
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- W2314784119 date "2014-09-15" @default.
- W2314784119 modified "2023-09-28" @default.
- W2314784119 title "Temporal Variation of Iodine Concentration and Speciation (<sup>127</sup>I and <sup>129</sup>I) in Wetland Groundwater from the Savannah River Site, USA" @default.
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- W2314784119 doi "https://doi.org/10.1021/es502003q" @default.
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