Factors controlling mobility of 127I and 129I species in an acidic groundwater plume at the Savannah River Site

Otosaka, Shigeyoshi; Schwehr, Kathleen A.; Kaplan, Daniel I.; Roberts, Kimberly A.; Zhang, Saijin; Xu, Chen; Li, Hsiu-Ping; Ho, Yi‐Fang; Brinkmeyer, Robin; Yeager, Chris M.; Santschi, Peter H.

doi:10.1016/j.scitotenv.2011.05.018

Cited by 74 publications

(105 citation statements)

References 28 publications

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“…Dong et al 13 determined that kaolinite is a more important sorbent for U(VI) at pH < 4.0, while goethite plays major role at pH > 4.0. The rising 129 I concentrations in recent years is attributed to its increased mobility in response to gradual increases in pH, as discussed in recent studies 3,14,15 . Drainage rates beneath the basin have been estimated at about 0.5 m y -1 during initial dewatering, declining to several cm y -1 after 20 years 16 .…”

Section: Introductionmentioning

confidence: 83%

Persistent Source Influences on the Trailing Edge of a Groundwater Plume, and Natural Attenuation Timeframes: The F-Area Savannah River Site

Wan

Tokunaga

Dong

et al. 2012

Environ. Sci. Technol.

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ABSTRACT. At the Savannah River Site's F-Area, wastewaters containing radionuclides were disposed into seepage basins for decades. After closure and capping in 1991, the US Department of Energy (DOE) has being monitoring and remediating the groundwater plume. Despite numerous studies of the plume, its persistence for over 20 years has not been well understood. To better understand the plume dynamics, a limited number of deep boreholes were drilled to determine the current plume characteristics. A mixing model was developed to predict plume tritium and nitrate concentrations. We found that the plume trailing edges have emerged for some contaminants, and that contaminant recharge from the basin's vadose zone is still important. The model's estimated time-dependent basin drainage rates combined with dilution from natural recharge successfully predicted plume tritium and nitrate concentrations. This new understanding of source zone influences can help guide science-based remediation, and improve predictions of the natural attenuation timeframes.3

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Section: Introductionmentioning

confidence: 83%

Persistent Source Influences on the Trailing Edge of a Groundwater Plume, and Natural Attenuation Timeframes: The F-Area Savannah River Site

Wan

Tokunaga

Dong

et al. 2012

Environ. Sci. Technol.

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“…In forest soil, besides atmosphere deposition, degraded tree leaves absorbed 129 I from the atmosphere fall onto the soil surface might be extra source of 129 I in the soil, which make the 129 I concentration in forest soil higher than other soil type. Retention of the radionuclide in the soil layer depends on various factors, one of which is the organic matter content in soil [23], [36], [44]. The organic matter content in forest samples ranged from 9 to 89%, while in the meadow samples it ranged from 4 to 14%.…”

Section: Distribution and Sources Of Iodine Isotopesmentioning

confidence: 99%

Distribution and source of 129 I, 239 ,240 Pu, 137 Cs in the environment of Lithuania

Ežerinskis

Hou

Druteikienė

et al. 2016

Journal of Environmental Radioactivity

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“…Iodine speciation is affected by temperature, pH, redox potential and existence of organic matter (Otosaka et al, 2011;Taghipour and Evans, 2002;). The uptake of iodine by organic matter cannot occur under anoxic conditions, for which essentially all the iodine is present in the iodide form (Richard and Goana, 2011).…”

Section: Iodine Chemistry In Watermentioning

confidence: 99%

Effects of depth on transport of 129I in crystalline rock

Oruçoğlu

Akker

Ahn

2014

Annals of Nuclear Energy

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a b s t r a c tIn the present paper, a model for the transport of iodine through fractures in granitic rock has been developed by taking into account the variation of parameters with depth in order to investigate the effects of depth on repository performance. First, the evolution of groundwater chemistry with depth has been modeled by considering the physical and chemical conditions that vary with depth. Second, iodine-water interactions and iodine-rock interactions under groundwater-chemistry evolution with depth in crystalline rocks have been modeled using PHREEQC, with which the distribution coefficients of iodine have been numerically evaluated as a function of depth. These values and other depth-dependent parameters such as fracture aperture, groundwater velocity, and diffusion coefficients have been used in the iodine transport simulation to observe differences in the iodine concentration in the water from repositories located at 500 and 1000 m depths. The results show that iodine stays within the vicinity of the repository if it is disposed of at a greater depth. The main reason is that the retention effect of matrix diffusion increases and relative contribution of advection along fractures decreases at depth due to the cubic law for the water flow velocity in fractures.

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Factors controlling mobility of 127I and 129I species in an acidic groundwater plume at the Savannah River Site

Cited by 74 publications

References 28 publications

Persistent Source Influences on the Trailing Edge of a Groundwater Plume, and Natural Attenuation Timeframes: The F-Area Savannah River Site

Persistent Source Influences on the Trailing Edge of a Groundwater Plume, and Natural Attenuation Timeframes: The F-Area Savannah River Site

Distribution and source of 129 I, 239 ,240 Pu, 137 Cs in the environment of Lithuania

Effects of depth on transport of 129I in crystalline rock

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