Tracer and radionuclide sorption to vitric tuffs of Busted Butte, Nevada

Turin, H.; Groffman, A. R.; Wolfsberg, Laura E.; Roach, J L; Strietelmeier, Betty A.

doi:10.1016/s0883-2927(02)00042-2

Cited by 25 publications

(22 citation statements)

References 7 publications

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“…In prior work, results similar to those found in this study were obtained by Turin et al [25], who performed fieldscale unsaturated-zone tracer tests at Busted Butte, Nevada, near the potential high-level radioactive waste repository at Yucca Mountain, their conclusion was that plutonium sorption was markedly nonlinear, and that the Freundlich isotherm described Pu sorption quite well. Turin et al attributed the behavior of Pu to the redox reactions, at higher concentrations, the disproportionation of Pu(V) leaded to an increased proportion of strongly sorbing Pu(IV) and an increase in apparent sorption [25].…”

Section: Sorption Isothermssupporting

confidence: 88%

“…Turin et al attributed the behavior of Pu to the redox reactions, at higher concentrations, the disproportionation of Pu(V) leaded to an increased proportion of strongly sorbing Pu(IV) and an increase in apparent sorption [25]. However, a major problem limiting the application of the Freundlich model is that it only considers the total aqueous concentrations of the component, ignoring the thermodynamic properties of the constituent aqueous species (such as Pu with multiple oxidation states); it also ignores the speciation of the sorbing surface.…”

Section: Sorption Isothermsmentioning

confidence: 99%

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Factors influencing plutonium sorption in shale media

et al. 2010

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Plutonium / Sorption / Distribution coefficient / Grain size / pH / Water/solid ratio / ComplexationSummary. The extent and factors influencing sorption of plutonium (Pu) in shale media have been studied in batchtype experiments. The equilibrium time and isotherm of Pu sorption have been firstly determined. The effect of shale grain size, aqueous pH, water/solid ratio, co-existing ions (cations and anions) and temperature were studied as the factors likely to influence Pu sorption. The experimental variables included the following: grain sizes in five ranges, 0.12 to 0.15 mm, 0.15 to 0.18 mm, 0.18 to 0.25 mm, 0.25 to 0.38 mm, and 0.38 to 0.83 mm; solution pH values of 4, 6, 8, and 10; water/solid ratios of 10 : 0.25, 10 : 0.5, 10 : 0.75, and 10 : 1; temperatures of 20 • C, 40 • C, and 60 • C); and selected coexisting conventional cations including Na + , Fe + , Al 3+ , Ca 2+ , and K + and anions including SO 4 2− , CO 3 2− , NO 3 − , and Cl − in each case in solutions of the same total ionic strength. The experimental results demonstrate that the equilibrium time of Pu sorption is 9 d, that the sorption behavior of Pu in the solution is well described by the Freundlich sorption isotherm (C s = kC N eq ), and that Pu is strongly sorbed on shale media. The extent of Pu sorption increased with decreasing grain size, apparently in response to the increase in specific surface area and total pore volume. The results also show that Pu sorption increases with increasing solution pH and with increasing water/solid ratio. The influence of co-existing anions on Pu sorption was much stronger, under the same conditions, than that of the cations; this was attributed to Pu complexation in solution, i.e., the complexing apparently weakened the sorption of Pu on shale particles in the solution. Finally, the influence of varying temperature on Pu sorption is found to be less important than that of other factors, but should never be ignored.

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Section: Sorption Isothermssupporting

confidence: 88%

Section: Sorption Isothermsmentioning

confidence: 99%

Factors influencing plutonium sorption in shale media

et al. 2010

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“…Doubling the leaching water (from 500 to 1,000 ml) only decreases the residual iodine by about 1.5% of the applied iodine. Note that the applied iodine in these experiments is iodide, which is often considered as a nonreactive tracer (Turin et al 2002) because iodide sorption onto many types of geologic media is extremely limited (Whitehead 1984;Turin et al 2002). Although significant iodide sorption to the soils has been reported (Hu et al 2005), mostly with significant positively charged surfaces, the retention rate of 80% observed in this study cannot be explained by the sorption of iodide onto soils.…”

Section: Resultsmentioning

confidence: 64%

Biogeochemical transfer and dynamics of iodine in a soil–plant system

Weng

Yan

Hong

et al. 2008

Environ Geochem Health

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Radioactive iodide (125I) is used as a tracer to investigate the fate and transport of iodine in soil under various leaching conditions as well as the dynamic transfer in a soil-plant (Chinese cabbage) system. Results show that both soils (the paddy soil and the sandy soil) exhibit strong retention capability, with the paddy soil being slightly stronger. Most iodine is retained by soils, especially in the top 10 cm, and the highest concentration occurs at the top most section of the soil columns. Leaching with 1-2 pore volume water does not change this pattern of vertical distributions. Early breakthrough and long tailing are two features observed in the leaching experiments. Because of the relatively low peak concentration, the early breakthrough is really not an environmental concern of contamination to groundwater. The long tailing implies that the retained iodine is undergoing slow but steady release and the soils can provide a low but stable level of mobile iodine after a short period. The enrichment factors of 125I in different plant tissues are ranked as: root > stem > petiole > leaf, and the 125I distribution in the young leaves is obviously higher than that in the old ones. The concentrations of 125I in soil and Chinese cabbage can be simulated with a dual-chamber model very well. The biogeochemical behaviors of iodine in the soil-cabbage system show that cultivating iodized cabbage is an environmentally friendly and effective technique to eliminate iodine deficiency disorders (IDD). Planting vegetables such as cabbage on the 129I-contaminated soil could be a good remediation technique worthy of consideration.

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“…Average values for devitrified, vitric, and zeolitized tuff were 2975, 1430, and 1513 ml g À1 , respectively. Turin et al (2002) measured K d s ranging from 410 to 510 ml g À1 using similar waters and tuffaceous rocks from Busted Butte on the Nevada Test Site. They also provide Freundlich isotherm parameters from the sorption measurements.…”

Section: Actinides and Nuclear Waste Disposalmentioning

confidence: 99%