Distribution coefficient values describing iodine, neptunium, selenium, technetium, and uranium sorption to Hanford sediments. Supplement 1

Kaplan, D.I.; Seme, R.J.

doi:10.2172/158466

Cited by 35 publications

(42 citation statements)

References 16 publications

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“…Therefore a desorption K d of zero, meaning that the technetium-99 is not interacting with the sediment, should be assumed. The technetium in-situ desorption K d data are consistent with a wealth of literature that finds essentially no technetium adsorption onto Hanford Site sediment (Kaplan and Serne 1995;Kaplan and Serne 2000).…”

Section: Estimates Of Sorption-desorption Valuessupporting

confidence: 85%

Characterization of Vadose Zone Sediment: Borehole 299-E33-46 Near B 110 in the B BX-BY Waste Management Area

Serne¹,

Bjornstad²,

Gee³

et al. 2008

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Executive SummaryThis report was revised in September 2008 to remove acid-ectractable sodium data from Table 4.17. The sodium data was removed due to potential contamination introduced during the acid extraction process. The rest of the text remains unchanged from the original report issued in December 2002.The overall goal of the of the Tank Farm Vadose Zone Project, led by CH2M HILL Hanford Group, Inc., is to define risks from past and future single-shell tank farm activities. To meet this goal, CH2M HILL Hanford Group, Inc., asked scientists from Pacific Northwest National Laboratory to perform detailed analyses on vadose zone sediment from within the B-BX-BY Waste Management Area. This report is the third in a series of three reports to present the results of these analyses. Specifically, this report contains all the geologic, geochemical, and selected physical characterization data collected on vadose zone sediment recovered from a borehole installed approximately 4.5 m (15 ft) northeast of tank B-110 (borehole 299-E33-46).This report also presents our interpretation of the data in the context of the sediment lithologies, the vertical extent of contamination, the migration potential of the contaminants, and the likely source of the contamination in the vadose zone and groundwater east of the B Tank Farm. The information presented in this report supports the B-BX-BY field investigation report prepared by CH2M HILL Hanford Group, Inc. (a) Overall, our analyses identified common ion exchange and heterogeneous (solid phase-liquid solute) precipitation reactions as two mechanisms that influence the distribution of contaminants within that portion of the vadose zone affected by tank liquor. We did not observe significant indications of caustic alteration of the sediment mineralogy or porosity, but we did observe slightly elevated pH values between the depths of 15 and 25 m (52 and 83 ft) bgs. X-ray diffraction measurements indicate no evidence of mineral alteration or precipitation resulting from the interaction of the tank liquor with the sediment. However, no scans of samples by scanning electron microscopy were performed that might suggest that there is faint evidence of caustic attack.Our analyses do not firmly suggest that the source of the contamination in the groundwater below and to the east of B Tank Farm is the 1971 transfer line leak at B-110. However, we are firmly convinced that the fluids from the transfer line leak event are present in the vadose zone sediments at borehole 299-E33-46 to a depth of 52 m (170 ft) bgs, within the Hanford H2 sand unit. Below this depth the concentration of nitrate still appears to be slightly elevated above natural background levels. There is also elevated technetium-99 between 68 and 69 m (222 and 226 ft) bgs in the Plio-pleistocene mud layer but we can't show that this contamination traveled through the entire vadose zone and in fact may have migrated horizontally from other sources. iv The near horizontally bedded, northeasterly dipping sediment likely caused hor...

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Section: Estimates Of Sorption-desorption Valuessupporting

confidence: 85%

Characterization of Vadose Zone Sediment: Borehole 299-E33-46 Near B 110 in the B BX-BY Waste Management Area

Serne¹,

Bjornstad²,

Gee³

et al. 2008

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“…There are, however, exceptions, and these should be taken into account when evaluating their retardation. Kaplan and Serne (1995) determined that iodine sorbed on all Hanford sediments, and its K d ranged from 0.7 to 15 mL/g, with a median value of 7 mL/g. This finding could have significant implications for radionuclide transport.…”

Section: Potential Sorption Of Anionsmentioning

confidence: 99%

“…Anions may sorb onto these locally positive-charged sites, even though their numbers are limited under typical pH conditions. Note that the study of Kaplan and Serne (1995) involved extremely low iodine concentrations (approximately 12 ppt). Therefore, only a small number of positively charged sites would be needed for the sorption of a measurable portion of the dissolved iodine.…”

Section: Potential Sorption Of Anionsmentioning

confidence: 99%

“…Had an initially larger concentration been used in these experiments (e.g., 1 ppm), it is reasonable to expect that a small fractionofiodinewould havesorbedonto thesolidphase, resultinginpracticallyundetectableiodine sorption. It must be pointed out that the 129 I concentrations is expected to be in the part-per-trillion (ppt) range in a low-level waste plume (Kaplan and Serne 1995).…”

Section: Potential Sorption Of Anionsmentioning

confidence: 99%

“…Similarly, significant sorption of technetium could occur in soils containing considerable amounts of natural organic matter, which tends to sorb anionic species and could reduce technetium to its +4 oxidation state, causing precipitation and/or sorption (Kaplan and Serne 1995). In the UZ of YM, however, conditions are both oxidizing and deficient in organic matter.…”

Section: Potential Sorption Of Anionsmentioning

confidence: 99%

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Radionuclide Transport Models Under Ambient Conditions

Moridis¹,

Hu²

2001

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Incorporation of selenium(IV) and selenium(VI) on uranyl peroxide

Martínez-Torrents

Giménez

Martínez‐Lladó

et al. 2014

J Radioanal Nucl Chem

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© 2014, Akadémiai Kiadó, Budapest, Hungary. The sorption of Se(IV) and Se(VI) on uranium peroxide has been studied considering the sorption kinetics, the sorption isotherms and the effect of pH. Selenium sorption on studtite is fitted with a pseudosecond order reaction model; in addition, two different mechanisms seem to influence the sorption process: micropore diffusion and intra-particle diffusion. Both selenium(IV) and selenium(VI) are sorbed on studtite through a monolayer coverage. Sorption is higher at acidic pH than at alkaline pH. This behaviour is consistent with the chemical speciation of selenium in solution and with the acid–base properties of the solid.Postprint (published version

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Distribution coefficient values describing iodine, neptunium, selenium, technetium, and uranium sorption to Hanford sediments. Supplement 1

Cited by 35 publications

References 16 publications

Characterization of Vadose Zone Sediment: Borehole 299-E33-46 Near B 110 in the B BX-BY Waste Management Area

Characterization of Vadose Zone Sediment: Borehole 299-E33-46 Near B 110 in the B BX-BY Waste Management Area

Radionuclide Transport Models Under Ambient Conditions

Incorporation of selenium(IV) and selenium(VI) on uranyl peroxide

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