Uranium and radium sorption on amorphous ferric oxyhydroxide

Ames, L.L.; McGarrah, J.E.; Walker, B.A.; Salter, P.F.

doi:10.1016/0009-2541(83)90095-5

Cited by 115 publications

(48 citation statements)

References 6 publications

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“…Michel, 1984). Long-lived U may be mobile in groundwater systems until reaching reducing zones, at which it is strongly adsorbed to Fe oxides (Ames et al, 1983;Waite et al, 1994). However, the strong positive correlation of 226 Ra and 228 Ra obtained in this study indicates that both 226 Ra and 228 Ra are present within recoil range of fracture surfaces, indicating the cooccurrence of Th and U in primary and/or secondary minerals near fracture surfaces.…”

Section: Overview Of Radionuclide Sources and Sinkscontrasting

confidence: 49%

Relationships between radium and radon occurrence and hydrochemistry in fresh groundwater from fractured crystalline rocks, North Carolina (USA)

et al. 2009

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a b s t r a c t a r t i c l e i n f oNaturally-occurring radionuclides (uranium, radium, and radon), major dissolved constituents, and trace elements were investigated in fresh groundwater in 117 wells in fractured crystalline rocks from the Piedmont region (North Carolina, USA). Chemical variations show a general transition between two water types: (1) slightly acidic (pH 5.0-6.0), oxic, low-total dissolved solids (TDS) waters, and (2) near neutral, oxic to anoxic, higher-TDS waters. The uranium, radium, and radon levels in groundwater associated with granite (Rolesville Granite) are systematically higher than other rock types (gneiss, metasedimentary, and metavolcanic rocks). Water chemistry plays a secondary role on radium and radon distributions as the 222 Rn/ 226 Ra activity ratio is correlated with redox-sensitive solutes such as dissolved oxygen and Mn concentrations, as well as overall dissolved solids content including major divalent cations and Ba. Since 224 Ra/ 228 Ra activity ratios in groundwater are close to 1, we suggest that mobilization of Ra and Rn is controlled by alpha recoil processes from parent nuclides on fracture surfaces, ruling out Ra sources from mineral dissolution or significant long-distance Ra transport. Alpha recoil is balanced by Ra adsorption that is influenced by redox conditions and/or ion concentrations, resulting in an approximately one order of magnitude decrease (~20,000 to~2000) in the apparent Ra distribution coefficient between oxygensaturated and anoxic conditions and also across the range of dissolved ion concentrations (up to~7 mM). Thus, the U and Th content of rocks is the primary control on observed Ra and Rn activities in groundwater in fractured crystalline rocks, and in addition, linked dissolved solids concentrations and redox conditions impart a secondary control.

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Section: Overview Of Radionuclide Sources and Sinkscontrasting

confidence: 49%

Relationships between radium and radon occurrence and hydrochemistry in fresh groundwater from fractured crystalline rocks, North Carolina (USA)

et al. 2009

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“…The formation of solid strontian barite (or amorphous barite 25 ) in the precipitant is consistent with the corresponding decrease in dissolved concentrations of barium and strontium in the aqueous phase (Figure 2) as well as the calculated SI and PP values of barite in the mixture. Nonetheless, other mineral phases that were calculated using PHREEQC as oversaturated (see Figure S1 of the Supporting Information), such as siderite, celestite, hematite, and Fe(OH) 3 , 26 which are indicated by broad XRD peaks ( Figure S4). Precipitation Kinetics.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

Radium and Barium Removal through Blending Hydraulic Fracturing Fluids with Acid Mine Drainage

Kondash

Warner

Lahav

et al. 2013

Environ. Sci. Technol.

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Wastewaters generated during hydraulic fracturing of the Marcellus Shale typically contain high concentrations of salts, naturally occurring radioactive material (NORM), and metals, such as barium, that pose environmental and public health risks upon inadequate treatment and disposal. In addition, fresh water scarcity in dry regions or during periods of drought could limit shale gas development. This paper explores the possibility of using alternative water sources and their impact on NORM levels through blending acid mine drainage (AMD) effluent with recycled hydraulic fracturing flowback fluids (HFFFs). We conducted a series of laboratory experiments in which the chemistry and NORM of different mix proportions of AMD and HFFF were examined after reacting for 48 h. The experimental data combined with geochemical modeling and X-ray diffraction analysis suggest that several ions, including sulfate, iron, barium, strontium, and a large portion of radium (60− 100%), precipitated into newly formed solids composed mainly of Sr barite within the first ∼10 h of mixing. The results imply that blending AMD and HFFF could be an effective management practice for both remediation of the high NORM in the Marcellus HFFF wastewater and beneficial utilization of AMD that is currently contaminating waterways in northeastern U.S.A.

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“…The podzolization process can occur in association with clay translocation (Buol et al 1980) and the red hues of Bm and Bt horizons can be attributed to secondary Fe oxyhydroxides (Bigham et al 1990;VandenBygaart and Protz 1995b). The surfaces of Fe organo-mineral complexes may be adsorbing the 226 Ra (Nathwani and Phillips 1979;Ames et al 1983;Protz 1995b,1998) and 232 Th (Harmsen and de Haan 1980;Langmuir and Herman 1980;Protz 1995b,1998), and these complexes are translocated from the A horizons and precipitate out of solution in the illuvial Bt horizons as the pH increases (Tate and Theng 1980). Further research may confirm that this process is occurring in the soils of southwestern Ontario.…”

Section: Relationship Of Horizonation and Genesis To Natural Radionucmentioning

confidence: 99%

Distribution of natural radionuclides and ¹³⁷Cs in soils of southwestern Ontario

VandenBygaart

Protz²,

Mccabe

1999

Can. J. Soil. Sci.

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In Canada and the United States approximately 82% of the annual total dose of radiation to any person comes from terrestrial and cosmogenic sources. The soil is also the main source of radon exposure to humans. Therefore it is important to know the background levels of natural and anthropogenic radioactivity in soils. In this study the radionuclides 40K, 226Ra, 232Th and 137Cs were measured in the soils of southwestern Ontario in order to determine the background levels and to understand the soil profile distribution. Clay content is the most important variable affecting the background levels of 40K, 226Ra, and 232Th in the soil. The profile distribution of these radionuclides is further influenced by pedogenic processes, particularly carbonate leaching from the solum and clay illuviation from the Ae to the Bt horizons. The lateral and vertical distribution of bomb-fallout 137Cs is influenced by soil management such as tillage, biopedoturbation by soil animals such as earthworms and groundhogs, soil erosion and soil organic matter cycling. Multiple regression analysis showed that clay content, sand content, percent CaCO3, pH and organic carbon content had variable influences on each of the radionuclide contents in the soil. Key words: Radionuclides, 40K, 226Ra, 232Th, 137Cs, pedogenesis

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Uranium and radium sorption on amorphous ferric oxyhydroxide

Cited by 115 publications

References 6 publications

Relationships between radium and radon occurrence and hydrochemistry in fresh groundwater from fractured crystalline rocks, North Carolina (USA)

Relationships between radium and radon occurrence and hydrochemistry in fresh groundwater from fractured crystalline rocks, North Carolina (USA)

Radium and Barium Removal through Blending Hydraulic Fracturing Fluids with Acid Mine Drainage

Distribution of natural radionuclides and ¹³⁷Cs in soils of southwestern Ontario

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Uranium and radium sorption on amorphous ferric oxyhydroxide

Cited by 115 publications

References 6 publications

Relationships between radium and radon occurrence and hydrochemistry in fresh groundwater from fractured crystalline rocks, North Carolina (USA)

Relationships between radium and radon occurrence and hydrochemistry in fresh groundwater from fractured crystalline rocks, North Carolina (USA)

Radium and Barium Removal through Blending Hydraulic Fracturing Fluids with Acid Mine Drainage

Distribution of natural radionuclides and 137Cs in soils of southwestern Ontario

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Distribution of natural radionuclides and ¹³⁷Cs in soils of southwestern Ontario