Behavior of radium, thorium and uranium in groundwater near the Buena Lagoon in the Coastal Zone of the State of Rio de Janeiro, Brazil

Lauria, Dejanira da Costa; Almeida, Rodrigo Menezes Raposo de; Šráček, Ondra

doi:10.1007/s00254-004-1121-1

Cited by 42 publications

(22 citation statements)

References 10 publications

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“…Once again, the sediment chemistry influences the amount of Ra release, with sediments from the bottom Mn (hydr)oxide rich layer releasing less Ra than sediments from the top and middle. It is likely that this increased release at pH 5 compared to pH 8 is not only due to desorption, but rather to dissolution of the oxides onto which surface Ra is bound, which explains why Ra release is observed at salinity 0, where significant Ra desorption is not expected (Lauria et al, 2004;Sanchez and Rodriguez-Alvarez, 1999). …”

Section: Ra Release and Groundwater Phmentioning

confidence: 98%

“…Ra release in surface estuaries has been mainly attributed to desorption of Ra from suspended and bottom sediments as salinity increases (Li and Chan, 1979;Elsinger and Moore, 1980). However, radium behavior within the STE has additional complexity including varying fractions of exchangeable sediment Ra (Porcelli and Swarzenski, 2003); grain size and porosity of sediments (Webster et al, 1995, Hancock et al, 2006; changes in ionic strength (salinity) (Elsinger and Moore, 1980;Webster et al, 1995); temperature effects (Rama and Moore, 1996); pH (Sanchez and Rodriguez-Alvarez, 1999;Lauria et al, 2004); and barite solubility (Ba and Ra are chemical analogs) (Langmuir and Riese, 1985;Grundl and Cape, 2006). Other controls have been suggested but not thoroughly examined including the redox state of groundwater (including Eh and pH) (Puigdomènech and Bergström, 1995;Porcelli and Swarzenski, 2003) and the presence Fe and, in particular, Mn (hydr)oxides, since Ra has a very high affinity for Mn and Fe (Bollinger and Moore, 1993;Sun and Torgersen, 2001;Charette and Sholkovitz, 2006).…”

Section: Introductionmentioning

confidence: 99%

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New perspectives on radium behavior within a subterranean estuary

et al. 2008

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Abstract:Over the past decade, radium isotopes have been frequently applied as tracers of submarine groundwater discharge (SGD). The unique radium signature of SGD is acquired within the subterranean estuary, a mixing zone between fresh groundwater and seawater in coastal aquifers, yet little is known about what controls Ra cycling in this system. The focus of this study was to examine controls on sediment and groundwater radium activities within permeable aquifer sands (Waquoit Bay, MA, USA) through a combination of field and laboratory studies. In the field, a series of sediment cores and corresponding groundwater profiles were collected for analysis of the four radium isotopes, as well as dissolved and sediment associated manganese, iron, and barium. We found that in addition to greater desorption at increasing salinity, radium was also closely tied to manganese and iron redox cycling within these sediments. A series of laboratory adsorption/desorption experiments helped elucidate the importance of 1) contact time between sediment and water, 2) salinity of water in contact with sediment, 3) redox conditions of water in contact with sediment, and 4) the chemical characteristics of sediment on radium adsorption/desorption. We found that these reactions are rapid (on the order of hours), desorption increases with increasing salinity and decreasing pH, and the presence of Fe and Mn (hydr)oxides on the sediment inhibit the release of radium.These sediments have a large capacity to sorb radium from fresh water. Combined with these experimental results, we present evidence from time series groundwater sampling 2 that within this subterranean estuary there are cyclic periods of Ra accumulation and release controlled by changing salinity and redox conditions.

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Section: Ra Release and Groundwater Phmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

New perspectives on radium behavior within a subterranean estuary

et al. 2008

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“…The radium isotope concentrations are also significantly controlled by chemical water composition and increase with water mineralization (TDS). This fact is attributed to the ion exchange with Ra for the available adsorption sites in the surface of the rock minerals of aquifers (Kraemer & Reid 1984, Lauria et al 2004. In surface, brackish or shallow groundwater the activity concentrations of 226 Ra are often lower than that of 228 Ra and the contents of both isotopes are usually very low, ranging from a hundredth to several milibekerels per liter (Elsinger & Moore 1983, Dickson 1985, Krest et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Factors controlling 226Ra, 228Ra and their activity ratio in groundwater – an application in Polish Carpathian mineral waters

Nguyen

Kopeć

Nowak

2016

geol

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Abstract:The influences of aquifer formations and water chemical composition on the occurrence and activity ratio of radium isotopes in groundwater are discussed. Based on the model of desorption/adsorption processes of natural radionuclides in the rock-water system, the concentrations of radium isotopes and their activity ratio in groundwater are evaluated by the numerical Monte Carlo method (MC). In cases where the groundwater is of a similar age, limited flow (up to several meters/year), the physical conditions and the uranium and thorium activity ratios in host water formations are similar, the activity concentrations of radium isotopes ( 226 Ra, 228 Ra) and their activity ratio ( 226 Ra/ 228 Ra) are the highest in the water of high desorption coefficient for chloride sodium water (domination of Cl − , Na + ions), medium in water of moderate desorption (bicarbonate water -HCO 3 − , Ca 2+ ) and the lowest in waters with a low desorption coefficient (sulfate ions prevailing -SO 4 2− , Ca 2− ). The statements are well confirmed in the case of the natural mineral waters from the Polish Outer Carpathians. The total dissolved solids (TDS) of the Polish Carpathians waters varies from several hundred milligrams per liter to several tens of thousands milligrams per liter. The minimum, maximum and average concentrations of 226 Ra, 228 Ra and their activity ratio ( 226 Ra/ 228 Ra) are 82, 1340, 456 mBq/L, 19, 1240, 354 mBq/L and 0.89, 7.6 and 2.0 for chloride waters; 4, 140, 45.8 mBq/L, 12, 171, 62.7 mBq/L and 0.3, 1.7 and 0.70 for bicarbonate waters and 0.8, 9.3, 3.6 mBq/L, 5.3, 54, 20.1 mBq/L and 0.1, 1.0, 0.3 for sulfate ones, respectively. The desorption coefficients are the highest for the Cl-Na, moderate for the HCO 3 -Ca and the lowest for the SO 4 -Ca waters (in contrast to the adsorption properties of these waters).

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“…A low pH value is the most important water parameter linked to high radium concentration. This is probably related to limited adsorption of radium on ferric oxides and hydroxides in soil at low pH range Lauria et al, 2004). However, an increase in the pH results in an increased concentration of uranium (Butler and Kahn, 1995).…”

Section: Concentration Range Of Radionuclides In the Study Areamentioning

confidence: 99%

Evaluation of radionuclides in groundwater around proposed uranium mining sites in Bagjata and Banduhurang, Jharkhand (India)

2011

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Radionuclides find their way into the water resources at sites in the vicinity of nuclear facilities involved in mining, milling, ore separation, purification, etc. The presented study delineates the distribution of radionuclides {Ra and U(nat)} in groundwaters existing in the vicinity of two proposed uranium mine sites and evaluates their ingestion dose through the intake of drinking water. The study reveals that the U(nat) concentration in groundwater varied from <0.5 to 11.2 µg.l -1 in the Bagjata mining area and from <0.5 to 27.5 µg.l -1 in the Banduhurang mining area, while 226

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Behavior of radium, thorium and uranium in groundwater near the Buena Lagoon in the Coastal Zone of the State of Rio de Janeiro, Brazil

Cited by 42 publications

References 10 publications

New perspectives on radium behavior within a subterranean estuary

New perspectives on radium behavior within a subterranean estuary

Factors controlling 226Ra, 228Ra and their activity ratio in groundwater – an application in Polish Carpathian mineral waters

Evaluation of radionuclides in groundwater around proposed uranium mining sites in Bagjata and Banduhurang, Jharkhand (India)

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