The role of thermal and photochemical reactions upon the remobilisation of Pu from an Irish Sea sediment

McCubbin, D.; Leonard, K.S.; Emerson, Heather

doi:10.1016/s0265-931x(98)00136-2

Cited by 14 publications

(11 citation statements)

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“…Pu inventory in the seabed of the Irish Sea is in the range 440 -560 TBq, with annual transport through the North Channel of 0.5 -1.3 TBq a -1 (Cook et al, 1997;Jones et al, 1999;Kershaw et al, 1999a;Leonard et al, 1999). Recent model predictions support the view that the major Pu source in the Irish Sea is the contaminated sediments resulting from historical Sellafield discharges (Aldridge et al, 2003).…”

Section: +240mentioning

confidence: 95%

“…In shallow waters with higher particle concentrations, preferential removal of McCubbin et al, 1999;Gouzy et al, 2005a;Kaplan et al, 2006). Laboratory studies suggested that only 0.02 -1 % of the total Pu in the sediment is available for remobilisation (McCubbin et al, 1999;McDonald et al, 2001).…”

Section: Behaviour Of Pu In the Marine Environmentmentioning

confidence: 99%

“…Laboratory studies suggested that only 0.02 -1 % of the total Pu in the sediment is available for remobilisation (McCubbin et al, 1999;McDonald et al, 2001). …”

Section: Behaviour Of Pu In the Marine Environmentmentioning

confidence: 99%

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Plutonium isotopes as tracers for ocean processes: A review

Lindahl

Lee

Worsfold

et al. 2010

Marine Environmental Research

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Since the first nuclear weapons tests in the 1940s, pulsed inputs of plutonium isotopes have served as excellent tracers for understanding sources, pathways, dynamics and the fate of pollutants and particles in the marine environment. Due to the well-defined spatial and temporal inputs of Pu, the long half- Pu and its unique chemical properties, Pu is a potential tracer for various physical and biogeochemical ocean processes, including circulation, sedimentation and biological productivity, and hence a means of assessing the impacts of global climate change. Due to the source dependency of the Pu isotopic signature, plutonium isotopes are beginning to be exploited as tools for the evaluation and improvement of regional and global ocean models that will enhance understanding of past and future changes in the oceans. This paper addresses the major sources of Pu and the physical and biogeochemical behaviour in the marine environment. Finally, the use of Pu isotopes as tracers for various oceanic processes (e.g. water mass transport, particle export, and sedimentation) is considered.

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Section: +240mentioning

confidence: 95%

Section: Behaviour Of Pu In the Marine Environmentmentioning

confidence: 99%

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Plutonium isotopes as tracers for ocean processes: A review

Lindahl

Lee

Worsfold

et al. 2010

Marine Environmental Research

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“…Radiotracer techniques have also been used to investigate the uptake of metals by coastal and marine sediments, contributing to an understanding the trace metal behavior in sedimentary environments from intertidal (e.g., Osaki et al 1997) to deep sea areas (e.g., Santschi et al 1984). Such techniques can be helpful in evaluating the metal transport within the sediment column and the efficiency of metal removal from surface waters by different types of bottom sediments (e.g., Petersen et al 1998; Barros et al 2004) or resuspended sediment particles (e.g., Carroll et al 1997;McCubbin et al 1999;Koschinsky et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Removal of Zinc from Tidal Water by Sediments of a Mangrove Ecosystem: A Radiotracer Study

Machado

Bellido

et al. 2008

Water Air Soil Pollut

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The removal of 65 Zn from tidal water by underlaying sediment cores collected in a mangrove forest and a tidal creek that drains this forest in Sepetiba Bay (SE Brazil) was investigated. After 30-h experiments in laboratory microcosms, the 65 Zn half-removal times from tidal creek and mangrove forest sediments were 8.7±1.8 and 9.2±0.9 h respectively. Depth penetration of 65 Zn was mainly restricted to the upper 3 cm in mangrove forest cores, while detectable 65 Zn activities were found in all layers (0-7 cm depth) of tidal creek cores. An unexpected 65 Zn release back to the overlaying water was observed for one of the tidal creek experiments in the 12-18 h interval (corresponding to a return of 17% of the initial 65 Zn activity in overlaying water), suggesting a reversibility of the 65 Zn removal process (e.g., by adsorption) in tidal creek sediments. The results indicate that mangrovevegetated sediments allowed a lower vertical mobility of Zn than observed in creek sediments and mangrove sediments appear to be less susceptible to a reversion in the process of zinc removal from overlaying water, suggesting a greater capacity to retain this metal near the water-sediment interface. This first radiotracer approach on the mangrove sediments removal of Zn from tidal waters supports earlier experimental studies employing stable Zn, contributing for a better understanding of the metal uptake kinetics by such sediments and suggesting that these sediments act as active sinks for trace metals.

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“…Different desorption rates are used for bed sediment and suspended sediment in order to take into account different conditions of light, temperature and aggregation [8]. This appears all the more relevant for the model that redissolution from bed sediments influences mainly the near-bed seawater, while desorption from suspended sediment occurs throughout the water column and therefore is likely to have a stronger influence on the depth averaged level of activity in the dissolved phase.…”

Section: Model Description and Functionalitymentioning

confidence: 99%

Modelling the long term dispersion of radioactive liquid effluent and dose from marine pathways using a grid model

Gleizon¹,

McDonald²,

Bryan³

2009

Radioprotection

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Abstract. A grid model was developed to combine small-scale grid resolution and long-term predictions of radionuclide dispersion in shallow seas. A predictor-corrector algorithm ensures an unconditional stability of the model. Four modules calculate the concentration of suspended sediments, the dispersion of radionuclides in the marine environment, and the doses to members of the public and marine biota. The model was applied to the dispersion of liquid effluent in the Irish Sea from the Sellafield nuclear reprocessing plant, Cumbria (UK). The concentration factors and partition coefficients have been calibrated for biota species and local conditions. The validation against environmental samples for twenty-two radionuclides shows a good agreement between predicted and measured values.

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The role of thermal and photochemical reactions upon the remobilisation of Pu from an Irish Sea sediment

Cited by 14 publications

References 0 publications

Plutonium isotopes as tracers for ocean processes: A review

Plutonium isotopes as tracers for ocean processes: A review

Removal of Zinc from Tidal Water by Sediments of a Mangrove Ecosystem: A Radiotracer Study

Modelling the long term dispersion of radioactive liquid effluent and dose from marine pathways using a grid model

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