Transuranic biokinetic parameters for marine invertebrates—a review

Ryan, Tom

doi:10.1016/s0160-4120(02)00011-9

Cited by 12 publications

(13 citation statements)

References 28 publications

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“…Interestingly, scallops show a high accumulation capacity for radionuclides (Miramand et al, 1991;Nonnis Marzano et al, 2000;Bustamante et al, 2002), more so than in other bivalve species such as mussels (JCAC, 2002). However, little is known about the behavior of radionuclides in scallops and their mode of uptake in comparison to other bivalve families such as Ostreidae or Mytilidae (Ryan, 2002). To the best of our knowledge, experimental investigations have been limited to describing the uptake of waterborne 241 Am in P. maximus and to the localization of this transuranic element in digestive gland cells (Miramand and Germain, 1986;Miramand et al, 1991).…”

Section: Discussionmentioning

confidence: 99%

“…The importance of other contamination pathways in the bioaccumulation process of Am and Cs in scallops is not known although sediment and food have been considered as possible sources of Am and Cs following analyses carried out on scallops from the field or after laboratory studies (Miramand and Germain, 1986;Nonnis Marzano et al, 2000) including a histo-autoradiography approach (Miramand et al, 1991). Overall, sediment is considered as a major vector of transuranic elements, such as Am, to biota (Miramand et al, 1982;Bustamante et al, 2006;Ryan, 2002). In comparison, Cs transfer from sediments appears relatively limited (Bustamante et al, 2006;Borretzen and Salbu, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of 241Am and 134Cs bioaccumulation in the king scallop Pecten maximus: investigation via three exposure pathways

Métian

Warnau

Teyssié

et al. 2011

Journal of Environmental Radioactivity

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In order to understand the bioaccumulation of (241)Am and (134)Cs in scallops living in sediments, the uptake and depuration kinetics of these two elements were investigated in the king scallop Pecten maximus exposed via seawater, food, or sediment under laboratory conditions. Generally, (241)Am accumulation was higher and its retention was stronger than (134)Cs. This was especially obvious when considering whole animals exposed through seawater with whole-body concentration factors (CF(7d)) of 62 vs. 1, absorption efficiencies (A(0l)) of 78 vs. 45 for seawater and biological half-lives (T(b½l)) of 892 d vs. 22 d for (241)Am and (134)Cs, respectively. In contrast, following a single feeding with radiolabelled phytoplankton, the assimilation efficiency (AE) and T(b½l) of (134)Cs were higher than those of (241)Am (AE: 28% vs. 20%; T(b½l): 14 d vs. 9 d). Among scallop tissues, the shells always contained the higher proportion of the total body burden of (241)Am whatever the exposure pathway. In contrast, the whole soft parts presented the major fraction of whole-body burden of (134)Cs, which was generally associated with muscular tissues. Our results showed that the two radionuclides have contrasting behaviors in scallops, in relation to their physico-chemical properties.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of 241Am and 134Cs bioaccumulation in the king scallop Pecten maximus: investigation via three exposure pathways

Métian

Warnau

Teyssié

et al. 2011

Journal of Environmental Radioactivity

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“…Sediment-dwelling species play a significant role in the remobilisation process, as they may redistribute deposited Pu in the sediments by mixing and agitation (Ryan, 2002).…”

Section: Behaviour Of Pu In the Marine Environmentmentioning

confidence: 99%

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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“…Models describing the accumulation of radionuclides by organisms in biological communities are often based on concentration and transfer factors (Blust, 2001). These factors do not fully describe the concentration of a radionuclide in an organism, either relative to the water surrounding it or relative to the concentration in their prey (Blust, 2001;Ryan, 2002). From an ecological perspective, the concentration and transfer factors do not include all the complex pathways whereby radionuclides are transferred in ecosystems, since they depend on the dynamic environmental conditions and is influenced by physical and biological interactions occurring in the system.…”

Section: Introductionmentioning

confidence: 99%

“…From an ecological perspective, the concentration and transfer factors do not include all the complex pathways whereby radionuclides are transferred in ecosystems, since they depend on the dynamic environmental conditions and is influenced by physical and biological interactions occurring in the system. The type of radionuclides as well as the specific conditions prevailing during experimentation might also be of importance (Ryan, 2002).…”

Section: Introductionmentioning

confidence: 99%