Influence of the Physico-Chemical Forms of Radionuclides and Stable Trace Elements in Seawater in Relation to Uptake by the Marine Biosphere.

Robertson, D.E.

doi:10.2172/4723818

Cited by 8 publications

(3 citation statements)

References 26 publications

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“…Generally, CR values for Sr isotopes are similar to those of the stable element because most of the Sr in SW is in a soluble form; therefore, stable Sr data have also been used to summarize CR in the marine environment. , However, these two species data (U. pertusa and T.…”

Section: Resultsmentioning

confidence: 99%

Collation of Strontium Concentration Ratios from Water to Aquatic Biota Species in Freshwater and Marine Environments and Factors Affecting the Ratios

Tagami

Fukaya

Hirayama

et al. 2021

Environ. Sci. Technol.

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The fate of strontium-90 (90Sr) from water to aquatic biota is of concern since the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident because of continuous small 90Sr releases to the seawater from the FDNPP site. The Japanese diet includes many edible marine and freshwater species, and the environmental parameter, that is, the concentration ratio (CR) from water to biota, is useful to estimate the potential 90Sr intake, especially from frequently consumed seafoods. However, widely used CR data for radiation dose assessment only have provided values for biota types such as fish, crustaceans, macroalgae, and so forth, and thus, it is difficult to identify specific data for each species. In this study, therefore, we collated CR data of Sr for aquatic biota by surveying available open data sources from the 1950s to 2019, not only for edible parts but also for whole and inedible parts. In total, we obtained 3800 CR data: 3013 data for marine biota, 28 data for brackish water biota, and 759 data for freshwater biota. The results showed that species-specific CRs may decrease the uncertainties compared to those published in IAEA documents; however, different diets and living areas by species may lead to different uncertainties for different species.

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Section: Resultsmentioning

confidence: 99%

Collation of Strontium Concentration Ratios from Water to Aquatic Biota Species in Freshwater and Marine Environments and Factors Affecting the Ratios

Tagami

Fukaya

Hirayama

et al. 2021

Environ. Sci. Technol.

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“…As considered by Robertson (1971), radionuclides often enter the oceans in forms completely different from that of their stable isotopes naturally present. If the equilibration between these different forms is slow, the uptake, distribution and behavior of the radionuclides and their naturally occurring stable isotopes by the marine biosphere could show significant anomalies.…”

Section: Confounding Factors In the Application Of Reml To Marine Sysmentioning

confidence: 99%

“…Nonetheless, for the case of radiocaesium, at least, the physico-chemical form in seawater, once equilibration has occurred, might be expected to be monotonous over large regional scales reflecting the substantial mixing of marine water bodies and the similarity in water chemistry of the world's oceans. Caesium, an alkali metal, forms monovalent Cs+ ions in seawater and in an extensive study, conducted many decades ago, was found to be present as less than 1 % particulate form in open oceanic waters (Robertson, 1971) . Radiocaesium/ is often classified as behaving conservatively in seawater, having a low affinity for particle association and with a behavior consequently controlled by the physics of ocean circulation and mixing (Livingston and Povinec, 2002).…”

Section: Other Factors Which May Affect Radiocaesium Transfermentioning

confidence: 99%

Exploring taxonomic and phylogenetic relationships to predict radiocaesium transfer to marine biota

Brown

Beresford

Hevrøy

2019

Science of The Total Environment

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One potentially useful approach to fill data gaps for concentration ratios, CRs, is based upon the hypothesis that an underlying taxonomic and/or phylogenetic relationship exists for radionuclide transfer. The objective of this study was to explore whether these relationships could be used to explain variation in the transfer of radiocaesium to a wide range of marine organisms. CR data for Cs were classified in relation to taxonomic family, order, class and phylum. A Residual Maximum Likelihood (REML) mixed-model regression modelling approach was adopted. The existence of any patterns were then explored using phylogenetic trees constructed with mitochondrial COI gene sequences from various biota groups and mapping the REML residual means onto these trees. A comparison of the predictions made using REML with blind datasets allowed the efficacy of the procedure to be tested. The only significant correlation between predicted and measured activity concentrations was revealed at the taxonomic level of order when comparing REML analysis output with data from the Barents Sea Region. For this single case a correlation 0.80 (Spearman rank) was derived which was significant at the 0.01 level (1-tailed test) although this was not the case once a (Bonferroni) correction was applied. The application of the REML approach to marine datasets has met with limited success, and the phylogenetic trees illustrate complications of using predictions based on values from different levels of taxonomic organization, where predicted values for the order level can mask the values at lower taxonomic levels. Any influence of taxonomy and phylogeny on transfer is not immediately conspicuous and categorizing marine organisms in this way is limited in providing a potentially robust prognostic extrapolation tool. Other factors may plausibly affect transfer to a much greater degree in marine systems, such as quite diverse life histories and different diets, which may confound any phylogenetic pattern.

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2022

Marine Radioecology

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Influence of the Physico-Chemical Forms of Radionuclides and Stable Trace Elements in Seawater in Relation to Uptake by the Marine Biosphere.

Cited by 8 publications

References 26 publications

Collation of Strontium Concentration Ratios from Water to Aquatic Biota Species in Freshwater and Marine Environments and Factors Affecting the Ratios

Collation of Strontium Concentration Ratios from Water to Aquatic Biota Species in Freshwater and Marine Environments and Factors Affecting the Ratios

Exploring taxonomic and phylogenetic relationships to predict radiocaesium transfer to marine biota

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