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Mass spectrometry – based imaging techniques for iodine-127 and iodine-129 detection and localization in the brown alga Laminaria digitata

hal.structure.identifierService d'Etudes du Comportement des Radionucléides [SECR]
dc.contributor.authorLEBEAU, Diane
hal.structure.identifierService d'Etudes du Comportement des Radionucléides [SECR]
dc.contributor.authorLEROY, Nathalie
hal.structure.identifierService d'Etudes du Comportement des Radionucléides [SECR]
dc.contributor.authorDOIZI, Denis
hal.structure.identifierInstitut Curie [Paris]
dc.contributor.authorWU, Ting-Di
hal.structure.identifierInstitut Curie [Paris]
dc.contributor.authorGUERQUIN-KERN, Jean-Luc
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorPERRIN, Laura
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorORTEGA, Richard
hal.structure.identifierLaboratoire de Radioécologie de Cherbourg-Octeville [IRSN/PSE-ENV/SRTE/LRC]
dc.contributor.authorVOISEUX, Claire
hal.structure.identifierLaboratoire de Biologie Intégrative des Modèles Marins [LBI2M]
dc.contributor.authorFOURNIER, Jean-Baptiste
hal.structure.identifierLaboratoire de Biologie Intégrative des Modèles Marins [LBI2M]
dc.contributor.authorPOTIN, Philippe
hal.structure.identifierLaboratoire de Radioécologie de Cherbourg-Octeville [IRSN/PSE-ENV/SRTE/LRC]
dc.contributor.authorFIÉVET, Bruno
hal.structure.identifierLaboratoire de Biologie Intégrative des Modèles Marins [LBI2M]
dc.contributor.authorLEBLANC, Catherine
dc.date.issued2021-05
dc.identifier.issn0265-931X
dc.description.abstractEn129I is one of the main radioisotopes of iodine derived from the nuclear fuel cycle that can be found sustainably in the environment due to its long half-life. In coastal marine environment, brown macroalgae, such laminariales (or kelps), are known to naturally feature highest rates of iodine accumulation, and to be an important source of biogenic volatile iodinated compounds released to the atmosphere. These seaweeds are therefore likely to be significantly marked by but also potential vectors of radioactive iodine. In order to better understand the chemical and isotopic speciation of iodine in brown algal tissues, we combined mass spectrometry-based imaging approaches in natural samples of Laminaria digitata young sporophytes, collected at two different locations along the south coast of the English Channel (Roscoff and Goury). Laser desorption ionization (LDI) and desorption electrospray-ionization techniques (DESI), coupled with mass spectrometry, confirmed the predominance of inorganic I− species on the surface of fresh algae, and a peripheral iodine localization when applied on micro-sections. Moreover, radioactive isotope 129I was not detected on plantlet surface or in stipe sections of algal samples collected near Roscoff but was detected in L. digitata samples collected at Goury, near La Hague, where controlled liquid radioactive discharges from the ORANO La Hague reprocessing plant occur. At the subcellular scale, cryo-fixed micro-sections of algal blade samples from both sites were further analyzed by secondary ion mass spectrometry (nano-SIMS), leading to similar results. Even if the signal detected for 129I was much weaker than for 127I in samples from Goury, the chemical imaging revealed some differences in extracellular distribution between radioactive and stable iodine isotopes. Altogether LDI and nano-SIMS are complementary and powerful techniques for the detection and localization of iodine isotopes in algal samples, and for a better understanding of radioactive and stable iodine uptake mechanisms in the marine environment.
dc.language.isoen
dc.publisherElsevier
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/
dc.subject.enRadioactive iodine
dc.subject.enChemical speciation
dc.subject.enAlga
dc.subject.enIsotopic imaging
dc.subject.enMass spectrometry
dc.title.enMass spectrometry – based imaging techniques for iodine-127 and iodine-129 detection and localization in the brown alga Laminaria digitata
dc.typeArticle de revue
dc.identifier.doi10.1016/j.jenvrad.2021.106552
dc.subject.halSciences du Vivant [q-bio]/Ecologie, Environnement
dc.subject.halSciences de l'environnement/Ingénierie de l'environnement
bordeaux.journalJournal of Environmental Radioactivity
bordeaux.page106552
bordeaux.volume231
bordeaux.peerReviewedoui
hal.identifierhal-03151894
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03151894v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Environmental%20Radioactivity&rft.date=2021-05&rft.volume=231&rft.spage=106552&rft.epage=106552&rft.eissn=0265-931X&rft.issn=0265-931X&rft.au=LEBEAU,%20Diane&LEROY,%20Nathalie&DOIZI,%20Denis&WU,%20Ting-Di&GUERQUIN-KERN,%20Jean-Luc&rft.genre=article


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