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  1. Article ; Online: Contrasted redox-dependent structural control on Fe isotope fractionation during its adsorption onto and assimilation by heterotrophic soil bacteria.

    González, Aridane G / Poitrasson, Franck / Jiménez-Villacorta, Felix / Shirokova, Liudmila S / Pokrovsky, Oleg S

    Environmental science. Processes & impacts

    2024  Volume 26, Issue 2, Page(s) 344–356

    Abstract: Despite the importance of structural control on metal stable isotope fractionation in inorganic and abiotic systems, the link between metal structural changes and related isotopic fractionation during reactions with organic surfaces and live cells ... ...

    Abstract Despite the importance of structural control on metal stable isotope fractionation in inorganic and abiotic systems, the link between metal structural changes and related isotopic fractionation during reactions with organic surfaces and live cells remains poorly established. We conducted reversible adsorption of Fe(II) and Fe(III) on the surface of exopolysaccharide (EPS)-rich and EPS-poor
    MeSH term(s) Ferric Compounds/chemistry ; Adsorption ; Soil ; Iron/chemistry ; Isotopes ; Metals ; Bacteria/metabolism ; Water ; Ferrous Compounds ; Oxidation-Reduction
    Chemical Substances Ferric Compounds ; Soil ; Iron (E1UOL152H7) ; Isotopes ; Metals ; Water (059QF0KO0R) ; Ferrous Compounds
    Language English
    Publishing date 2024-02-21
    Publishing country England
    Document type Journal Article
    ZDB-ID 2703814-2
    ISSN 2050-7895 ; 2050-7887
    ISSN (online) 2050-7895
    ISSN 2050-7887
    DOI 10.1039/d3em00332a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Silicon Isotope Geochemistry

    Poitrasson, Franck

    2017  

    Abstract: In contrast to many other stable isotopes of the elements discussed in this book, those of silicon are not strictly speaking “Non-raditional Stable Isotopes” because they have been studied for more than 60 years. After the pioneering works of Reynolds ... ...

    Abstract In contrast to many other stable isotopes of the elements discussed in this book, those of silicon are not strictly speaking “Non-raditional Stable Isotopes” because they have been studied for more than 60 years. After the pioneering works of Reynolds and Verhoogen (1953) and Allenby (1954), a steady increase in silicon isotope studies of geological materials has led to a substantial corpus of data. These data were compiled by Ding et al. (1996) alongside new measurements that, collectively, included over a thousand samples of rocks, minerals, waters and biological materials. Most of these data were produced using the well established method of gas source mass spectrometry after sample decomposition and silicon purification via fluorination techniques.As for many non-traditional stable isotopes, silicon isotope research has flourished with the advent of second generation of multicollector plasma source mass spectrometers (MC–ICP–MS). These instruments eliminated the requirement of hazardous gaseous fluorine sample preparation methods while permitting improved analytical precision in both wet plasma (De La Rocha 2002) and in dry plasma (Cardinal et al. 2003). Subsequent analytical developments involving high mass resolution MC–ICP–MS combined with improved silicon purification methods (Georg et al. 2006) made this analytical technique more robust and precise enough to study even the subtle silicon isotope variations produced during high temperature geological processes (Savage et al. 2014).
    Subject code 621
    Language English
    Publishing date 2017-01-31
    Publisher Mineralogical Society of America
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Geochemistry. Probes of the ancient and the inaccessible.

    Poitrasson, Franck

    Science (New York, N.Y.)

    2009  Volume 323, Issue 5916, Page(s) 882–883

    Language English
    Publishing date 2009-02-13
    Publishing country United States
    Document type Comment ; Journal Article
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.1169281
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book: Iron isotopes

    Poitrasson, Franck

    (Advances in isotope geochemistry)

    2009  

    Author's details edited by Franck Poitrasson
    Series title Advances in isotope geochemistry
    Language English
    Size 1 v., ill (some col.), 24cm
    Publisher Springer
    Publishing place Berlin ;London
    Document type Book
    ISBN 3540784764 ; 9783540784760
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  5. Article: Potential use of Fe isotopes for ancient non-ferrous metals tracing through the example of a lead-silver production site (Imiter mine, Anti-Atlas, Morocco)

    Milot, Jean / Baron, Sandrine / Poitrasson, Franck

    Journal of archaeological science. 2018 Oct., v. 98

    2018  

    Abstract: Determining the provenance of non-ferrous metals is a major issue in archaeology and history. The classical method using Pb isotopes shows several limitations, and new isotopic tracers need to be developed in archaeometallurgy. Recently, Fe isotopes were ...

    Abstract Determining the provenance of non-ferrous metals is a major issue in archaeology and history. The classical method using Pb isotopes shows several limitations, and new isotopic tracers need to be developed in archaeometallurgy. Recently, Fe isotopes were found to be promising for iron metal tracing. In this context, we evaluated the pertinence of Fe isotopes as a new tool for provenance studies of non-ferrous metals. We collected slag and furnace lining samples from the Imiter silver mine in Morocco (Anti-Atlas), where many archaeological remains attest ancient lead-silver production. Their mineralogical composition was investigated by optical microscopic observations, SEM-EDS and EPMA. Besides, we measured both Pb and Fe isotope compositions of these samples by high resolution MC-ICP-MS after wet sample decomposition and purification chemistry. The occurrence of Ag, Pb, Cu and Ag/Pb metallic beads in the slag samples and their high Fe content suggests that these metallurgical materials result from the exploitation of Ag-rich polymetallic ores associated with gossan formations. Isotopic analyses of these slags highlighted their heterogeneous Pb isotope compositions and homogeneous Fe isotope composition. This points to the exploitation of two distinct ore sources with different Pb but similar Fe isotope compositions, despite the Fe isotope variability often encountered in metallic ores worldwide. Hence, Fe isotopes provide a complementary approach to trace lead-silver products from Imiter. Overall, the combination of Pb and Fe isotope analyses constitutes a promising method for further provenance investigations of non-ferrous metals.
    Keywords archaeology ; chemistry ; copper ; energy-dispersive X-ray analysis ; furnaces ; iron ; isotope labeling ; isotopes ; lead ; provenance ; scanning electron microscopy ; silver ; slags ; Morocco
    Language English
    Dates of publication 2018-10
    Size p. 22-33.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 1468969-8
    ISSN 0305-4403
    ISSN 0305-4403
    DOI 10.1016/j.jas.2018.07.004
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Investigation of Fe isotope systematics for the complete sequence of natural and metallurgical processes of Ni lateritic ores: Implications for environmental source tracing

    Ratié, Gildas / Garnier, Jérémie / Vieira, Lucieth Cruz / Araújo, Daniel F / Komárek, Michael / Poitrasson, Franck / Quantin, Cécile

    Applied geochemistry. 2021 Apr., v. 127

    2021  

    Abstract: Metal isotopes are versatile pollutant source trackers, but biogeochemical processes can overprint or alter the original source isotopic fingerprint and thus hinder contamination tracing. Here, we explore Fe isotope systematics for the complete range of ... ...

    Abstract Metal isotopes are versatile pollutant source trackers, but biogeochemical processes can overprint or alter the original source isotopic fingerprint and thus hinder contamination tracing. Here, we explore Fe isotope systematics for the complete range of natural and metallurgical processes related to Ni lateritic ores from Barro Alto, Brazil, to assess its potential as a tracer in polluted lateritic soil contexts developed in an ultramafic system.The homogeneous δ⁵⁷Fe values from protolith to soil confirmed that no significant Fe isotopic variation occurred during the formation of the deep lateritic profile. In addition, no Fe isotopic fractionation was found during the smelting process. Although the δ⁵⁷Fe values resulting from mining activities fall within the range of terrestrial sample signatures, the conservation of the δ⁵⁷Fe values from the ores to the by-products is an advantage for tracing anthropogenic sources when (i) the pyrometallurgical plant uses feeding material with Fe ores imported from other geological formations exhibiting different δ⁵⁷Fe values and/or (ii) the by-products are transported or dispersed to other locations with different δ⁵⁷Fe signatures in the topsoil.
    Keywords isotope fractionation ; isotope labeling ; isotopes ; laterites ; pollutants ; topsoil ; Brazil
    Language English
    Dates of publication 2021-04
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 1499242-5
    ISSN 0883-2927
    ISSN 0883-2927
    DOI 10.1016/j.apgeochem.2021.104930
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Iron isotopes reveal distinct dissolved iron sources and pathways in the intermediate versus deep Southern Ocean.

    Abadie, Cyril / Lacan, Francois / Radic, Amandine / Pradoux, Catherine / Poitrasson, Franck

    Proceedings of the National Academy of Sciences of the United States of America

    2017  Volume 114, Issue 5, Page(s) 858–863

    Abstract: As an essential micronutrient, iron plays a key role in oceanic biogeochemistry. It is therefore linked to the global carbon cycle and climate. Here, we report a dissolved iron (DFe) isotope section in the South Atlantic and Southern Ocean. Throughout ... ...

    Abstract As an essential micronutrient, iron plays a key role in oceanic biogeochemistry. It is therefore linked to the global carbon cycle and climate. Here, we report a dissolved iron (DFe) isotope section in the South Atlantic and Southern Ocean. Throughout the section, a striking DFe isotope minimum (light iron) is observed at intermediate depths (200-1,300 m), contrasting with heavier isotopic composition in deep waters. This unambiguously demonstrates distinct DFe sources and processes dominating the iron cycle in the intermediate and deep layers, a feature impossible to see with only iron concentration data largely used thus far in chemical oceanography. At intermediate depths, the data suggest that the dominant DFe sources are linked to organic matter remineralization, either in the water column or at continental margins. In deeper layers, however, abiotic non-reductive release of Fe (desorption, dissolution) from particulate iron-notably lithogenic-likely dominates. These results go against the common but oversimplified view that remineralization of organic matter is the major pathway releasing DFe throughout the water column in the open ocean. They suggest that the oceanic iron cycle, and therefore oceanic primary production and climate, could be more sensitive than previously thought to continental erosion (providing lithogenic particles to the ocean), particle transport within the ocean, dissolved/particle interactions, and deep water upwelling. These processes could also impact the cycles of other elements, including nutrients.
    Language English
    Publishing date 2017-01-31
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.1603107114
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    Zs.A 1148: Show issues Location:
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  8. Book ; Conference proceedings: Chemistry and physics of accessory minerals

    Poitrasson, Franck

    crystallisation, transformation and geochronological applications ; [conclusion of a symposium (J6) held during the last European Union of Geosciences XI meeting, Strasbourg, 8 - 12 April 2001]

    (Chemical geology : Special issue ; 191.2002,1/3)

    2002  

    Institution European Union of Geosciences
    Event/congress Meeting. European Union of Geosciences <Symposium J6> (11, 2001.04.08-12, Strasbourg)
    Author's details guest ed.: F. Poitrasson
    Series title Chemical geology : Special issue ; 191.2002,1/3
    Language English
    Size 255 S
    Publisher Elsevier
    Publishing place Amsterdam u.a.
    Document type Book ; Conference proceedings
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  9. Article ; Online: Effects of different water storage procedures on the dissolved Fe concentration and isotopic composition of chemically contrasted waters from the Amazon River Basin.

    Mulholland, Daniel S / Poitrasson, Franck / Boaventura, Geraldo R

    Rapid communications in mass spectrometry : RCM

    2015  Volume 29, Issue 21, Page(s) 2102–2108

    Abstract: Rationale: Although recent studies have investigated the Fe isotopic composition of dissolved, colloidal and particulate phases from continental and oceanic natural waters, few efforts have been made to evaluate whether water sample storage and the ... ...

    Abstract Rationale: Although recent studies have investigated the Fe isotopic composition of dissolved, colloidal and particulate phases from continental and oceanic natural waters, few efforts have been made to evaluate whether water sample storage and the separation of different pore-size fractions through filtration can cause any change to the Fe isotopic compositions. The present study investigates the possible biases introduced by different water storage conditions on the dissolved Fe concentration and isotopic composition of chemically different waters.
    Methods: Water samples were collected from an organic-rich river and from mineral particulate-rich rivers. Filtered and unfiltered water samples were stored either at room temperature or frozen at -18°C in order to assess possible biases due to (i) different water storage temperature, and (ii) storage of bulk (unfiltered) vs filtered water. Iron isotope measurements were performed by Multicollector Inductively Coupled Plasma Mass Spectrometry with a Thermo Electron Neptune instrument, after Fe purification using anion-exchange resins.
    Results: Our data reveal that bulk water storage at room temperature without filtration produces minor changes in the dissolved Fe isotopic composition of mineral particulate-rich waters, but significant isotopic composition changes in organic-rich waters. In both cases, however, the impact of the different procedures on the Fe concentrations was strong. On the other hand, the bulk water stored frozen without filtration produced more limited changes in the dissolved Fe concentrations, and also on isotopic compositions, relative to the samples filtered in the field. The largest effect was again observed for the organic-rich waters.
    Conclusions: These findings suggest that a time lag between water collection and filtration may cause isotopic exchanges between the dissolved and particulate Fe fractions. When it is not possible to filter the samples in the field immediately after collection, the less detrimental approach is to freeze the bulk water sample until filtration, to reduce isotopic artifacts.
    MeSH term(s) Brazil ; Chemistry Techniques, Analytical/methods ; Filtration ; Fresh Water/chemistry ; Iron/chemistry ; Iron Isotopes/chemistry ; Rivers/chemistry ; Solubility
    Chemical Substances Iron Isotopes ; Iron (E1UOL152H7)
    Language English
    Publishing date 2015-11-15
    Publishing country England
    Document type Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 58731-x
    ISSN 1097-0231 ; 0951-4198
    ISSN (online) 1097-0231
    ISSN 0951-4198
    DOI 10.1002/rcm.7368
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.A 3461: Show issues Location:
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  10. Article ; Online: Iron Isotope Fractionation during Bio- and Photodegradation of Organoferric Colloids in Boreal Humic Waters.

    Oleinikova, Olga V / Poitrasson, Franck / Drozdova, Olga Yu / Shirokova, Liudmila S / Lapitskiy, Sergey A / Pokrovsky, Oleg S

    Environmental science & technology

    2019  Volume 53, Issue 19, Page(s) 11183–11194

    Abstract: Biodegradation and photolysis of dissolved organic matter (DOM) in boreal high-latitude waters are the two main factors controlling not only the aquatic fluxes and residence time of carbon but also metal nutrients associated with DOM such as Fe. The DOM ... ...

    Abstract Biodegradation and photolysis of dissolved organic matter (DOM) in boreal high-latitude waters are the two main factors controlling not only the aquatic fluxes and residence time of carbon but also metal nutrients associated with DOM such as Fe. The DOM is usually present in the form of organic and organomineral colloids, which also account for the majority of dissolved Fe. Here, we use the stable Fe isotope approach to unravel the processes controlling Fe behavior during bio- and photodegradation of colloids in boreal Fe- and DOM-rich humic waters (a stream and a fen). The adsorption of Fe colloids onto heterotrophic bacteria
    MeSH term(s) Colloids ; Ferric Compounds ; Iron Isotopes ; Metals ; Photolysis
    Chemical Substances Colloids ; Ferric Compounds ; Iron Isotopes ; Metals
    Language English
    Publishing date 2019-09-17
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5851
    ISSN (online) 1520-5851
    DOI 10.1021/acs.est.9b02797
    Database MEDical Literature Analysis and Retrieval System OnLINE

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