Article
Environmental Sciences
Li Li, Duc Huy Dang, Xiaojing Wang, Jihua Liu, Yonghua Wu, Aimei Zhu, Xuefa Shi
Summary: The study revealed high concentrations of dissolved iron and active Fe, Mo, and U in sediment cores in the hydrothermal field. These atypical geochemical features are likely driven by reactive iron oxides delivered from the hydrothermal vents, leading to significant upward benthic fluxes of iron and molybdenum.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geochemistry & Geophysics
S. Bruggmann, S. Severmann, J. McManus
Summary: Concentrations and isotope ratios of chromium (Cr) in marine sediment can be used to reconstruct ocean biogeochemical conditions. The study examines the differences in Cr concentrations between oxic and anoxic sediments, finding that Cr concentrations are lower in oxic sediments. It also highlights the strong dependence of Cr on sedimentary redox conditions and biological productivity.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Environmental Sciences
Xiaojing Wang, Li Li, Yijun Ren, Peng Cao, Aimei Zhu, Jihua Liu, Xuefa Shi
Summary: Thirteen short sediment cores were collected from Bohai Sea, Yellow Sea, and Changjiang Estuary in China to study the early diagenesis of redox sensitive metals (RSMs) in sediment. The recycling process of certain RSMs was closely correlated with each other and influenced by organic carbon oxidation rates. The accumulation of U was significant in the study region, especially in the Yellow River and Changjiang River input, suggesting that these sediments serve as important U sinks.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geochemistry & Geophysics
Matthew O. Clarkson, Rick Hennekam, Tim C. Sweere, Morten B. Andersen, Gert-Jan Reichart, Derek Vance
Summary: The interpretation of local redox indicators in marine sediments relies on their preservation, as they are susceptible to diagenetic alteration. Authigenic uranium enrichments and their isotope signatures are used to infer redox conditions, but can be affected by oxidative diagenetic disturbance. The preservation of authigenic uranium is explored in sediment samples from the Eastern Mediterranean Sea, to provide accurate reconstructions of benthic de-oxygenation.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Yan Yuan, Tianyu Chen, Feifei Zhang, Yuanyuan Liu, Guolin Xiong, Guang-Yi Wei, Tais W. Dahl, Wen Yan, Hong-Fei Ling, Hai Cheng, Shu-Zhong Shen
Summary: The uranium isotope ratio in marine carbonates is an important tool for reconstructing past oceanic redox conditions. However, diagenetic processes may complicate this proxy by introducing isotopically heavy uranium into the carbonates. This study quantifies the valence states of trace amounts of uranium in geological carbonate samples and finds that modern coral carbonates faithfully record uranium from seawater. Surprisingly, drill core samples from a modern coral carbonate platform show a significant positive correlation between a specific valence state of uranium and the uranium isotope ratio, suggesting the presence of this valence state in marine carbonates and its influence on the uranium isotope ratio. The study suggests that coupled valence and isotope analyses of uranium in marine carbonates could provide critical constraints for reconstructing marine redox evolution.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Robert Klaebe, Peter Swart, Robert Frei
Summary: The study investigates the heterogeneity of 853Cr values on a modern marine carbonate platform and compares new 853Cr values from carbonate sediments to modern carbonate sediments accumulating on the platform. The variability in 853Cr values is found to be related to changes in sediment composition and mineralogy, rather than fluctuations in water column redox conditions.
Article
Environmental Sciences
Mahalakshmi Mathivanan, Chidambaram Sabarathinam, Prasanna Mohan Viswanathan, Venkatramanan Senapathi, Devaraj Nadesan, Gunarani Gunaseelan Indrani, Gnanasekar Malaimegu, Sahoo Sunil Kumar
Summary: The study revealed high uranium concentrations in groundwater in the semiarid regions of southern India, especially during the post monsoon season. Uranium primarily existed in the form of U3O8 and was associated with high pH values. Redox conditions were identified as the main process facilitating the release mechanism of uranium.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Environmental
Spencer J. Washburn, Joel D. Blum, Laura C. Motta, Bridget A. Bergquist, Peter Weiss-Penzias
Summary: The study found that the isotopic composition of mercury in coastal California fogwater is relatively consistent and does not show spatial trends, similar to the isotopic composition of precipitation. Photoreduction mechanisms play a significant role in controlling the odd-MIF isotopic composition of atmospheric mercury wet deposition, highlighting the importance of understanding the processes governing atmospheric mercury deposition.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2021)
Article
Environmental Sciences
Anja Reckhardt, Stephan L. Seibert, Tobias Holt, Janis Ahrens, Melanie Beck, Gudrun Massmann, Hans-Jurgen Brumsack
Summary: The study revealed the presence of various redox-sensitive metals in freshwater lenses, where their concentrations are influenced by biogeochemical processes. Additionally, the age and redox characteristics of groundwater are linked to metal concentrations. The sources, removal, and transformation processes of metals differ significantly in different redox environments.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Oceanography
Liqin Duan, Jinming Song, Xuegang Li, Huamao Yuan
Summary: This study evaluates the migration and removal of redox sensitive elements (RSEs) at the sediment-water interface (SWI) off the Changjiang Estuary by examining the porewater and solid RSEs. The concentrations of porewater and solid RSEs decrease with depth, and the removal of Mo is mediated by Fe-S phase while the removal of U is microbial-mediated reduction. The peaks of dissolved nitrate, Fe2+ and acid volatile sulfur (AVS) correspond to the downward removal of V, U and Mo, and the upward shift of RSE peaks in porewater reflects the occurrence of hypoxia in summer.
CONTINENTAL SHELF RESEARCH
(2023)
Article
Geology
Brian Jones, Simone Booker
Summary: The rare earth elements (REEs) in limestone and dolostone formations on isolated oceanic islands were found to originate from the seawater and were influenced by diagenetic processes. The distribution of REEs varied among different formations, with modern sediments having higher REE concentrations compared to older formations. The correlation between REEs and other elements differed between sediments and limestone/dolostone formations. The study also found that the distribution coefficients of REEs in modern Cayman corals were similar to corals in other parts of the world.
SEDIMENTARY GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Jack G. Murphy, Anne-Sofie C. Ahm, Peter K. Swart, John A. Higgins
Summary: The records of lithium isotopic composition in seawater preserved in shallow-marine carbonate sediments are valuable for studying the links between silicate weathering, clay formation, global carbon cycle, and Earth's climate over geological time. This study presents measurements of lithium isotopic composition in Neogene shallow-marine carbonates and demonstrates the effects of mineralogy and diagenetic alteration on the variability of bulk sediment δ Li-7 values. The findings suggest that robust 'snapshots' of seawater δ Li-7 values in the past can be obtained from shallow-water marine carbonate sediments.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geology
N. O. E. L. P. JAMES, Y. V. O. N. N. E. BONE
Summary: The Coorong Coastal Plain in South Australia consists of uplifted Pleistocene beach-dune formations, with older corridors poorly understood and more recent Holocene lakes extensively studied. The study reveals different chemical compositions of geological formations at different ages as time progresses.
Article
Geosciences, Multidisciplinary
Benjamin W. Johnson, Colin Mettam, Simon W. Poulton
Summary: The history of the nitrogen cycle on Earth is closely linked to the redox evolution of the surface environment. Interpretation of nitrogen isotopic analyses in past environments requires linking with redox-sensitive proxies. Combining N isotope and redox analyses is essential to interpret biologic isotopic signals during times of dynamic redox in the ocean-atmosphere system.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
Chadlin M. Ostrander, Sune G. Nielsen, Hayley J. Gadol, Luciana Villarroel, Scott D. Wankel, Tristan J. Horner, Jerzy Blusztajn, Colleen M. Hansel
Summary: Thallium (Tl) isotopes serve as a valuable tool for studying the history of molecular oxygen in seawater. Understanding the modern Tl isotope cycle is crucial for its application, especially in anoxic environments. This study found significant variability in Tl isotopes in short timeframes and observed the association of Tl with sulfide and other metals. The sediment data revealed limited isotopic variability, indicating the ability of sediments to capture the Tl isotope composition of contemporary waters.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Biodiversity Conservation
Alice C. A. Blanckaert, Dario Omanovic, Maoz Fine, Renaud Grover, Christine Ferrier-Pages
Summary: Climate change-induced increase in seawater temperature has caused coral bleaching, but corals in the northern Red Sea show tolerance due to the frequent dust storms that supply essential bioelements. Dust deposition enhances photosynthesis and metal bioaccumulation in corals, highlighting its role in sustaining coral productivity in the Red Sea reefs.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Mario Nikola Muzek, Franko Burcul, Dario Omanovic, Azra Dulovic, Sandra Svilovic, Ivica Blazevic
Summary: The effects of different adsorbents on the accumulation ability and glucosinolate content of cultivated rocket were studied, showing that the adsorbent type influences the copper and glucosinolate content.
Article
Chemistry, Multidisciplinary
Duc Huy Dang, Dario Omanovic, Alfonso Mucci, Wei Wang, Allison Sikma, Anique Chatzis
Summary: This study reports the platinum concentrations in the Estuary and Gulf of St. Lawrence (EGSL) during winter, and compares its behavior with that of cadmium. The results show that the dissolved platinum concentrations in the EGSL during winter are higher than in most river systems and marine endmembers, likely due to the geology of the drainage basins and atmospheric deposition. In addition, the mixing behavior of platinum and cadmium in the surface waters of the EGSL during winter is near-conservative, while the concentrations increase in bottom waters, possibly due to various factors. This highlights the importance of considering winter and oxygen-depleted conditions in future platinum budget calculations.
Article
Engineering, Environmental
Aleksandar I. Goranov, Amanda M. Tadini, Ladislau Martin-Neto, Alberto C. C. Bernardi, Patricia P. A. Oliveira, Jose R. M. Pezzopane, Debora M. B. P. Milori, Stephane Mounier, Patrick G. Hatcher
Summary: Soil organic matter plays an important role in the global carbon and nitrogen cycles. Different sample preparation techniques for characterizing soil organic matter have been compared, and it was found that the analysis window of negative-mode ESI-FT-ICR-MS can be biased towards different groups of molecules. It was also observed that soil organic matter from soils and aquatic environments behave differently.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Biochemical Research Methods
Vinicius S. Santos, Bernardo R. Moura, Gustavo Metzker, Marinonio L. Cornelio, Odair P. Ferreira, Stephane J. L. Mounier, Houssam Hajjoul, Mauricio Boscolo, Marcia C. Bisinoti, Altair B. Moreira
Summary: This study investigates the enhancement of fluorescence intensity due to the interaction of a humic-like substance (HLS 1%) extracted from process water and Cd(II) ions. The results suggest a photoinduced charge transfer between Cd(II) ions and carboxylic acid groups in HLS 1%, leading to an increase in fluorescence intensity and lifetime.
JOURNAL OF FLUORESCENCE
(2022)
Article
Environmental Sciences
Nicolas Layglon, Veronique Lenoble, Louis Longo, Sebastien D'Onofrio, Stephane Mounier, Jean-Ulrich Mullot, Davide Sartori, Dario Omanovic, Cedric Garnier, Benjamin Misson
Summary: This study compares the kinetics of cadmium remobilization and the amplitude of its transfers with different marine sediments. The results show that the process of cadmium re-dissolution is highly reproducible. The intensity of sediment resuspension impacts the amplitude of cadmium remobilization, potentially exceeding the maximum allowable cadmium concentration set by the European Union Water Framework Directive.
MARINE POLLUTION BULLETIN
(2022)
Article
Plant Sciences
Flavia Dory, Laurent Cavalli, Evelyne Franquet, Stephane Mounier, Patrick Hohener, Benjamin Misson, Mathieu Martin, Quentin Arnault, Thierry Tatoni, Celine Bertrand
Summary: This study analyzed the physical, chemical, and biological data of a high-altitude oligotrophic lake during different periods of the year and found seasonal shifts in the relationship between dissolved organic matter properties and plankton community traits. The research suggests that climate change will alter the control exerted by phytoplankton over bacterioplankton in high-altitude lakes.
JOURNAL OF ECOLOGY
(2023)
Article
Environmental Sciences
Carla Pereira De Morais, Diego Victor Babos, Vinicius Camara Costa, Jordan Brizi Neris, Gustavo Nicolodelli, Milene Corso Mitsuyuki, Frederico Fabio Mauad, Stephane Mounier, Debora Marcondes Bastos Pereira Milori
Summary: Double pulse laser-induced breakdown spectroscopy (DP LIBS) has been studied for the quantitative analysis of trace elements in sediments. Different spectral treatments and calibration strategies were investigated to improve the accuracy of determinations. The developed models showed satisfactory sensitivity and precision for the quantification of these potentially toxic elements, allowing for a partial ecological risk assessment of the sediments.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Geochemistry & Geophysics
Amanda M. Tadini, Gustavo Nicolodelli, Houssam Hajjoul, DeboraM. B. P. Milori, Stephane Mounier
Summary: This study evaluated the molecular properties of humic and fulvic acid from Amazon soil and found that the humification index is dependent on fluorophores' ratio in soils with and without Cu(II) ions. Results also showed the presence of static quenching and suggested that fluorescence suppression alters the molecular properties of humic fractions with the addition of Cu(II) ions.
APPLIED GEOCHEMISTRY
(2022)
Article
Environmental Sciences
Damir Kapetanovic, Irena Vardic Smrzlic, Snjezana Kazazic, Dario Omanovic, Neven Cukrov, Ana-Marija Cindric, Ana Rapljenovic, Lorena Peric, Karla Orlic, Tatjana Mijosek, Zuzana Redzovic, Ana Gavrilovic, Tena Radocaj, Vlatka Filipovic Marijic
Summary: The study evaluated the cultivable microbiota associated with plastic litter collected in the south-eastern Adriatic Sea by commercial fishing trawlers, comparing it with the microbiota in seawater and sediment. The results showed that the microbiota on plastic litter in the sea is different from that in the surrounding seawater and sediment. Vibrio abundance was found to be higher on plastic litter compared to seawater and sediment. This study provides valuable information on the cultivable microbiota associated with plastic litter and acts as a baseline for future research.
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
Dario Omanovic, Sasa Marcinek, Chiara Santinelli
Summary: Fluorescence excitation-emission matrices (EEMs) are a useful tool for studying organic matter in water systems. However, the interpretation of EEMs requires appropriate software. TreatEEM is a non-commercial software that provides comprehensive treatment and analysis of EEMs with a user-friendly interface.
Article
Geochemistry & Geophysics
Jose L. Clabel Huaman, Amanda Maria Tadini, Giorgio Saverio Senesi, Stephane Mounier, Debora M. B. P. Milori, Gustavo Nicolodelli
Summary: This study investigated the elemental and molecular composition of Amazon soil profiles using laser-induced breakdown spectroscopy (LIBS), Raman spectroscopy, and fluorescence spectroscopy. LIBS detected emission lines from various elements, while fluorescence analysis confirmed that carbon mainly accumulated in the transition horizon as humified organic matter. Raman peaks at 465 cm(-1) and 800 cm(-1) corresponded to stretching and bending modes of Si-O and Si-OH bonds, respectively. The combined use of these spectroscopic techniques proved to be a promising approach for studying Amazon soils.
Article
Environmental Sciences
Gael Durrieu, Nicolas Layglon, Sebastien D'Onofrio, Benjamin Oursel, Dario Omanovic, Cedric Garnier, Stephane Mounier
Summary: This study examines the input of trace elements from a small urban river in Toulon, France during both base flow and flood events. The findings indicate that flood events lead to an increase in dissolved and particulate trace element concentrations, as well as higher pollutant loading.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2023)
Article
Chemistry, Analytical
Sasa Marcinek, Josep Galceran, Irena Ciglenecki, Dario Omanovic
Summary: A new method called PB-HS, based on the influence of humic substances on the background current, was proposed for the determination of HS in natural waters. The method was discussed in detail and compared with other quantification methods. PB-HS showed slightly better sensitivity than classical spectrophotometry and had the advantage of not requiring any reagent addition and being applicable in a wide salinity range.
Article
Geochemistry & Geophysics
Zhen-Min Ge, Xiao-Long Huang, Wei Xie, Tobias W. Hofig, Fan Yang, Yang Yu, S. Khogenkumar Singh
Summary: The mantle source composition of the nascent oceanic crust in the central part of the Gulf of California has been investigated using basaltic glass samples. These samples show trace element patterns similar to enriched mid-ocean ridge basalts, suggesting that the nascent oceanic crust in the Guaymas Basin might be generated through partial melting of a depleted mantle source metasomatized by subducted slab materials.
Article
Geochemistry & Geophysics
Jean-Michel Brazier, Katja E. Goetschl, Martin Dietzel, Vasileios Mavromatis
Summary: This study estimated the distribution coefficient of Zn2+ between calcite/aragonite and reactive fluids and found that the growth rate strongly influences D-Zn(2+) in both minerals. Additionally, a linear correlation was found between D-Zn(2+) and the saturation degree of the reactive fluid.
Article
Geochemistry & Geophysics
Ming Lei, Michele Lustrino, Jifeng Xu, Zhiqiang Kang, Zhengfu Guo, Jianlin Chen
Summary: This study presents a comprehensive geochronological, mineralogical, and geochemical analysis of olivine leucitites in the Maiga area of southern Tibet, suggesting that these rocks originate from a carbonated peridotite mantle source and highlighting the possibility of carbonates being recycled deep into the mantle during continental subduction.
Article
Geochemistry & Geophysics
Yuntao Ye, Xiaomei Wang, Huajian Wang, Haifeng Fan, Zhigang Chen, Qingjun Guo, Ziteng Wang, Chaodong Wu, Donald E. Canfield, Shuichang Zhang
Summary: Phosphorus is an essential element for life and its cycle in the ocean is closely connected with the carbon and oxygen cycles. The study of phosphate oxygen isotopes can provide insights into various reactions related to phosphorus. By analyzing carbonate fluorapatite samples from the Mesoproterozoic Era in North China, it was found that the oxygen isotope values were lower compared to modern samples, indicating a warmer climate during that time period and a potential reason for the scarcity of phosphorite.
Article
Geochemistry & Geophysics
Vincent Busigny, Oanez Lebeau, Didier Jezeduel, Carine Chaduteau, Sean Crowe, Magali Ader
Summary: This study conducted high-precision Mo isotope research on hydrothermal metal sulfides from a porphyry copper deposit in Southwest China and found that different stages of mineralization have distinct Mo isotope compositions, providing valuable insights into the behavior of Mo isotopes in magmatic-hydrothermal systems.
Article
Geochemistry & Geophysics
Min Ji, Xiao-Ying Gao, Yong-Fei Zheng, Bing Gong
Summary: The study examines the anatectic mechanisms in the Himalayan orogen, finding that pressure and temperature control the reaction, while water content mainly affects the solid-phase composition. Dehydration and hydration melting likely occur at different depths in the crust. This research provides important insights into the melting processes in collisional orogens.
