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Riminucci F, Funari V, Ravaioli M, Capotondi L. Trace metals accumulation on modern sediments from Po river prodelta, North Adriatic Sea. Mar Pollut Bull 2022; 175:113399. [PMID: 35149315 DOI: 10.1016/j.marpolbul.2022.113399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 01/22/2022] [Accepted: 01/24/2022] [Indexed: 06/14/2023]
Abstract
Trace Metals (TMs: Pb, Zn, Cu, Cr, Cd, and Ni), major elements (Al and Fe) and radionuclides (210Pb/137Cs) investigations on EL-C01 sediment core provides new information on sedimentary regime and anthropogenic impacts during the last 175 years in the Po river prodelta area. The results allow to identify some TMs/Al peak in the upper part of the core, likely related to the major flood events of the Po river during the XXth century. Sediments deposited after the year 1900 exhibit a gradual increase of some TMs concentrations compared to pre-industrial era values. In particular, Pb, Zn, and Cu high contents are detected after the World War II and during the "Italian Economic Miracle" period. The decrease of heavy metal (Zn and Pb) contents from the second half of the 1980s is probably the effect of the Italian Law 319/76 and anti-pollution environmental policies concerning industrial and urban emitters.
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Affiliation(s)
- Francesco Riminucci
- Istituto di Scienze Marine-Consiglio Nazionale delle Ricerche ISMAR-CNR, Via P. Gobetti 101, 40129 Bologna, Italy; Consorzio Proambiente S.c.r.l., Tecnopolo Bologna CNR, Via Gobetti 101, 40129 Bologna, Italy
| | - Valerio Funari
- Istituto di Scienze Marine-Consiglio Nazionale delle Ricerche ISMAR-CNR, Via P. Gobetti 101, 40129 Bologna, Italy; Dipartimento di Biotecnologie Marine, Stazione Zoologica Anton Dohrn (SZN), Villa Comunale, 80121 Napoli, Italy.
| | - Mariangela Ravaioli
- Istituto di Scienze Marine-Consiglio Nazionale delle Ricerche ISMAR-CNR, Via P. Gobetti 101, 40129 Bologna, Italy
| | - Lucilla Capotondi
- Istituto di Scienze Marine-Consiglio Nazionale delle Ricerche ISMAR-CNR, Via P. Gobetti 101, 40129 Bologna, Italy
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Lefebvre P, Sabatier P, Mangeret A, Gourgiotis A, Le Pape P, Develle AL, Louvat P, Diez O, Reyss JL, Gaillardet J, Cazala C, Morin G. Climate-driven fluxes of organic-bound uranium to an alpine lake over the Holocene. Sci Total Environ 2021; 783:146878. [PMID: 33865129 DOI: 10.1016/j.scitotenv.2021.146878] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 03/26/2021] [Accepted: 03/28/2021] [Indexed: 06/12/2023]
Abstract
Uranium (U) isotopic signatures and concentration in sediments are widely used as paleo-redox proxies, as the behavior of U is often controlled by bottom water oxygenation. Here, we investigated the processes controlling U accumulation in the sediments of Lake Nègre (Mediterranean Alps, South-East France) over the past 9200 years. Exceptionally high natural U concentrations (350-1250 μg·g-1) allowed the measurement of U along with other elements by high-resolution X-Ray Fluorescence core-scanning. Weathering and erosion proxies (Ti content, Zr/Al and K/Ti ratios) indicate that sedimentary inputs were controlled by Holocene climatic variations. After a period of low erosion during the Holocene Climatic Optimum, a major regime shift was recorded at 4.2 kyr BP when terrigenous fluxes consistently increased until present with high sensitivity to centennial-scale climatic events. Sedimentary organic matter (OM) inputs were dominated by terrigenous OM from the catchment soils until 2.4 kyr BP, as attested by carbon to nitrogen (C/N) and bromine to organic carbon (Br/TOC) ratios. From 2.4 kyr BP to present, lake primary production and soils equally contributed to sedimentary OM. Uranium fluxes to the sediments were well correlated to terrigenous OM fluxes from 7 kyr BP to present, showing that U supply to the lake was controlled by U scavenging in the soils of the watershed followed by transport of U bound to detrital organic particles. Higher U/OM ratios before 7 kyr BP likely reflect the development of the upstream wetland. The fluctuations of U sedimentary inputs appear to be independent of bottom water oxygenation, as estimated from constant Fe/Mn ratios and δ238U isotopic signatures, and rather controlled by the production, erosion and sedimentation of terrigenous OM. This finding confirms that the use of U (and potentially other metals with high affinity to OM) concentrations alone should be used with caution for paleo-redox reconstructions.
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Affiliation(s)
- Pierre Lefebvre
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), UMR 7590, Sorbonne Université-CNRS-MNHN-IRD, Paris, France.
| | - Pierre Sabatier
- Univ Savoie Mont Blanc, CNRS, Edytem, UMR 5204, Chambéry, France
| | - Arnaud Mangeret
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV SEDRE, Fontenay-aux-Roses, France
| | - Alkiviadis Gourgiotis
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV SEDRE, Fontenay-aux-Roses, France
| | - Pierre Le Pape
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), UMR 7590, Sorbonne Université-CNRS-MNHN-IRD, Paris, France
| | | | - Pascale Louvat
- Université de Paris-Institut de Physique du Globe de Paris-CNRS, UMR 7154, Paris, France
| | - Olivier Diez
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV SEDRE, Fontenay-aux-Roses, France
| | - Jean-Louis Reyss
- Univ Savoie Mont Blanc, CNRS, Edytem, UMR 5204, Chambéry, France
| | - Jérôme Gaillardet
- Université de Paris-Institut de Physique du Globe de Paris-CNRS, UMR 7154, Paris, France
| | - Charlotte Cazala
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV SEDRE, Fontenay-aux-Roses, France
| | - Guillaume Morin
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), UMR 7590, Sorbonne Université-CNRS-MNHN-IRD, Paris, France
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