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Hagelskjær O, Le Roux G, Liu R, Dubreuil B, Behra P, Sonke JE. The recovery of aerosol-sized microplastics in highly refractory vegetal matrices for identification by automated Raman microspectroscopy. Chemosphere 2023; 328:138487. [PMID: 37004825 DOI: 10.1016/j.chemosphere.2023.138487] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 12/12/2022] [Revised: 03/17/2023] [Accepted: 03/21/2023] [Indexed: 06/19/2023]
Abstract
Ombrotrophic peatlands are fed uniquely by atmospheric inputs and therefore have much potential as temporal archives of atmospheric microplastic (MP) deposition, yet the recovery and detection of MP within an almost purely organic matrix is challenging. This study presents a novel peat digestion protocol using sodium hypochlorite (NaClO) as a reagent for biogenic matrix removal. NaClO is more efficient than hydrogen peroxide (H2O2). By using purged air-assisted digestion, NaClO (50 vol%) reached 99% matrix digestion compared with 28% and 75% by H2O2 (30 vol%) and Fenton's reagent, respectively. At a concentration of 50 vol% NaClO did however chemically disintegrate small amounts (<10 mass %) of polyethylene terephthalate (PET) and polyamide (PA) fragments in the millimeter size range. Observation of PA6 in natural peat samples, while not found in the procedural blanks, questions whether PA is fully disintegrated by NaClO. The protocol was applied to three commercial sphagnum moss test samples, in which MP particles in the range of 0.8-65.4 μm were detected by Raman microspectroscopy. The MP mass% was determined at 0.012% corresponding to 129 thousand MP particles/g, of which 62% were smaller than 5 μm and 80% were smaller than 10 μm, yet were accountable for only 0.4% (500 ng) and 3.2% (4 μg) of the total mass of MP, respectively. These findings underline the importance of the identification of particles Ø < 5 μm when investigating atmospheric MP deposition. The MP counts were corrected for MP recovery loss and procedural blank contamination. MP spike recovery following the full protocol was estimated at 60%. The protocol offers an efficient way of isolating and pre-concentrating most aerosol sized MPs in large quantities of refractory vegetal matrices and enables the automated μRaman scanning of thousands of particles at a spatial resolution on the order of 1 μm.
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Affiliation(s)
- O Hagelskjær
- Laboratoire écologie Fonctionnelle et Environnement, Université de Toulouse, CNRS, Avenue de l'Agrobiopole, 31326, Toulouse, France; Géosciences Environnement Toulouse, CNRS UMR5563 - IRD UR 234, Université Paul Sabatier, 14 Avenue Edouard Belin, 31400, Toulouse, France.
| | - G Le Roux
- Laboratoire écologie Fonctionnelle et Environnement, Université de Toulouse, CNRS, Avenue de l'Agrobiopole, 31326, Toulouse, France
| | - R Liu
- Laboratoire écologie Fonctionnelle et Environnement, Université de Toulouse, CNRS, Avenue de l'Agrobiopole, 31326, Toulouse, France
| | - B Dubreuil
- Laboratoire de Chimie Agro-industrielle, LCA, Université de Toulouse, INRAE, 4 Allée Emile Monso, 31030, Toulouse Cedex, France
| | - P Behra
- Laboratoire de Chimie Agro-industrielle, LCA, Université de Toulouse, INRAE, 4 Allée Emile Monso, 31030, Toulouse Cedex, France
| | - J E Sonke
- Géosciences Environnement Toulouse, CNRS UMR5563 - IRD UR 234, Université Paul Sabatier, 14 Avenue Edouard Belin, 31400, Toulouse, France
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Allen S, Allen D, Baladima F, Phoenix VR, Thomas JL, Le Roux G, Sonke JE. Evidence of free tropospheric and long-range transport of microplastic at Pic du Midi Observatory. Nat Commun 2021; 12:7242. [PMID: 34934062 PMCID: PMC8692471 DOI: 10.1038/s41467-021-27454-7] [Citation(s) in RCA: 63] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Accepted: 11/05/2021] [Indexed: 11/16/2022] Open
Abstract
The emerging threat of atmospheric microplastic pollution has prompted researchers to study areas previously considered beyond the reach of plastic. Investigating the range of atmospheric microplastic transport is key to understanding the global extent of this problem. While atmospheric microplastics have been discovered in the planetary boundary layer, their occurrence in the free troposphere is relatively unexplored. Confronting this is important because their presence in the free troposphere would facilitate transport over greater distances and thus the potential to reach more distal and remote parts of the planet. Here we show evidence of 0.09-0.66 microplastics particles/m3 over 4 summer months from the Pic du Midi Observatory at 2877 meters above sea level. These results exhibit true free tropospheric transport of microplastic, and high altitude microplastic particles <50 µm (aerodynamic diameter). Analysis of air/particle history modelling shows intercontinental and trans-oceanic transport of microplastics illustrating the potential for global aerosol microplastic transport.
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Affiliation(s)
- S. Allen
- grid.11984.350000000121138138Centre for Water, Environment, Sustainability and Public Health (WESP), Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow, G11XJ UK ,grid.508721.9Laboratoire écologie fonctionnelle et environnement, Université de Toulouse, CNRS, Toulouse, France ,grid.6572.60000 0004 1936 7486School of Geography/Institute for Global Innovation, University of Birmingham, Birmingham, B15 2TT UK
| | - D. Allen
- grid.11984.350000000121138138Centre for Water, Environment, Sustainability and Public Health (WESP), Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow, G11XJ UK ,grid.508721.9Laboratoire écologie fonctionnelle et environnement, Université de Toulouse, CNRS, Toulouse, France
| | - F. Baladima
- grid.5676.20000000417654326Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, 38000 Grenoble, France
| | - V. R. Phoenix
- grid.11984.350000000121138138Centre for Water, Environment, Sustainability and Public Health (WESP), Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow, G11XJ UK
| | - J. L. Thomas
- grid.5676.20000000417654326Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, 38000 Grenoble, France
| | - G. Le Roux
- grid.508721.9Laboratoire écologie fonctionnelle et environnement, Université de Toulouse, CNRS, Toulouse, France
| | - J. E. Sonke
- grid.15781.3a0000 0001 0723 035XGéosciences Environnement Toulouse, CNRS/IRD/Université Paul Sabatier, Toulouse, 3 France
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Xu HM, He KL, Feng R, Shen ZX, Cao JJ, Liu SX, Ho KF, Huang RJ, Guinot B, Wang QY, Zhou JM, Shen MX, Xiao S, Zhou BH, Sonke JE. Metallic elements and Pb isotopes in PM 2.5 in three Chinese typical megacities: spatial distribution and source apportionment. Environ Sci Process Impacts 2020; 22:1718-1730. [PMID: 32672296 DOI: 10.1039/d0em00174k] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Heavy metal pollution in fine particulate matter (PM2.5) is a serious environmental and health concern in China, particularly during winter. Here, we detected 40 elements in 24 h integrated daily PM2.5 samples collected in January 2014 from three typical Chinese metropolises (Beijing, Changchun, and Chengdu) to reflect elemental spatial variations, local sources, and regional transport. The measured elemental concentrations in Changchun were 11.1% and 48.4% higher than those in Beijing and Chengdu, respectively. Thus, PM2.5 from Changchun exhibited high levels and diversity in the elemental profile (characterized by high concentrations of industrial emission elemental markers). The results of elemental ratios and Pb isotopes proved that, except for a coal combustion source, vehicular emissions contributed more to PM2.5 heavy metals in Beijing than in the other two cities; Changchun PM2.5 elements received large contributions from industrial sources, including iron and steel manufacturing, and automobile industry. Moreover, crustal dust from long-range transport of regional air masses from the northwest regions of China played a crucial role in determining elemental levels in Beijing and Changchun, accounting for more than 50% of source intensity. However, a specific dominant source was not determined in Chengdu; the contribution of anthropogenic dust, mainly from construction activities, needs to be paid attention in Chengdu eastern area. This study contributed to enhancing our understanding of elemental spatial distribution characteristics and sources and to setting more judicious standards and strategies for PM2.5 bound heavy metals in China.
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Affiliation(s)
- H M Xu
- Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an, China.
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Rosati G, Heimbürger LE, Melaku Canu D, Lagane C, Laffont L, Rijkenberg MJA, Gerringa LJA, Solidoro C, Gencarelli CN, Hedgecock IM, De Baar HJW, Sonke JE. Mercury in the Black Sea: New Insights From Measurements and Numerical Modeling. Global Biogeochem Cycles 2018; 32:529-550. [PMID: 29861543 PMCID: PMC5969270 DOI: 10.1002/2017gb005700] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Revised: 01/19/2018] [Accepted: 03/01/2018] [Indexed: 05/21/2023]
Abstract
Redox conditions and organic matter control marine methylmercury (MeHg) production. The Black Sea is the world's largest and deepest anoxic basin and is thus ideal to study Hg species along the extended redox gradient. Here we present new dissolved Hg and MeHg data from the 2013 GEOTRACES MEDBlack cruise (GN04_leg2) that we integrated into a numerical 1-D model, to track the fate and dynamics of Hg and MeHg. Contrary to a previous study, our new data show highest MeHg concentrations in the permanently anoxic waters. Observed MeHg/Hg percentage (range 9-57%) in the anoxic waters is comparable to other subsurface maxima in oxic open-ocean waters. With the modeling we tested for various Hg methylation and demethylation scenarios along the redox gradient. The results show that Hg methylation must occur in the anoxic waters. The model was then used to simulate the time evolution (1850-2050) of Hg species in the Black Sea. Our findings quantify (1) inputs and outputs of HgT (~31 and ~28 kmol yr-1) and MeHgT (~5 and ~4 kmol yr-1) to the basin, (2) the extent of net demethylation occurring in oxic (~1 kmol yr-1) and suboxic water (~6 kmol yr-1), (3) and the net Hg methylation in the anoxic waters of the Black Sea (~11 kmol yr-1). The model was also used to estimate the amount of anthropogenic Hg (85-93%) in the Black Sea.
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Affiliation(s)
- G. Rosati
- OGS, National Institute of Oceanography and Experimental Geophysics, OCE Research Section, ECHO GroupTriesteItaly
- Department of Life SciencesUniversity of TriesteTriesteItaly
| | - L. E. Heimbürger
- Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography UM 110MarseilleFrance
| | - D. Melaku Canu
- OGS, National Institute of Oceanography and Experimental Geophysics, OCE Research Section, ECHO GroupTriesteItaly
| | - C. Lagane
- Observatoire Midi‐Pyrénées, Laboratoire Géosciences Environnement Toulouse, CNRS/IRD/Université Paul‐SabatierToulouseFrance
| | - L. Laffont
- Observatoire Midi‐Pyrénées, Laboratoire Géosciences Environnement Toulouse, CNRS/IRD/Université Paul‐SabatierToulouseFrance
| | - M. J. A. Rijkenberg
- NIOZ, Royal Institute for Sea Research, department of GCOUtrecht UniversityDen BurgNetherlands
| | - L. J. A. Gerringa
- NIOZ, Royal Institute for Sea Research, department of GCOUtrecht UniversityDen BurgNetherlands
| | - C. Solidoro
- OGS, National Institute of Oceanography and Experimental Geophysics, OCE Research Section, ECHO GroupTriesteItaly
- ICTP, The Abdus Salam International Centre for Theoretical PhysicsTriesteItaly
| | - C. N. Gencarelli
- CNR, Institute of Atmospheric Pollution Research, Division of Rende, UNICAL‐PolifunzionaleRendeItaly
| | - I. M. Hedgecock
- CNR, Institute of Atmospheric Pollution Research, Division of Rende, UNICAL‐PolifunzionaleRendeItaly
| | - H. J. W. De Baar
- NIOZ, Royal Institute for Sea Research, department of GCOUtrecht UniversityDen BurgNetherlands
| | - J. E. Sonke
- Observatoire Midi‐Pyrénées, Laboratoire Géosciences Environnement Toulouse, CNRS/IRD/Université Paul‐SabatierToulouseFrance
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Bagnato E, Tamburello G, Avard G, Martinez-Cruz M, Enrico M, Fu X, Sprovieri M, Sonke JE. Mercury fluxes from volcanic and geothermal sources: an update. ACTA ACUST UNITED AC 2014. [DOI: 10.1144/sp410.2] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AbstractWe review the state of knowledge on global volcanogenic Hg emissions to the atmosphere and present new data from seven active volcanoes (Poás, Rincón de la Vieja, Turrialba, Aso, Mutnovsky, Gorely and Etna) and two geothermal fields (Las Pailas and Las Hornillas). The variability of Hg contents (c. 4–125 ng m−3) measured in gaseous emissions reflects the dynamic nature of volcanic plumes, where the abundances of volatiles are determined by the physical nature of degassing and variable air dilution. Based on our dataset and previous work, we propose that an average Hg/SO2 plume mass ratio of c. 7.8×10−6 (±1.5×10−6; 1 SE, n=13) is best representative of open-conduit quiescent degassing. Taking into account the uncertainty in global SO2 emissions, we infer a global volcanic Hg flux from persistent degassing of c. 76±30 t a−1. Our data are derived from active volcanoes during non-eruptive periods and we do not have any direct constraint on the Hg flux during periods of elevated SO2 flux associated with large-scale effusive or explosive eruptions. This suggests that the time-averaged Hg flux from these volcanoes is even larger if the eruptive contribution is considered. Conversely, closed-conduit degassing and geothermal emissions contribute modest amounts of Hg.
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Affiliation(s)
- E. Bagnato
- DiSTeM, University of Palermo,Via Archirafi, 36, 90123 Palermo, Italy
| | - G. Tamburello
- DiSTeM, University of Palermo,Via Archirafi, 36, 90123 Palermo, Italy
| | - G. Avard
- Observatorio Vulcanológico y Sismológico de Costa Rica, Universidad Nacional, 2346-3000 Heredia, Costa Rica
| | - M. Martinez-Cruz
- Observatorio Vulcanológico y Sismológico de Costa Rica, Universidad Nacional, 2346-3000 Heredia, Costa Rica
| | - M. Enrico
- Observatoire Midi-Pyrénées, CNRS-GET, 14, avenue Edouard Belin, 31400 Toulouse, France
| | - X. Fu
- Observatoire Midi-Pyrénées, CNRS-GET, 14, avenue Edouard Belin, 31400 Toulouse, France
| | - M. Sprovieri
- IAMC-CNR, Via del Mare 3, 91021 Torretta Granitola, Mazara del Vallo (TP), Italy
| | - J. E. Sonke
- Observatoire Midi-Pyrénées, CNRS-GET, 14, avenue Edouard Belin, 31400 Toulouse, France
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