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Lao IR, Feinberg A, Borduas-Dedekind N. Regional Sources and Sinks of Atmospheric Particulate Selenium in the United States Based on Seasonality Profiles. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:7401-7409. [PMID: 37146171 DOI: 10.1021/acs.est.2c08243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Selenium (Se) is an essential nutrient for humans and enters our food chain through bioavailable Se in soil. Atmospheric deposition is a major source of Se to soils, driving the need to investigate the sources and sinks of atmospheric Se. Here, we used Se concentrations from PM2.5 data at 82 sites from 1988 to 2010 from the Interagency Monitoring of Protected Visual Environments (IMPROVE) network in the US to identify the sources and sinks of particulate Se. We identified 6 distinct seasonal profiles of atmospheric Se, grouped by geographical location: West, Southwest, Midwest, Southeast, Northeast, and North Northeast. Across most of the regions, coal combustion is the largest Se source, with a terrestrial source dominating in the West. We also found evidence for gas-to-particle partitioning in the wintertime in the Northeast. Wet deposition is an important sink of particulate Se, as determined by Se/PM2.5 ratios. The Se concentrations from the IMPROVE network compare well to modeled output from a global chemistry-climate model, SOCOL-AER, except in the Southeast US. Our analysis constrains the sources and sinks of atmospheric Se, thereby improving the predictions of Se distribution under climate change.
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Affiliation(s)
- Isabelle Renee Lao
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
| | - Aryeh Feinberg
- Institute for Data, Systems, and Society, Massachusetts Institute of Technology, 50 Ames Street, Cambridge, Massachusetts 02142, United States
| | - Nadine Borduas-Dedekind
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
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Bueno M, Duval B, Tessier E, Romero-Rama A, Kortazar L, Fernández LÁ, de Diego A, Amouroux D. Selenium distribution and speciation in waters of pristine alpine lakes from central-western Pyrenees (France-Spain). ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2022; 24:1430-1442. [PMID: 35080575 DOI: 10.1039/d1em00430a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The speciation of both redox reactive and volatile selenium (Se) compounds, barely reported in pristine aquatic environments, has never been investigated in remote alpine lakes, considered as sensitive ecosystems to detect the effect of global change. This work presents an integrated investigation on Se distribution and speciation conducted in 20 high altitude pristine lakes from the central-western Pyrenees. Five seasonal sampling campaigns were carried out after snowmelt (June/July) and in early fall (October) for the period 2017-2019. Concentrations of total dissolved Se (TDSe) ranged from 7 to 78 ng L-1, with selenate being ubiquitously observed in most cases (median of 61% of TDSe). Selenite was only occasionally detected up to 4 ng L-1, therefore a fraction of TDSe was presumably in the forms of elemental Se(0) and/or selenides. Depth profiles obtained in different lakes showed the occurrence of such Se(-II, 0) pools in bottom hypoxic to anoxic waters. The production of volatile Se compounds presented a low median total concentration (TVSe) of 33 pg L-1 (range 3-120 pg L-1), mainly in the form of dimethylselenide in subsurface samples (median of 82% of TVSe). The Se concentration in lake waters was significantly correlated with the sulphate concentration (ρ = 0.93, p < 0.0001), demonstrating that it is influenced by erosion and dissolution of Se and S-enriched parent bedrocks. In addition, for Se depleted alpine lake-bedrock systems, long-range transport and wet atmospheric depositions represent a major source of Se for lake waters.
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Affiliation(s)
- Maïté Bueno
- Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, Institute of Analytical Sciences and Physical-Chemistry for the Environment and Materials - IPREM, Pau, France.
| | - Bastien Duval
- Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, Institute of Analytical Sciences and Physical-Chemistry for the Environment and Materials - IPREM, Pau, France.
- Department of Analytical Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), Sarriena Auzoa z/g, 48940 Leioa, Basque Country, Spain
| | - Emmanuel Tessier
- Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, Institute of Analytical Sciences and Physical-Chemistry for the Environment and Materials - IPREM, Pau, France.
| | - Andrea Romero-Rama
- Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, Institute of Analytical Sciences and Physical-Chemistry for the Environment and Materials - IPREM, Pau, France.
| | - Leire Kortazar
- Department of Analytical Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), Sarriena Auzoa z/g, 48940 Leioa, Basque Country, Spain
| | - Luís Ángel Fernández
- Department of Analytical Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), Sarriena Auzoa z/g, 48940 Leioa, Basque Country, Spain
- Plentziako Itsas Estazioa (PIE), University of the Basque Country (UPV/EHU), Areatza Pasealekua, 48620 Plentzia, Basque Country, Spain
| | - Alberto de Diego
- Department of Analytical Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), Sarriena Auzoa z/g, 48940 Leioa, Basque Country, Spain
- Plentziako Itsas Estazioa (PIE), University of the Basque Country (UPV/EHU), Areatza Pasealekua, 48620 Plentzia, Basque Country, Spain
| | - David Amouroux
- Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, Institute of Analytical Sciences and Physical-Chemistry for the Environment and Materials - IPREM, Pau, France.
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