Methylmercury in environmental compartments of a hydroelectric reservoir in the Western Amazon, Brazil
Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate...
Ausführliche Beschreibung
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| Autor*in: |
Pestana, Inacio A. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2019transfer abstract |
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| Schlagwörter: |
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| Umfang: |
8 |
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| Übergeordnetes Werk: |
Enthalten in: MPI vs Fortran coarrays beyond 100k cores: 3D cellular automata - Shterenlikht, Anton ELSEVIER, 2019, chemistry, biology and toxicology as related to environmental problems, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:215 ; year:2019 ; pages:758-765 ; extent:8 |
| Links: |
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| DOI / URN: |
10.1016/j.chemosphere.2018.10.106 |
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ELV04461778X |
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| 245 | 1 | 0 | |a Methylmercury in environmental compartments of a hydroelectric reservoir in the Western Amazon, Brazil |
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| 520 | |a Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. | ||
| 520 | |a Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. | ||
| 650 | 7 | |a Sediment profile |2 Elsevier | |
| 650 | 7 | |a Mercury methylation |2 Elsevier | |
| 650 | 7 | |a Amazon hydroelectric reservoir |2 Elsevier | |
| 650 | 7 | |a Suspended particulate matter |2 Elsevier | |
| 650 | 7 | |a Aquatic macrophytes |2 Elsevier | |
| 700 | 1 | |a Bastos, Wanderley R. |4 oth | |
| 700 | 1 | |a Almeida, Marcelo G. |4 oth | |
| 700 | 1 | |a Mussy, Marilia H. |4 oth | |
| 700 | 1 | |a Souza, Cristina MM. |4 oth | |
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10.1016/j.chemosphere.2018.10.106 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001272.pica (DE-627)ELV04461778X (ELSEVIER)S0045-6535(18)31967-2 DE-627 ger DE-627 rakwb eng 004 620 VZ 54.25 bkl Pestana, Inacio A. verfasserin aut Methylmercury in environmental compartments of a hydroelectric reservoir in the Western Amazon, Brazil 2019transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. Sediment profile Elsevier Mercury methylation Elsevier Amazon hydroelectric reservoir Elsevier Suspended particulate matter Elsevier Aquatic macrophytes Elsevier Bastos, Wanderley R. oth Almeida, Marcelo G. oth Mussy, Marilia H. oth Souza, Cristina MM. oth Enthalten in Elsevier Science Shterenlikht, Anton ELSEVIER MPI vs Fortran coarrays beyond 100k cores: 3D cellular automata 2019 chemistry, biology and toxicology as related to environmental problems Amsterdam [u.a.] (DE-627)ELV002112701 volume:215 year:2019 pages:758-765 extent:8 https://doi.org/10.1016/j.chemosphere.2018.10.106 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 54.25 Parallele Datenverarbeitung VZ AR 215 2019 758-765 8 |
| spelling |
10.1016/j.chemosphere.2018.10.106 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001272.pica (DE-627)ELV04461778X (ELSEVIER)S0045-6535(18)31967-2 DE-627 ger DE-627 rakwb eng 004 620 VZ 54.25 bkl Pestana, Inacio A. verfasserin aut Methylmercury in environmental compartments of a hydroelectric reservoir in the Western Amazon, Brazil 2019transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. Sediment profile Elsevier Mercury methylation Elsevier Amazon hydroelectric reservoir Elsevier Suspended particulate matter Elsevier Aquatic macrophytes Elsevier Bastos, Wanderley R. oth Almeida, Marcelo G. oth Mussy, Marilia H. oth Souza, Cristina MM. oth Enthalten in Elsevier Science Shterenlikht, Anton ELSEVIER MPI vs Fortran coarrays beyond 100k cores: 3D cellular automata 2019 chemistry, biology and toxicology as related to environmental problems Amsterdam [u.a.] (DE-627)ELV002112701 volume:215 year:2019 pages:758-765 extent:8 https://doi.org/10.1016/j.chemosphere.2018.10.106 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 54.25 Parallele Datenverarbeitung VZ AR 215 2019 758-765 8 |
| allfields_unstemmed |
10.1016/j.chemosphere.2018.10.106 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001272.pica (DE-627)ELV04461778X (ELSEVIER)S0045-6535(18)31967-2 DE-627 ger DE-627 rakwb eng 004 620 VZ 54.25 bkl Pestana, Inacio A. verfasserin aut Methylmercury in environmental compartments of a hydroelectric reservoir in the Western Amazon, Brazil 2019transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. Sediment profile Elsevier Mercury methylation Elsevier Amazon hydroelectric reservoir Elsevier Suspended particulate matter Elsevier Aquatic macrophytes Elsevier Bastos, Wanderley R. oth Almeida, Marcelo G. oth Mussy, Marilia H. oth Souza, Cristina MM. oth Enthalten in Elsevier Science Shterenlikht, Anton ELSEVIER MPI vs Fortran coarrays beyond 100k cores: 3D cellular automata 2019 chemistry, biology and toxicology as related to environmental problems Amsterdam [u.a.] (DE-627)ELV002112701 volume:215 year:2019 pages:758-765 extent:8 https://doi.org/10.1016/j.chemosphere.2018.10.106 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 54.25 Parallele Datenverarbeitung VZ AR 215 2019 758-765 8 |
| allfieldsGer |
10.1016/j.chemosphere.2018.10.106 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001272.pica (DE-627)ELV04461778X (ELSEVIER)S0045-6535(18)31967-2 DE-627 ger DE-627 rakwb eng 004 620 VZ 54.25 bkl Pestana, Inacio A. verfasserin aut Methylmercury in environmental compartments of a hydroelectric reservoir in the Western Amazon, Brazil 2019transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. Sediment profile Elsevier Mercury methylation Elsevier Amazon hydroelectric reservoir Elsevier Suspended particulate matter Elsevier Aquatic macrophytes Elsevier Bastos, Wanderley R. oth Almeida, Marcelo G. oth Mussy, Marilia H. oth Souza, Cristina MM. oth Enthalten in Elsevier Science Shterenlikht, Anton ELSEVIER MPI vs Fortran coarrays beyond 100k cores: 3D cellular automata 2019 chemistry, biology and toxicology as related to environmental problems Amsterdam [u.a.] (DE-627)ELV002112701 volume:215 year:2019 pages:758-765 extent:8 https://doi.org/10.1016/j.chemosphere.2018.10.106 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 54.25 Parallele Datenverarbeitung VZ AR 215 2019 758-765 8 |
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10.1016/j.chemosphere.2018.10.106 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001272.pica (DE-627)ELV04461778X (ELSEVIER)S0045-6535(18)31967-2 DE-627 ger DE-627 rakwb eng 004 620 VZ 54.25 bkl Pestana, Inacio A. verfasserin aut Methylmercury in environmental compartments of a hydroelectric reservoir in the Western Amazon, Brazil 2019transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. Sediment profile Elsevier Mercury methylation Elsevier Amazon hydroelectric reservoir Elsevier Suspended particulate matter Elsevier Aquatic macrophytes Elsevier Bastos, Wanderley R. oth Almeida, Marcelo G. oth Mussy, Marilia H. oth Souza, Cristina MM. oth Enthalten in Elsevier Science Shterenlikht, Anton ELSEVIER MPI vs Fortran coarrays beyond 100k cores: 3D cellular automata 2019 chemistry, biology and toxicology as related to environmental problems Amsterdam [u.a.] (DE-627)ELV002112701 volume:215 year:2019 pages:758-765 extent:8 https://doi.org/10.1016/j.chemosphere.2018.10.106 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 54.25 Parallele Datenverarbeitung VZ AR 215 2019 758-765 8 |
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Methylmercury in environmental compartments of a hydroelectric reservoir in the Western Amazon, Brazil |
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Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. |
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Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. |
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Damming rivers to generate electricity creates a lentic environment that favors methylmercury (MeHg) formation. Reservoirs in the Amazon are critical environments for MeHg formation, considering its old soils and the use of Hg in gold mining in the region. The objective of this study was to evaluate MeHg accumulation in three environmental compartments (aquatic macrophytes, suspended particulate matter (SPM) and sediment) of the Samuel reservoir (Western Amazon, Brazil), during the low water, ebb and high water hydrological periods, characterizing the dry season, the end of the rainy season and the rainy season, respectively. MeHg concentrations were determined through GC-AFS. The aquatic macrophytes presented higher %MeHg in their roots (up to 12%) compared to their other tissues. This ratio was 1.7 and 5.9 times higher than those observed for SPM and the sediment, but MeHg concentrations were the lowest (0.5–4.5 ng g−1) among the three environmental compartments. Contrary, the highest MeHg concentration was observed in SPM (104 ng g−1) during the low water period. The MeHg concentration in the sediment profile decreased with increasing depth (0.93–0.48 ng g−1) and with decreasing organic matter lability (increasing C:N ratio). In the SPM, on the other hand, MeHg concentration showed a positive association with increasing C:N ratio. We conclude that MeHg dynamics in the SPM are associated with the hydrological periods, with peaks during the low water period. The organic matter lability of the sediments is more limiting to the production of MeHg than the total Hg concentrations. |
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