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Fate of mercury species in the coastal plume of the Adour River estuary (Bay of Biscay, SW France).

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Title: Fate of mercury species in the coastal plume of the Adour River estuary (Bay of Biscay, SW France).
Authors: Sharif, Abubaker1, Monperrus, Mathilde1, Tessier, Emmanuel1, Bouchet, Sylvain1, Pinaly, Hervé1, Rodriguez-Gonzalez, Pablo1, Maron, Philippe2, Amouroux, David1 david.amouroux@univ-pau.fr
Source: Science of the Total Environment. Oct2014, Vol. 496, p701-713. 13p.
Subjects: Biogeochemistry, Methylmercury compounds, Inorganic compounds, Demethylation, Territorial waters
Geographic Terms: Adour River (France)
Abstract: Because mercury (Hg) undergoes significant biogeochemical processes along the estuarine-coastal continuum, the objective of this work was to investigate the distribution and reactivity of methylmercury (MeHg), inorganic mercury (Hg(II)) and gaseous Hg (DGM) in plume waters of the Adour River estuary (Bay of Biscay). Vertical profiles, spatial and tidal variability of Hg species concentrations were evaluated during two campaigns (April 2007 and May 2010) characterized by significant plume extents over the coastal zone. Incubations with isotopically enriched tracers were performed on bulk and filtered waters under sunlight or dark conditions to investigate processes involved in Hg methylation, demethylation and reduction rates. Total Hg(II) concentrations were more dispersed in April 2007 (5.2 ± 4.9 pM) than in May 2010 (2.5 ± 1.1 pM) while total MeHg concentrations were similar for both seasons and averaged 0.13 ± 0.07 and 0.18 ± 0.11 pM, respectively. DGM concentrations were also similar between the two campaigns, averaging 0.26 ± 0.10 and 0.20 ± 0.09 pM, respectively. Methylation yields remained low within the estuarine plume (< 0.01–0.4% day − 1 ) while MeHg was efficiently demethylated via both biotic and abiotic pathways (2.3–55.3% day − 1 ), mainly photo-induced. Hg reduction was also effective in these waters (0.3–43.5% day − 1 ) and was occurring in both light and dark conditions. The results suggest that the plume is overall a sink for MeHg with integrated net demethylation rates, ranging from 2.0–3.7 g (Hg) d − 1 , in the same range than the estimated MeHg inputs from the estuary (respectively, 0.9 and 3.5 g (Hg) d − 1 ). The large evasion of DGM from the plume waters to the atmosphere (8.8–26.9 g (Hg) d − 1 ) may also limit Hg T inputs to coastal waters (33–69 g (Hg) d − 1 ). These processes are thus considered to be most significant in controlling the fate of Hg transferred from the river to the coastal zone. [ABSTRACT FROM AUTHOR]
Copyright of Science of the Total Environment is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 97848275
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  Data: Fate of mercury species in the coastal plume of the Adour River estuary (Bay of Biscay, SW France).
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Sharif%2C+Abubaker%22&quot;&gt;Sharif, Abubaker&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Monperrus%2C+Mathilde%22&quot;&gt;Monperrus, Mathilde&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Tessier%2C+Emmanuel%22&quot;&gt;Tessier, Emmanuel&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Bouchet%2C+Sylvain%22&quot;&gt;Bouchet, Sylvain&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Pinaly%2C+Herv&#233;%22&quot;&gt;Pinaly, Herv&#233;&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Rodriguez-Gonzalez%2C+Pablo%22&quot;&gt;Rodriguez-Gonzalez, Pablo&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Maron%2C+Philippe%22&quot;&gt;Maron, Philippe&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Amouroux%2C+David%22&quot;&gt;Amouroux, David&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;i&gt; david.amouroux@univ-pau.fr&lt;/i&gt;
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Science+of+the+Total+Environment%22&quot;&gt;Science of the Total Environment&lt;/searchLink&gt;. Oct2014, Vol. 496, p701-713. 13p.
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  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Adour+River+%28France%29%22&quot;&gt;Adour River (France)&lt;/searchLink&gt;
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  Label: Abstract
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  Data: Because mercury (Hg) undergoes significant biogeochemical processes along the estuarine-coastal continuum, the objective of this work was to investigate the distribution and reactivity of methylmercury (MeHg), inorganic mercury (Hg(II)) and gaseous Hg (DGM) in plume waters of the Adour River estuary (Bay of Biscay). Vertical profiles, spatial and tidal variability of Hg species concentrations were evaluated during two campaigns (April 2007 and May 2010) characterized by significant plume extents over the coastal zone. Incubations with isotopically enriched tracers were performed on bulk and filtered waters under sunlight or dark conditions to investigate processes involved in Hg methylation, demethylation and reduction rates. Total Hg(II) concentrations were more dispersed in April 2007 (5.2 &#177; 4.9 pM) than in May 2010 (2.5 &#177; 1.1 pM) while total MeHg concentrations were similar for both seasons and averaged 0.13 &#177; 0.07 and 0.18 &#177; 0.11 pM, respectively. DGM concentrations were also similar between the two campaigns, averaging 0.26 &#177; 0.10 and 0.20 &#177; 0.09 pM, respectively. Methylation yields remained low within the estuarine plume (&lt; 0.01–0.4% day − 1 ) while MeHg was efficiently demethylated via both biotic and abiotic pathways (2.3–55.3% day − 1 ), mainly photo-induced. Hg reduction was also effective in these waters (0.3–43.5% day − 1 ) and was occurring in both light and dark conditions. The results suggest that the plume is overall a sink for MeHg with integrated net demethylation rates, ranging from 2.0–3.7 g (Hg) d − 1 , in the same range than the estimated MeHg inputs from the estuary (respectively, 0.9 and 3.5 g (Hg) d − 1 ). The large evasion of DGM from the plume waters to the atmosphere (8.8–26.9 g (Hg) d − 1 ) may also limit Hg T inputs to coastal waters (33–69 g (Hg) d − 1 ). These processes are thus considered to be most significant in controlling the fate of Hg transferred from the river to the coastal zone. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Science of the Total Environment is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.scitotenv.2014.06.116
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 13
        StartPage: 701
    Subjects:
      – SubjectFull: Biogeochemistry
        Type: general
      – SubjectFull: Methylmercury compounds
        Type: general
      – SubjectFull: Inorganic compounds
        Type: general
      – SubjectFull: Demethylation
        Type: general
      – SubjectFull: Territorial waters
        Type: general
      – SubjectFull: Adour River (France)
        Type: general
    Titles:
      – TitleFull: Fate of mercury species in the coastal plume of the Adour River estuary (Bay of Biscay, SW France).
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            NameFull: Sharif, Abubaker
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            NameFull: Monperrus, Mathilde
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            NameFull: Tessier, Emmanuel
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              Text: Oct2014
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