Salinity and total suspended solids control mercury speciation in a tidal river: Comparisons with a photochemical mercury model

Daytime volatilization of gaseous elemental mercury (Hg(0)aq) is a significant mechanism for mercury removal from aquatic systems and potentially limits the production and bioaccumulation of methylmercury. Changes in incoming solar radiation (in the ultraviolet range), dissolved organic matter, sali...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2023-12, Vol.344, p.140313-140313, Article 140313
Main Authors: Clarke, Rachel G., Klapstein, Sara J., Keenan, Robert, O'Driscoll, Nelson J.
Format: Article
Language:English
Subjects:
Bay of Fundy
Dissolved organic matter
Estuary
Mercury photoreduction
Salinity
Total suspended solids
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Summary:Daytime volatilization of gaseous elemental mercury (Hg(0)aq) is a significant mechanism for mercury removal from aquatic systems and potentially limits the production and bioaccumulation of methylmercury. Changes in incoming solar radiation (in the ultraviolet range), dissolved organic matter, salinity, and total suspended particles were investigated concurrently with several mercury species (Hg(0)aq, dissolved total mercury (THg), easily reducible mercury (ERM), and mercury associated with total suspended solids (THgTSS)) during daylight hours near the mouth of a hypertidal river. There were no predictable temporal changes observed for Hg(0)aq in unfiltered surface water. Hg(0)aq ranged from 0 to 12 pg L−1, THg ranged from 0 to 492 pg L−1, ERM ranged from 13 to 381 pg L−1, and THgTSS ranged from
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2023.140313