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Assessment of Incubation Experiments Using Isotopically Enriched Mercury Compounds in Seawater including Dissolved Gaseous Mercury
https://orcid.org/0009-0007-1234-8740
https://orcid.org/0000-0001-8388-673X
https://orcid.org/0000-0002-0056-8590
The main drivers of mercury (Hg) compound distribution in seawater are poorly understood, calling for novel spatial and seasonal observations of potential transformations. However, scientific progress is hindered by a lack of intercomparability among incubation studies and the infrequent inclusion of dissolved gaseous mercury species (DGM = elemental Hg (Hg(0)) + dimethyl Hg (DMHg)) despite their importance in the biogeochemical cycle of Hg. We perform a comprehensive quality assessment on our proposed incubation protocol at near ambient concentrations (∼10 × ambient background) including the formation of DGM on three distinct coastal seawaters and discuss intercomparability with previous experimental approaches. We establish an excellent mass balance for tracer isotopes both excluding DGM (199Hg = 99.5% and 201Hg = 100.4%, median) and including DGM (199Hg = 100.3% and 201Hg = 101.7%, median). We find a good median relative standard deviation for experimental triplicates (199Hg(II) ∼ 1.7%, MM201Hg ∼ 1.5%, 199DGM ∼ 10%, 201Hg(II) ∼ 13%, and 201DGM ∼ 22%), enabling the accurate determination of methylation, demethylation, and reduction rate constants at femtomolar concentration levels. We observed Hg(0) formation from MMHg, potentially indicating reductive demethylation. This study highlights the practicability and importance of incorporating DGM species (here, Hg(0), eventually DMHg) in future incubation studies.
Performing incubation experiments with isotopically enriched Hg compounds requires critical evaluation to determine accurate reaction rates, while inclusion of volatile compounds offers novel insights for Hg and any other multi-isotope element generating volatile species.
Assessment of Incubation Experiments Using Isotopically Enriched Mercury Compounds in Seawater including Dissolved Gaseous Mercury
https://orcid.org/0009-0007-1234-8740
https://orcid.org/0000-0001-8388-673X
https://orcid.org/0000-0002-0056-8590
The main drivers of mercury (Hg) compound distribution in seawater are poorly understood, calling for novel spatial and seasonal observations of potential transformations. However, scientific progress is hindered by a lack of intercomparability among incubation studies and the infrequent inclusion of dissolved gaseous mercury species (DGM = elemental Hg (Hg(0)) + dimethyl Hg (DMHg)) despite their importance in the biogeochemical cycle of Hg. We perform a comprehensive quality assessment on our proposed incubation protocol at near ambient concentrations (∼10 × ambient background) including the formation of DGM on three distinct coastal seawaters and discuss intercomparability with previous experimental approaches. We establish an excellent mass balance for tracer isotopes both excluding DGM (199Hg = 99.5% and 201Hg = 100.4%, median) and including DGM (199Hg = 100.3% and 201Hg = 101.7%, median). We find a good median relative standard deviation for experimental triplicates (199Hg(II) ∼ 1.7%, MM201Hg ∼ 1.5%, 199DGM ∼ 10%, 201Hg(II) ∼ 13%, and 201DGM ∼ 22%), enabling the accurate determination of methylation, demethylation, and reduction rate constants at femtomolar concentration levels. We observed Hg(0) formation from MMHg, potentially indicating reductive demethylation. This study highlights the practicability and importance of incorporating DGM species (here, Hg(0), eventually DMHg) in future incubation studies.
Performing incubation experiments with isotopically enriched Hg compounds requires critical evaluation to determine accurate reaction rates, while inclusion of volatile compounds offers novel insights for Hg and any other multi-isotope element generating volatile species.
Assessment of Incubation Experiments Using Isotopically Enriched Mercury Compounds in Seawater including Dissolved Gaseous Mercury
https://orcid.org/0009-0007-1234-8740
https://orcid.org/0000-0001-8388-673X
https://orcid.org/0000-0002-0056-8590
The main drivers of mercury (Hg) compound distribution in seawater are poorly understood, calling for novel spatial and seasonal observations of potential transformations. However, scientific progress is hindered by a lack of intercomparability among incubation studies and the infrequent inclusion of dissolved gaseous mercury species (DGM = elemental Hg (Hg(0)) + dimethyl Hg (DMHg)) despite their importance in the biogeochemical cycle of Hg. We perform a comprehensive quality assessment on our proposed incubation protocol at near ambient concentrations (∼10 × ambient background) including the formation of DGM on three distinct coastal seawaters and discuss intercomparability with previous experimental approaches. We establish an excellent mass balance for tracer isotopes both excluding DGM (199Hg = 99.5% and 201Hg = 100.4%, median) and including DGM (199Hg = 100.3% and 201Hg = 101.7%, median). We find a good median relative standard deviation for experimental triplicates (199Hg(II) ∼ 1.7%, MM201Hg ∼ 1.5%, 199DGM ∼ 10%, 201Hg(II) ∼ 13%, and 201DGM ∼ 22%), enabling the accurate determination of methylation, demethylation, and reduction rate constants at femtomolar concentration levels. We observed Hg(0) formation from MMHg, potentially indicating reductive demethylation. This study highlights the practicability and importance of incorporating DGM species (here, Hg(0), eventually DMHg) in future incubation studies.
Performing incubation experiments with isotopically enriched Hg compounds requires critical evaluation to determine accurate reaction rates, while inclusion of volatile compounds offers novel insights for Hg and any other multi-isotope element generating volatile species.
Assessment of Incubation Experiments Using Isotopically Enriched Mercury Compounds in Seawater including Dissolved Gaseous Mercury
Kleindienst, Alina (author) / Tessier, Emmanuel (author) / Duval, Bastien (author) / Koenig, Alkuin (author) / Guyoneaud, Rémy (author) / Amouroux, David (author)
ACS ES&T Water ; 5 ; 50-59
2025-01-10
Article (Journal)
Electronic Resource
English
Investigations on mercury transformations in seawater using isotopically enriched species
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