Title :

To what extent can the biogeochemical cycling of mercury modulate the measurement of dissolved mercury in surface freshwaters by passive sampling?

Author(s) :

Bretier, M. [Auteur]
RiverLy - Fonctionnement des hydrosystèmes [RiverLy]
Dabrin, A. [Auteur]
RiverLy - Fonctionnement des hydrosystèmes [RiverLy]
Billon, Gabriel [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Mathon, B. [Auteur]
RiverLy - Fonctionnement des hydrosystèmes [RiverLy]
Miège, C. [Auteur]
RiverLy - Fonctionnement des hydrosystèmes [RiverLy]
Coquery, M. [Auteur]
Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement [INRAE]
RiverLy - Fonctionnement des hydrosystèmes [RiverLy]

Journal title :

Chemosphere

Abbreviated title :

Chemosphere

Volume number :

248

Pages :

126006

Publication date :

2020-02-01

ISSN :

1879-1298

English keyword(s) :

DGT
Speciation
Methylmercury
Dissolved gaseous mercury
Rivers
Photoreduction
Time-integration

HAL domain(s) :

Chimie/Chimie théorique et/ou physique

English abstract : [en]

Mercury (Hg) is a pollutant of global concern owing to its great toxicity even at very low concentrations. Its toxicity depends on its chemical forms evidencing the importance to study its speciation. Dissolved Hg (Hg(d)) ...
Show more >Mercury (Hg) is a pollutant of global concern owing to its great toxicity even at very low concentrations. Its toxicity depends on its chemical forms evidencing the importance to study its speciation. Dissolved Hg (Hg(d)) and methylmercury (MeHg(d)) monitoring in surface freshwaters represents a great challenge because of their very low concentrations and substantial temporal variability at different timescales. The Hg(d) temporal variability depends on the environmental conditions such as the hydrology, water temperature, redox potential (Eh), and solar photo cycle. Passive samplers represent an alternative to improve the assessment of Hg(d) and MeHg(d) concentrations in surface freshwaters by integrating their temporal variability. An original sampling strategy was designed to assess the relevance of 3-mercaptopropyl DGT (Diffusive Gradient in Thin films) to integrate in situ the temporal variations of labile Hg (Hg(DGT)) and MeHg (MeHg(DGT)) concentrations. This strategy was implemented on two rivers to study the dynamics of Hg(d), Hg(DGT), MeHg(d) and MeHg(DGT) at diurnal and annual timescales. We evidenced that Hg(DGT) and MeHg(DGT) concentrations were generally consistent with discrete sampling measurements of Hg(d) and MeHg(d) in dynamic surface freshwaters. However, Hg(DGT) concentrations were overestimated (2–16 times higher) in case of low flow or low water depth, low suspended particulate matter (SPM) concentrations and elevated daily photoperiod. The most probable hypothesis is that such conditions promoted Hg0 production, and resulted in Hg0 uptake by DGT. Thus, attention should be paid when interpreting Hg(DGT) concentrations in surface freshwaters in environmental conditions that could promote Hg0 production.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS

Collections :

• Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516

Submission date :

2024-02-28T23:01:54Z
2024-03-12T11:33:38Z