GEOSCAN, résultats de la recherche


TitreToward an Assessment of the Global Inventory of Present-Day Mercury Releases to Freshwater Environments
AuteurKocman, D; Wilson, S J; Amos, H M; Telmer, K H; Steenhuisen, F; Sunderland, E M; Mason, R P; Outridge, P; Horvat, M
SourceInternational Journal of Environmental Research and Public Health vol. 14, no. 2, 138, 2017 p. 1-16, (Accès ouvert)
Séries alt.Secteur des sciences de la Terre, Contribution externe 20160370
ÉditeurMDPI AG
Documentpublication en série
Mediapapier; en ligne; numérique
Lat/Long OENS-180.0000 180.0000 90.0000 -90.0000
Sujetscontamination des métaux lourds; mercure; géochimie du mercure; remobilisation; écosystèmes; géochimie des eaux lacustres; réseaux de circulation de l'eau; analyses de l'eau; plante; géologie de l'environnement; géochimie; Nature et environnement
Illustrationslocation maps; bar graphs; tables
Diffusé2017 02 01
Résumé(disponible en anglais seulement)
Aquatic ecosystems are an essential component of the biogeochemical cycle of mercury (Hg), as inorganic Hg can be converted to toxic methylmercury (MeHg) in these environments and reemissions of elemental Hg rival anthropogenic Hg releases on a global scale. Quantification of effluent Hg releases to aquatic systems globally has focused on discharges to the global oceans, rather than contributions to freshwater systems that affect local exposures and risks associated with MeHg. Here we produce a first-estimate of sector-specific, spatially resolved global aquatic Hg discharges to freshwater systems. We compare our release estimates to atmospheric sources that have been quantified elsewhere. By analyzing available quantitative and qualitative information, we estimate that present-day global Hg releases to freshwater environments (rivers and lakes) associated with anthropogenic activities have a lower bound of ~1000 Mg\'01a??1. Artisanal and small-scale gold mining (ASGM) represents the single largest source, followed by disposal of mercury-containing products and domestic waste water, metal production, and releases from industrial installations such as chlor-alkali plants and oil refineries. In addition to these direct anthropogenic inputs, diffuse inputs from land management activities and remobilization of Hg previously accumulated in terrestrial ecosystems are likely comparable in magnitude. Aquatic discharges of Hg are greatly understudied and further constraining associated data gaps is crucial for reducing the uncertainties in the global biogeochemical Hg budget.