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TitleToward an Assessment of the Global Inventory of Present-Day Mercury Releases to Freshwater Environments
AuthorKocman, 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,
Alt SeriesEarth Sciences Sector, Contribution Series 20160370
PublisherMDPI (Basel, Switzerland)
Mediapaper; on-line; digital
File formatpdf
Lat/Long WENS-180.0000 180.0000 90.0000 -90.0000
Subjectsenvironmental geology; geochemistry; heavy metals contamination; mercury; mercury geochemistry; remobilization; ecosystems; lake water geochemistry; water circulation patterns; water analyses; methylmercury; anthropogenic mercury; environmnetal mercury; biogeochmical mercury budget
Illustrationslocation maps; bar graphs; tables
AbstractAquatic 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.