Toward an Assessment of the Global Inventory of Present-Day Mercury Releases to Freshwater Environments
Open Access
- 31 January 2017
- journal article
- research article
- Published by MDPI AG in International Journal of Environmental Research and Public Health
- Vol. 14 (2), 138
- https://doi.org/10.3390/ijerph14020138
Abstract
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· a−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.Keywords
Funding Information
- Slovenian Research Agency (P1-0143, L2-6778)
- European Commission (GMOS 265113)
This publication has 62 references indexed in Scilit:
- Legacy impacts of all‐time anthropogenic emissions on the global mercury cycleGlobal Biogeochemical Cycles, 2013
- Mercury as a Global Pollutant: Sources, Pathways, and EffectsEnvironmental Science & Technology, 2013
- All-Time Releases of Mercury to the Atmosphere from Human ActivitiesEnvironmental Science & Technology, 2011
- Global atmospheric model for mercury including oxidation by bromine atomsAtmospheric Chemistry and Physics, 2010
- Global mercury emissions to the atmosphere from anthropogenic and natural sourcesAtmospheric Chemistry and Physics, 2010
- Soil quality degradation processes along a deforestation chronosequence in the Ziwuling area, ChinaCATENA, 2008
- Factors Affecting Methylmercury Levels in Surficial Tailings from Historical Nova Scotia Gold MinesGeomicrobiology Journal, 2008
- Human impacts on open ocean mercury concentrationsGlobal Biogeochemical Cycles, 2007
- Chlor-alkali industrial contamination and riverine transport of mercury: Distribution and partitioning of mercury between water, suspended matter, and bottom sediment of the Thur River, FranceApplied Geochemistry, 2006
- Modeling erosion and overbank deposition during extreme flood conditions on the Carson River, NevadaJournal of Hydrology, 2004