Toward an Assessment of the Global Inventory of Present-Day Mercury Releases to Freshwater Environments
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· 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. View Full-Text
- Supplementary File 1:
PDF-Document (PDF, 468 KB)
Share & Cite This Article
Kocman, D.; Wilson, S.J.; Amos, H.M.; Telmer, K.H.; Steenhuisen, F.; Sunderland, E.M.; Mason, R.P.; Outridge, P.; Horvat, M. Toward an Assessment of the Global Inventory of Present-Day Mercury Releases to Freshwater Environments. Int. J. Environ. Res. Public Health 2017, 14, 138.
Kocman D, Wilson SJ, Amos HM, Telmer KH, Steenhuisen F, Sunderland EM, Mason RP, Outridge P, Horvat M. Toward an Assessment of the Global Inventory of Present-Day Mercury Releases to Freshwater Environments. International Journal of Environmental Research and Public Health. 2017; 14(2):138.Chicago/Turabian Style
Kocman, David; Wilson, Simon J.; Amos, Helen M.; Telmer, Kevin H.; Steenhuisen, Frits; Sunderland, Elsie M.; Mason, Robert P.; Outridge, Peter; Horvat, Milena. 2017. "Toward an Assessment of the Global Inventory of Present-Day Mercury Releases to Freshwater Environments." Int. J. Environ. Res. Public Health 14, no. 2: 138.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.