An isotopic record of mercury in San Francisco Bay sediment

Enduring legacy of a toxic fan via episodic redistribution of California gold mining debris

“…1B). They are also consistent with Hg isotope ratios in shallow SFBD sediments, which suggest a persistent upstream (Sierran) Hg source (16,32).…”

Historical (1850–2010) mercury stable isotope inventory from anthropogenic sources to the atmosphere

“…Further experimental and observational work on Hg isotope MDF during coal combustion, metal refining and liquid Hg 0 use is needed to confirm the presented conceptual models. High-precision Hg isotope measurement of total gaseous Hg (TGM, GEM+GOM) and precipitation Hg has been reported for several N-American and European regions (Chen et al, 2012;Demers et al, 2013Demers et al, , 2015Donovan et al, 2013;Fu et al, 2014;Gratz et al, 2010;Sherman et al, 2010Sherman et al, , 2012Sherman et al, , 2015Wang et al, 2015). Global TGM is enriched in the heavy isotopes (d 202 Hg=0.51 ± 0.41 ‰, 1SD) (Demers et al, 2013(Demers et al, , 2015Fu et al, 2014;Gratz et al, 2010;Sherman et al, 2010) compared to our model estimated GEM emissions (Table 1).…”

Methylmercury degradation and exposure pathways in streams and wetlands impacted by historical mining

“…23,30 The Hg isotopic composition of sediment has previously been used to identify anthropogenic Hg sources and trace their transport and deposition in river and estuarine environments. [31][32][33][34][35] Hg isotopes have also been measured in a variety of Hg mine waste materials, including calcines and CA Coast Range Hg-ores. [36][37][38][39][40] Hg mine wastes can vary widely in isotopic composition over very small spatial scales (e.g., δ 202 Hg range of >5‰ within a single calcine sample), 31,32 but sediment downstream of individual mines is thought to largely integrate these different mining sources.…”