How mercury gets into the sea (University of Basel; 29 September 2021)
https://www.unibas.ch/en/News-Events/News/Uni-Research/How-mercury-gets-into-the-sea.html

Also…
Rivers Are Largest Global Source of Mercury in Coastal Oceans (Geoffrey GILLER, School of the Environment – Yale University; August 13, 2021)
https://environment.yale.edu/news/article/rivers-are-largest-global-source-of-mercury-in-oceans
Selected Research Publications:
Mercury export from Arctic great rivers (ZOLKOS et al., 2020)
https://par.nsf.gov/servlets/purl/10188316
Mercury pollution of riverine sediments in a typical irrigation area in the Beijing-Tianjin-Hebei region (MENG et al., 2020)
A Coupled Global Atmosphere-Ocean Model for Air-Sea Exchange of Mercury: Insights into Wet Deposition and Atmospheric Redox Chemistry (ZHANG et al., 2019)
http://47.110.237.248/papers/Zhang-EST-2019.pdf
Geochemical processes of mercury transformation in the river-sea system (NGUYEN, 2019)
https://iopscience.iop.org/article/10.1088/1755-1315/315/5/052039/pdf
Global biogeochemical implications of mercury discharges from rivers and sediment burial (AMOS et al., 2014)