* 汞循环,<ref>{{cite web|title=Mercury Cycling in the Environment|url=http://wi.water.usgs.gov/mercury/mercury-cycling.html|website=Wisconsin Water Science Center|publisher=United States Geological Survey|date=10 January 2013|access-date=20 November 2017|archive-date=11 April 2021|archive-url=https://web.archive.org/web/20210411155926/https://wi.water.usgs.gov/mercury/mercury-cycling.html|url-status=live}}</ref> | * 汞循环,<ref>{{cite web|title=Mercury Cycling in the Environment|url=http://wi.water.usgs.gov/mercury/mercury-cycling.html|website=Wisconsin Water Science Center|publisher=United States Geological Survey|date=10 January 2013|access-date=20 November 2017|archive-date=11 April 2021|archive-url=https://web.archive.org/web/20210411155926/https://wi.water.usgs.gov/mercury/mercury-cycling.html|url-status=live}}</ref> |