Mangrove sediments as long-term mercury sinks: Evidence from millennial to decadal time scales.

The mercury (Hg) cycle in estuaries has been globally discussed, although Holocene deposition in mangrove sediments remains unknown. Herein, a sediment core from a mangrove system in southeastern Brazil was C-dated to evaluate millennial Hg deposition. The highest Hg concentrations (1010-2540 ng g) in surface sediments were explained by emissions from a chlor-alkali industry (1964 CE).