PMID: 15387068Sep 25, 2004Paper

Impact of land use and physicochemical settings on aqueous methylmercury levels in the Mobile-Alabama River System

Ambio
Jean-Claude J Bonzongo, W Berry Lyons

Abstract

Mercury (Hg) concentrations above levels that could pose health risks have been measured recently in predatory fish from many aquatic systems in the southeastern region of the United States. Based on hypotheses derived from published experimental data on the aqueous geochemistry of Hg, we investigated the effect of certain natural and human-imposed conditions on in situ levels of methylmercury (MeHg) in the Mobile-Alabama River System (MARS). Water samples were collected from different types of environments, hypothesized to have contrasting levels of MeHg in the aqueous phase, and were analyzed for total-Hg (THg) and MeHg concentrations, as well as some key geochemical parameters. The results showed the following. i) Overall, total Hg concentrations in waters of the MARS are quite uniformly distributed and vary from 0.2 to 6 ng L(-1), suggesting that besides geological sources, atmospheric deposition is certainly the main source of Hg inputs in the studied system. ii) In locations with comparable THg levels, the Hg fraction present as MeHg was consistently higher in samples collected from the Coastal Plain portion of the MARS as compared to those from other geological provinces. iii) Our in situ observations confirmed conclusio...Continue Reading

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Citations

Nov 28, 2012·Environmental Toxicology and Chemistry·Michelle Zapp SluisJames H Cowan
Jan 25, 2014·Integrated Environmental Assessment and Management·Bruce K Hope, Jeff Louch
Oct 26, 2005·The Science of the Total Environment·A K DonkorD K Adotey
Mar 1, 2017·Environmental Monitoring and Assessment·E V RamasamyMahesh Mohan
Aug 9, 2011·Environmental Monitoring and Assessment·Mahesh MohanA P Thomas

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