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Type: Artigo
Title: Mercury Dilution By Autochthonous Organic Matter In A Fertilized Mangrove Wetland
Author: Machado
Wilson; Sanders
Christian J.; Santos
Isaac R.; Sanders
Luciana M.; Silva-Filho
Emmanoel V.; Luiz-Silva
Abstract: A dated sediment core from a highly-fertilized mangrove wetland located in Cubatao (SE Brazil) presented a negative correlation between mercury (Hg) and organic carbon contents. This is an unusual result for a metal with well-known affinity to organic matter. A dilution of Hg concentrations by autochthonous organic matter explained this observation, as revealed by carbon stable isotopes signatures (delta C-13). Mercury dilution by the predominant mangrove-derived organic matter counterbalanced the positive influences of algal-derived organic matter and clay contents on Hg levels, suggesting that deleterious effects of Hg may be attenuated. Considering the current paradigm on the positive effect of organic matter on Hg concentrations in coastal sediments and the expected increase in mangrove organic matter burial due to natural and anthropogenic stimulations of primary production, predictions on the influences of organic matter on Hg accumulation in mangrove wetlands deserve caution. (C) 2016 Elsevier Ltd. All rights reserved.
Subject: Mangrove Wetlands
Organic Matter Sources
Mercury Dilution Effect
Contamination History
Rhizosphere Processes
Editor: Elsevier Sci LTD
Citation: Environmental Pollution. Elsevier Sci Ltd, v. 213, p. 30 - 35, 2016.
Rights: fechado
Identifier DOI: 10.1016/j.envpol.2016.02.002
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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