Mercury dilution by autochthonous organic matter in a fertilized mangrove wetland

被引：43

作者：

Machado, Wilson ^{[1
]}

Sanders, Christian J. ^{[2
]}

Santos, Isaac R. ^{[2
]}

Sanders, Luciana M. ^{[3
]}

Silva-Filho, Emmanoel V. ^{[1
]}

Luiz-Silva, Wanilson ^{[4
]}

机构：

[1] Univ Fed Fluminense, Inst Quim, Dept Geoquim, BR-24020150 Niteroi, RJ, Brazil

[2] So Cross Univ, Sch Environm Sci & Engn, Natl Marine Sci Ctr, POB 157, Coffs Harbour, NSW 2540, Australia

[3] So Cross Univ, Sch Environm Sci & Engn, Southern Cross Geosci, Lismore, NSW 2480, Australia

[4] Univ Estadual Campinas, Inst Geociencias, BR-13083970 Campinas, SP, Brazil

来源：

ENVIRONMENTAL POLLUTION | 2016年 / 213卷

基金：

澳大利亚研究理事会; 巴西圣保罗研究基金会;

关键词：

Mangrove wetlands; Organic matter sources; Mercury dilution effect; Contamination history; Rhizosphere processes; CUBATAO ESTUARINE SYSTEM; CLIMATE-CHANGE; METALS DISTRIBUTION; SURFACE SEDIMENTS; GUANABARA BAY; HEAVY-METALS; SALT MARSHES; CARBON; CONTAMINATION; ACCUMULATION;

D O I：

10.1016/j.envpol.2016.02.002

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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.

引用

页码：30 / 35

页数：6

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