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Long-Term (2002–2015) Changes in Mercury Contamination in NE Brazil Depicted by the Mangrove Oyster Crassostraea rhizophorae (Guilding, 1828)

Author:
Rios, J. H. L., Marins, R. V., Oliveira, K. F., Lacerda, L. D.
Source:
Bulletin of environmental contamination and toxicology 2016 v.97 no.4 pp. 474-479
ISSN:
0007-4861
Subject:
environmental protection, estuaries, mercury, oysters, rural areas, sediments, sewage treatment, soil, solid wastes, Brazil
Abstract:
Mercury concentrations in oysters from four estuaries in northeastern Brazil varied following source changes during the past 13 years. Concentrations were higher in urban estuaries relative to rural areas, but decreased in the 13-years interval following improvements in solid wastes disposal and sewage treatment. In rural estuaries, the one located in an environmental protection area showed no changes in Hg concentrations in the period. However, in the Jaguaribe estuary, remobilization from soils and sediments due to regional environmental changes, increased Hg concentrations in oysters to values similar to the most contaminated metropolitan sites.
Agid:
5555524