Distribution and availability of mercury and methylmercury in different waters from the Rio Madeira Basin, Amazon

dc.contributor.authorVieira, Miguel
dc.contributor.authorBernardi, José V.E.
dc.contributor.authorDórea, José G.
dc.contributor.authorRocha, Bruno C.P. [UNESP]
dc.contributor.authorRibeiro, Romulo
dc.contributor.authorZara, Luis F.
dc.contributor.institutionUniversidade de Brasília (UnB)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-12-11T16:51:49Z
dc.date.available2018-12-11T16:51:49Z
dc.date.issued2018-04-01
dc.description.abstractWaters from the Amazon Basin have distinct physicochemical characteristics that can be optically classified as “black”, “clear” and “white”. We studied the distribution of total-Hg (THg) and methyl-Hg (MeHg) in these waters and respective suspended solids, sediment, phytoplankton, zooplankton, and benthic macroinvertebrates (BM) in the Madeira River Basin. Compared with the other types of water, the more acidic “black” kind had the highest THg and MeHg concentrations. The trend (black > clear > white) occurred for the concentrations of THg and MeHg in sediments and in the biotic compartment (plankton, macroinvertebrates). Organic Hg accounted for a small percentage (0.6–0.4%) of the THg in sediments but was highest in water (17–15%). For plankton and BM, the biota sediment accumulation factor (BSAFs) of MeHg (53–125) were greater than those of THg (4.5–15); however, the BSAF trend according to water type (black > clear > white) was only significant for MeHg. Sediment THg is correlated with all forms of Hg in biotic and abiotic matrices. The results indicate that water acidity in the Amazon is an important chemical characteristic in assessing Hg contamination of sediments and bioaccumulation in the aquatic food web. The differences in the BSAFs between THg and MeHg support the use of this factor for evaluating the bioaccumulation potential of sediment-bound Hg. The results add information critical to assessing environmental and health risks related to Hg methylation and potential fish-MeHg contamination, especially in tropical aquatic environments.en
dc.description.affiliationLaboratorio of Ciências da Vida e da Terra Universidade de Brasília - (Campus Planaltina)
dc.description.affiliationDepartamento de Química-UNESP - (Campus Araraquara)
dc.description.affiliationUnespDepartamento de Química-UNESP - (Campus Araraquara)
dc.format.extent771-779
dc.identifierhttp://dx.doi.org/10.1016/j.envpol.2018.01.020
dc.identifier.citationEnvironmental Pollution, v. 235, p. 771-779.
dc.identifier.doi10.1016/j.envpol.2018.01.020
dc.identifier.file2-s2.0-85041696407.pdf
dc.identifier.issn1873-6424
dc.identifier.issn0269-7491
dc.identifier.scopus2-s2.0-85041696407
dc.identifier.urihttp://hdl.handle.net/11449/170643
dc.language.isoeng
dc.relation.ispartofEnvironmental Pollution
dc.relation.ispartofsjr1,615
dc.relation.ispartofsjr1,615
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectAmazon
dc.subjectMercury
dc.subjectMethylmercury
dc.subjectpH
dc.subjectPlankton
dc.subjectSediments
dc.subjectWater color
dc.titleDistribution and availability of mercury and methylmercury in different waters from the Rio Madeira Basin, Amazonen
dc.typeArtigo

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