The role of organic matter on the adsorption of mercury in sediments from Amazon lakes, Brazil

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dc.contributor.authorBonotto, Daniel Marcos [UNESP]
dc.contributor.authorVergotti, Marcelo
dc.contributor.authorDa Silveira, Ene Glória
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUNIR-Fundação Universidade Federal de Rondônia
dc.date.accessioned2022-04-29T08:47:27Z
dc.date.available2022-04-29T08:47:27Z
dc.date.issued2006-09-13
dc.description.abstractGold has been exploited intensively in the Brazilian Amazon during the past 20 years, and the elemental mercury (Hg) used in amalgamating the gold has caused abnormal Hg concentrations in waterways. Since 1986 particular attention has been given to the Madeira River because it is the largest tributary of the Amazon River and gold mining was officially allowed on a 350-km sector of the river. In this paper, samples of sediments from nine lakes located in the Madeira River basin, Rondônia State, Brazil, were analysed for mercury and organic matter. The average Hg content ranged between 33 and 157 ppb, which is about 8-40 times higher than the average value corresponding to 4.4 ppb for rocks occurring in the area (regional background). Significant correlation was found between the Hg content and organic matter in the sediments, indicating its importance on the retention of this heavy metal.en
dc.description.affiliationInstituto de Geociéncias e Ciências Exatas UNESP-Universidade Estadual Paulista Júlia de Mesquita Filho, Av. 24-A no. 1515, CEP 13506-900 Rio Clara, Sao Paulo
dc.description.affiliationDepartamento de Geografia UNIR-Fundação Universidade Federal de Rondônia, Av. Presidente Dutra no. 2965, CEP 78900-500 Porto Velho, Rondonia
dc.description.affiliationUnespInstituto de Geociéncias e Ciências Exatas UNESP-Universidade Estadual Paulista Júlia de Mesquita Filho, Av. 24-A no. 1515, CEP 13506-900 Rio Clara, Sao Paulo
dc.format.extent355-362
dc.identifier.citationIAHS-AISH Publication, n. 306, p. 355-362, 2006.
dc.identifier.issn0144-7815
dc.identifier.scopus2-s2.0-33748416186
dc.identifier.urihttp://hdl.handle.net/11449/231797
dc.language.isoeng
dc.relation.ispartofIAHS-AISH Publication
dc.sourceScopus
dc.subjectAmazon lakes
dc.subjectMadeira River basin
dc.subjectMercury
dc.subjectOrganic matter
dc.subjectPhysical weathering
dc.subjectSediments
dc.titleThe role of organic matter on the adsorption of mercury in sediments from Amazon lakes, Brazilen
dc.typeTrabalho apresentado em evento

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Artigos - Petrologia e Metalogenia - IGCE