Pb-210 and composition data of near-surface sediments and interstitial waters evidencing anthropogenic inputs in Amazon River mouth, Macapa, Brazil

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorCardoso Nery, Jose Reinaldo
dc.creatorBonotto, Daniel Marcos
dc.date2014-05-20T14:17:21Z
dc.date2016-10-25T17:39:55Z
dc.date2014-05-20T14:17:21Z
dc.date2016-10-25T17:39:55Z
dc.date2011-04-01
dc.date.accessioned2017-04-05T22:24:36Z
dc.date.available2017-04-05T22:24:36Z
dc.identifierJournal of Environmental Radioactivity. Oxford: Elsevier B.V., v. 102, n. 4, p. 348-362, 2011.
dc.identifier0265-931X
dc.identifierhttp://hdl.handle.net/11449/25197
dc.identifierhttp://acervodigital.unesp.br/handle/11449/25197
dc.identifier10.1016/j.jenvrad.2011.01.008
dc.identifierWOS:000289596600006
dc.identifierhttp://dx.doi.org/10.1016/j.jenvrad.2011.01.008
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/870114
dc.descriptionActivity profiles of excess Pb-210 determined in three sediment cores from Amazon River mouth, Macapa city, Brazil, provided the evaluation of sedimentation rates, contributing to a better knowledge of the hydrological conditions in the site that is the capital of Amapa State and is drained by the waters of the huge Amazon River. Chemical data were also determined in the sediments, allowing identify signatures coupled to anthropogenic inputs held in the past in Amapa State. Significant direct relationships between LOI (loss on ignition) and organic matter were found for all sediments profiles. Silica was found to be inversely related to organic matter in the three profiles: its decrease accompanied an increase on the specific surface of the sediments. This relationship was confirmed by a great number of inverse significant correlations among silica and oxides Na2O, K2O, CaO, MgO, Al2O3, P2O5, Fe2O3 and MnO. It was possible to identify the role of organic matter on adsorption of several oxides in the core sediments profiles. Apparent sediment mass accumulation rates corresponding to values between 450 and 2510 mg cm(-2) yr(-1) were obtained, and are compatible with the results of others studies. The Pb-210 activities in one sampling point suggested the occurrence of anthropogenic inputs related to the initial period of the mining activities conducted in Serra do Navio, Amapa State, for the commercialization of Mn ores. This was reinforced by the abrupt fluctuations in chemical data obtained for the sediments and composition of the interstitial waters occurring there. The Atlantic hurricane activity also appeared to affect the sedimentation rates in the area, as two different values were recorded in each profile. (C) 2011 Elsevier Ltd. All rights reserved.
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.languageeng
dc.publisherElsevier B.V.
dc.relationJournal of Environmental Radioactivity
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectSedimentation rates
dc.subjectPhysical weathering
dc.subjectPb-210-chronological method
dc.subjectAmazon River mouth
dc.subjectAnthropogenic influences
dc.titlePb-210 and composition data of near-surface sediments and interstitial waters evidencing anthropogenic inputs in Amazon River mouth, Macapa, Brazil
dc.typeOtro


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