Distribuição de mercúrio em diferentes solos da Bacia do médio Rio Negro-AM: influência da matéria orgânica no ciclo biogeoquímico do mercúrio

Oliveira, Luciana Camargo de; Serudo, Ricardo Lima; Botero, Wander Gustavo; Mendonça, André Gustavo Ribeiro; Santos, Ademir dos; Rocha, Júlio César; Neto, Fernando da Silva Carvalho

doi:10.1590/s0100-40422007000200006

Cited by 21 publications

(16 citation statements)

References 20 publications

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“…Soils play an important role in the biological cycle of mercury acting both as a sink and a source of this metal to biota, atmosphere and hydrological compartments (Oliveira et al, 2007). However, the speciation and the way the different species interact with the soil matrix cause changes in solubility, toxicity and bioavailability of the metal (Biester et al, 2002).…”

mentioning

confidence: 99%

Extractability and mobility of mercury from agricultural soils surrounding industrial and mining contaminated areas

et al. 2010

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This version is available at https://strathprints.strath.ac.uk/27622/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge. AbstractThis study focussed on a comparison of the extractability of mercury in soils with two different contamination sources (a chlor-alkali plant and mining activities) and on the evaluation of the influence of specific soil properties on the behaviour of the contaminant.The method applied here did not target the identification of individual species, but instead provided information concerning the mobility of mercury species in soil. Mercury fractions were classified as mobile, semi-mobile and non-mobile.The fractionation study revealed that in all samples mercury was mainly present in the semi-mobile phase (between 63 and 97%). The highest mercury mobility (2.7 mg kg -1 ) was found in soils from the industrial area. Mining soils exhibited higher percentage of non-mobile mercury, up to 35%, due to their elevated sulfur content.Results of factor analysis indicate that the presence of mercury in the mobile phase could be related to manganese and aluminum soil contents. A positive relation between mercury in the semi-mobile fraction and the aluminium content was also observed. By contrary, organic matter and sulfur contents contributed to mercury retention in the soil matrix reducing the mobility of the metal.

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Extractability and mobility of mercury from agricultural soils surrounding industrial and mining contaminated areas

et al. 2010

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“…43 The chemical and physical processes that probably control Hg emission from soil also play an important role in the distribution of different Hg species among different soil phases, which is largely associated with sorption and desorption of Hg 0 and Hg 2+ and redox reactions in soils induced by sunlight 43 and mediated by humic substances. 44,45 As mentioned, atmospheric mercury input to soil covered by forest can be expected to be significantly higher than in deforested areas, while Hg emissions are significantly enhanced in deforested areas. Soil coverage is also a determinant parameter in controlling Hg transfer from soil to aquatic systems because both leaching and soil erosion increase in deforested areas.…”

Section: Soil and Soil Cover Roles In The Mercury Cyclementioning

confidence: 97%

Major aspects of the mercury cycle in the Negro River Basin, Amazon

Silva¹,

Bisinoti²,

Fadini³

et al. 2009

J. Braz. Chem. Soc.

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Embora com pouca atividade humana, as concentrações de Hg na bacia do Rio Negro são relativamente altas. A presença natural de Hg em solos e a deposição atmosférica são as principais fontes deste metal. O balanço entre fluxos invasivos e evasivos sugerem o seu acúmulo no interior da bacia em 39.9 t ano -1. O tipo de solo, fonte de metal para os rios, e o ciclo hidrológico com períodos de cheia e seca atuam sobre a química redox das águas. A conjunção sazonal de fatores como a natureza da matéria orgânica, pH ácido e radiação solar permitem que as águas pretas oscilem de redutora a oxidante, onde, por sua vez, ocorre o consumo de Hg 0 e degradação do metilmercúrio. Deste modo, o fluxo do mercúrio pode ser invasivo ou evasivo. Embora a metilação seja mais favorecida em águas pretas, a fotodegradação do metilmercúrio se contrapõe ao seu acúmulo, contribuindo para regular o estoque deste composto na coluna água.Despite the low level of industrial activity and human density, Hg concentration in the Negro River basin is relatively high. Soil enriched with naturally high Hg concentrations and atmospheric deposition are the main sources of the metal in this watershed. Differences between invasive and evasive fluxes at the water/air and soil/air interfaces indicate Hg accumulation in the basin at a rate of 39.9 t y -1 . The type of soil, which is the main source of mercury for the water bodies, the hydrological cycle with floods and dry periods, act markedly on the water redox chemistry. A complex interaction between many seasonable variables such as solar intensity, water pH, age of the naturally occurring organic matter and the hydrological cycle alter the redox characteristics of these black water bodies, thus markedly affecting the consumption of Hg 0 and the degradation of methylmercury present in the water. Although methylation is favored in black waters, photodegradation counterpoints this formation, thus regulating the methylmercury burden in the water column.

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“…25 Em solos ácidos, vários autores têm descrito correlações entre mercúrio e matéria orgânica, nos quais a matéria orgânica, principalmente na forma de substâncias húmicas, compreende a principal classe de compostos que atua nos processos de complexação, redução e transporte de mercúrio para o ambiente. 4,26,27 A investigação do comportamento do mercúrio com as diferentes partículas presentes nos solos é de extrema importância para compreender e verificar se o mercúrio poderá ser lixiviado para os sistemas aquáticos e se poderão ocorrer outros tipos de reações, como a metilação, ou se o mercúrio ficará fortemente retido nas partículas do solo. 23 O segundo grupo é formado pelos parâmetros silte e alumínio, indicando que os teores de alumínio no solo estão correlacionados principalmente à fração silte e o terceiro grupo é formado pelos parâmetros ferro e areia, indicando que nestes solos as concentrações de ferro estão principalmente ligadas na fração de areia.…”

Section: Figura 3 Porcentagens De Mercúrio Total Nas Amostras De Solunclassified

“…Na Bacia do Rio Negro -AM, região geograficamente distante de fontes emissoras antrópicas, determinaram-se concentrações relativamente altas de Hg em amostras de cabelos da população ribeirinha, em peixes predadores, bem como em amostras de solos, sedimentos e ar. [1][2][3][4][5] Fadini e Jardim 1 sugeriram que os solos dessa região são fontes pré-antrópicas de mercúrio para os sistemas aquáticos da Bacia do Rio Negro -AM, devido às elevadas concentrações em diferentes matrizes ambientais, estando a Bacia provavelmente sob a influência do ciclo global do mercúrio. A Bacia do Rio Negro é constituída por diferentes tipos de rios, sendo classificados como rios de águas brancas, rios de águas claras e rios de águas pretas.…”

Section: Introductionunclassified

Influência das características físico-químicas dos solos no ciclo hidrobiogeoquímico do mercúrio na região do Rio Aracá - AM

Oliveira¹,

Botero²,

Santos³

et al. 2011

Quím. Nova

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Distribuição de mercúrio em diferentes solos da Bacia do médio Rio Negro-AM: influência da matéria orgânica no ciclo biogeoquímico do mercúrio

Cited by 21 publications

References 20 publications

Extractability and mobility of mercury from agricultural soils surrounding industrial and mining contaminated areas

Extractability and mobility of mercury from agricultural soils surrounding industrial and mining contaminated areas

Major aspects of the mercury cycle in the Negro River Basin, Amazon

Influência das características físico-químicas dos solos no ciclo hidrobiogeoquímico do mercúrio na região do Rio Aracá - AM

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