Mercury dispersal in water, sediments and aquatic biota of a gold mining tailing deposit drainage in pocone, Brazil

Lacerda, Luiz Drude de; Pfeiffer, Wolfgang C.; Marins, Rozane Valente; Rodrigues, Sónia; Souza, Cristina Maria Magalhães de; Bastos, Wanderley Rodrigues

doi:10.1007/bf00211194

Cited by 62 publications

(28 citation statements)

References 9 publications

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“…These data demonstrate the considerable variations in Hg concentrations in aquatic macrophytes that settle in a wide diversity of aquatic environments. This wide range of concentrations is attributed to variables such as Hg partitioning in water and sediment, water physicochemistry, and plant physiology and genotypic features (Lacerda et al, 1991;Outridge & Noller, 1991;Jackson, 1998;Maury-Brachet et al, 1990). Therefore, meaningful comparisons with literature data should at least be restricted to the tropics, notwithstanding the paucity of data from that region.…”

Section: Resultsmentioning

confidence: 99%

“…Aquatic macrophytes accumulate Hg with high concentration factors relative to the Hg concentrations present in water, thus affecting the distribution of this metal among the different compartments of aquatic systems (Lacerda et al, 1991;Dushenko et al, 1995;Villar et al, 1999). Also, macrophyte rhizospheres are important sites of Hg methylation in tropical freshwater ecosystems (Guimarães et al, 1998;2002), acting as a potential Hg source for herbivorous organisms and enhancing Hg transfer along food chains (Suarez et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Mercury contents in aquatic macrophytes from two reservoirs in the Paraíba do Sul: Guandú river system, SE Brazil

et al. 2006

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This paper reports on a study to determine the Hg content in the five most abundant aquatic macrophyte species (Elodea densa, Sagittaria montevidensis, Salvinia auriculata, Pistia stratiotes and Eichhornia crassipes) in two artificial reservoirs flooded by water diverted from the Paraíba do Sul river, SE Brazil. The potential of these species for Hg accumulation and their role in Hg transport along the river system due to macrophyte management were evaluated. Mercury concentrations were higher in free-floating than in rooted species. Roots were also richer in Hg than were leaves. Dry weight Hg concentrations in leaves and roots from all species varied from 46-246 ng.g -1 to 37-314 ng.g -1 , respectively. These values are higher than those reported for uncontaminated lakes in Brazil and in other tropical areas and similar to those reported for moderately contaminated sites. Mercury concentrations can be attributed to fluvial transport from the heavily industrialized Paraíba do Sul river basin. Intensive sampling of Pistia stratiotes from two sites in the Vigário reservoir was performed to evaluate the capacity of Hg incorporation in short periods of time. The results showed a significant negative correlation between Hg content and size class of individual plants, demonstrating the importance of juveniles, fast growing plants in absorbing Hg. The foremost impact related to Hg contents in the studied area concerns the periodic removal of macrophytes for reservoir management, followed by disposal in nearby areas. This results in the mobilization of 0.52 to 1.3 Kg of Hg per year, a significant fraction of the Hg burden present in reservoir waters. Disposal of such material may result in Hg leaching to river systems, affecting the Hg transfer throughout the basin.Keywords: mercury, aquatic macrophytes, artificial reservoirs. RESUMO

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mercury contents in aquatic macrophytes from two reservoirs in the Paraíba do Sul: Guandú river system, SE Brazil

et al. 2006

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“…Pfeiffer e colaboradores 83 avaliaram a presença de mercúrio em águas, sedimentos e peixes em regiões de garimpo, em Rondônia, e encontraram concentrações elevadas deste elemento em algumas espécies de peixes, com valores superiores em até cinco vezes aos recomendados para consumo humano. Outras publicações abordam a distribuição do Hg entre a coluna de água, o sedimento e a biota em uma área de garimpo em Poconé, 84 Poconé e Alta Floresta 85 (MT) e nos reservatórios de usinas hidrelétricas no Pará. 86 Em 1997, Lacerda publica artigo de revisão avaliando a evolução da contaminação por mercúrio no Brasil, com ênfase para as fontes industriais e garimpo do ouro.…”

Section: Hidrosferaunclassified

A Química Ambiental no Brasil nos 40 anos da SBQ

Canela¹,

Fostier²,

Grassi³

2017

Quim. Nova

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ENVIRONMENTAL CHEMISTRY IN BRAZIL IN 40 YEARS IN THE SBQ. This paper aims to present an overview of the ongoing of the Brazilian environmental chemistry over the last forty years inserted in the context of the Brazilian Chemical Society (SBQ). Initially, a brief history presents the main milestones and premise of its "birth" in the 1980s, as well as the set of major actions taken within the SBQ to consolidate and strengthen this area of research. Then, in a separated approach between atmosphere, hydrosphere and lithosphere, we present the evolution of the main topics covered in Environmental Chemistry in Brazil, as well as the contribution of the chemists in the interdisciplinary scenario that constitutes this area. Finally, an overview of the evolution of the teaching of Environmental Chemistry in Brazil is presented.Keywords: environmental chemistry, atmosphere, hydrosphere, lithosphere, HISTÓRICO DA QUÍMICA AMBIENTAL NO BRASILNo Brasil, a Química Ambiental se desenvolveu a partir de um vínculo estreito com a Química Analítica, que se consolidou com base em uma escola consolidada e tradicional, com uma visão clássica sobre seu papel e voltada, em primeira instância, para o desenvolvimento de protocolos analíticos e elucidação de problemas estabelecidos dentro do laboratório. Portanto, boa parte dos primeiros químicos ambientais tinha uma forte ligação com a Química Analítica e eram poucos aqueles com experiência em trabalhos de campo e amostragem ambiental. Nos anos 1980, a pesquisa em Química Ambiental conduzida em nosso país tinha como base o monitoramento de espécies químicas presentes na hidrosfera, atmosfera e biota.1 Existem documentos evidenciando a escassez de atividades de pesquisa dedicadas ao estudo da reatividade química e comportamento de poluentes não apenas nos três compartimentos mencionados anteriormente, mas igualmente em suas interfaces.2 Estas circunstâncias resultaram em um desenvolvimento mais lento da Química Ambiental brasileira, quando comparada com a de outros países, especialmente os desenvolvidos. Não obstante estes aspectos, nos dias atuais a Química Ambiental ocupa posição de destaque no cenário científico nacional, tendo igualmente alcançado projeção internacional. Vários eventos científicos também têm contribuído para isso, tais como as Reuniões Anuais da Sociedade Brasileira CENÁRIO DE ESTUDO DA QUÍMICA AMBIENTAL NO BRASILPara contemplar o cenário das pesquisas em Química Ambiental no Brasil, decidimos dividir os estudos em hidrosfera, atmosfera e litosfera, embora estes compartimentos sejam integrados e não haja um mais importante que o outro e tampouco podem ser vistos separadamente. Além disso, este texto não tem a pretensão de fazer uma revisão exaustiva das publicações nestas áreas dentro da Química Ambiental, mas sim de apresentar um panorama da evolução e dos temas que foram e estão sendo estudados nestes 40 anos da Sociedade Brasileira de Química, apresentando exemplos de alguns destes trabalhos. Atmosfera

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“…In the gold mines of Pocone, it is presumed that 10-15 tons of mercury was used to produce amalgam in the 1980s (Lacerda et al 1991). Some quantity of this mercury flows and evaporates into the rivers and the atmosphere increases at the start of the rainy season.…”

Section: Development Around the Wetlandmentioning

confidence: 99%

Ecotourism in the North Pantanal, Brazil: Regional Bases and Subjects for Sustainable Development

Maruyama

Nihei

Nishiwaki

2005

Geogr. Rev. JPN, Chirigaku Hyoron

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Abstract:The Brazilian Pantanal, the world's largest wetland holding abundant wildlife, has recently drawn profound concern about the development of the tourist industry. To provide significant proposals for ecotourism in the wetland, we believe that detailed data acquired by fieldwork is requisite, This study examines the regional bases that carry regional ecotourism, and attempts to present some proposals for ecotourism from the case of the north Pantanal. The results are shown as follows in order of regional scale. (1) In the water source of the Pantanal, Cerrado region, it is necessary to make efficient plans to control recent agricultural development, especially in soybean and cotton production.

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Mercury dispersal in water, sediments and aquatic biota of a gold mining tailing deposit drainage in pocone, Brazil

Cited by 62 publications

References 9 publications

Mercury contents in aquatic macrophytes from two reservoirs in the Paraíba do Sul: Guandú river system, SE Brazil

Mercury contents in aquatic macrophytes from two reservoirs in the Paraíba do Sul: Guandú river system, SE Brazil

A Química Ambiental no Brasil nos 40 anos da SBQ

Ecotourism in the North Pantanal, Brazil: Regional Bases and Subjects for Sustainable Development

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