Distribuição de mercúrio total como indicador de poluição urbana e industrial na costa brasileira

Marins, Rozane Valente; Filho, Francisco José de Paula; Maia, Saulo Robério Rodrigues; Lacerda, Luiz Drude de; Marques, Wanessa Sousa

doi:10.1590/s0100-40422004000500016

Cited by 79 publications

(73 citation statements)

References 19 publications

(25 reference statements)

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“…Use of regional or local background levels has been often discussed in literature involving heavy metal concentrations in soils, rocks and sediment profiles (Ferrand et al, 1999;Robaina et al, 2002;Marins et al, 2004;Rodrigues and Nalini, 2009). …”

Section: Regional Background Levelsmentioning

confidence: 99%

Heavy metal distribution in recent sediments along the Tiet^|^ecirc; River basin (S^|^atilde;o Pauro, Brazil)

2012

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Variations in the aquatic environmental conditions can produce a release of heavy metals from the sediment to the water resulting in an increase of their bioavailability and consequent toxicity (Young et al., 1987;Wen and Allen, 1999). This aspect can be further investigated when the samples are analyzed in recent sediments, allowing a detailed study of heavy metals in association with the bioavailable and residual fractions, involving materials of different origins. The distribution and quantification of heavy metals in river sediments are usually based on concentrations obtained from extraction procedures and compared with the natural background levels (Salomons and Förstner, 1984).The Tietê River, with 900 km of extension, is the longest river of the southeast part of Brazil. Its drainage basin, with a population of nearly 25 million people, is important for food and energy production, with more than ten hydroelectric power plants along the main channel of the river and tributaries. Over the years, with the increased population and consequent development of industry and agriculture, the river water and sediment quality deteriorated. In recent years, attention has been focused to the problem of river pollution related to the presence of heavy metals in dissolved and particulate loads (Mortatti and Probst, 2010).This paper aims to characterize the heavy metal distribution in the recent sediments along the Tietê River (from headwater to the mouth) and evaluate the degree of pollution in the river basin, considering a regional background level. (Received March 31, 2011; Accepted September 22, 2011) The distribution of heavy metals in recent sediments deposited along the Tietê River, a highly polluted river in southeast region of Brazil was studied. Around the metropolitan area of São Paulo city (25 million people), the pollution is related to municipal wastes and industrial effluents with reinforced downstream by agricultural activities. The observed increase of heavy metal concentrations is particularly important for Zn in the upper basin and Cu, Co and Cr at mouth. Geo-accumulation index calculation, related to the regional background, showed that the sediments along the basin are seriously polluted by heavy metals of anthropogenic origin, mainly Cu, Co, Cr and Zn. Calculated index suggests medium to very strongly pollution. Heavy metal distribution in recent sedimentsKeywords: heavy metals, Tietê River, sediments, geo-accumulation index, pollution INTRODUCTIONHeavy metals are considered one of the greatest threats to the human health, due to their toxic effects on the environment. They are present in various compartments (atmosphere, water, soil, sediments and living organisms) and their forms are controlled by physical and chemical conditions as well as by biological processes. Natural occurrence of heavy metals is related to distribution of clastic mineral detritus from soil, rock and volcanic eruptions (Sanei et al., 2001;Mortatti and Probst, 2010), and from anthropogenic activities related to agricultu...

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Section: Regional Background Levelsmentioning

confidence: 99%

Heavy metal distribution in recent sediments along the Tiet^|^ecirc; River basin (S^|^atilde;o Pauro, Brazil)

2012

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“…Este método tem sido bastante aplicado 23,24 até mesmo para estimativa de valores de "background" para escalas regionais 25 . As anomalias geoquímicas nos sedimentos de superfície foram avaliadas por meio de coeficientes de variação, freqüências cumulativas relativas e fatores de enriquecimento.…”

Section: Tratamento Dos Dadosunclassified

“…Estes fatores podem ser significativamente influenciados por variações sazonais na temperatura e na pluviosidade 13,41 . Não obstante, as oscilações temporais no aporte antrópico de elementos-traço também podem contribuir para a variabilidade sazonal das concentrações destes contaminantes nos sedimentos costeiros, como no caso da área de influência da região metropolitana de Fortaleza, no Ceará 25 . Considerando todo o conjunto de drenagens investigado (dados não mostrados), alguns dos contaminantes tenderam a seguir a mesma variabilidade sazonal observada no rio Morrão (e.g.…”

Section: Variabilidade Sazonalunclassified

Variabilidade espacial e sazonal da concentração de elementos-traço em sedimentos do sistema estuarino de Santos-Cubatão (SP)

Luiz-Silva¹,

Matos²,

Kristosch³

et al. 2006

Quím. Nova

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Recebido em 22/3/05; aceito em 28/6/05; publicado na web em 20/1/06 SPATIAL AND SEASONAL VARIABILITY OF TRACE-ELEMENT CONCENTRATIONS IN SEDIMENTS FROM THE SANTOS-CUBATÃO ESTUARINE SYSTEM, SÃO PAULO, BRAZIL. Multi-element analyses of sediment samples from the Santos-Cubatão Estuarine System were carried out to investigate the spatial and seasonal variability of trace-element concentrations. The study area contains a rich mangrove ecosystem that is a habitat for tens of thousands of resident and migratory birds, some of them endangered globally. Enrichments of metals in fine-grained surface sediments are, in decreasing order, Hg, Mn, La, Ca, Sr, Cd, Zn, Pb, Ba, Cu, Cr, Fe, Nb, Y, Ni and Ga, relative to pre-industrial background levels. The maximum enrichment ranged from 49 (Hg) to 3.1 (Ga). Mercury concentrations were greater in the Cubatão river than in other sites, while the other elements showed greater concentrations in the Morrão river. Concentrations of Mn were significantly greater in winter and autumn than in summer and spring. However, other elements (e.g. Cd and Pb) showed the opposite, with greater concentrations in summer and spring. This study suggests that seasonal changes in physical and chemical conditions may affect the degree of sediment enrichment and therefore make the assessment of contamination difficult. Consequently, these processes need to be considered when assessing water quality and the potential contamination of biota.

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“…Domínios como nanociência e nanotecnologia [11][12][13] , fármacos [14][15][16][17][18] , ambiente [19][20][21][22][23][24][25][26] …”

Section: Publicações Científicasunclassified

Química no Brasil: perspectivas e necessidades para a próxima década - Documento básico

Andrade¹,

Pinto²,

Cadore³

et al. 2005

Quím. Nova

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Distribuição de mercúrio total como indicador de poluição urbana e industrial na costa brasileira

Cited by 79 publications

References 19 publications

Heavy metal distribution in recent sediments along the Tiet^|^ecirc; River basin (S^|^atilde;o Pauro, Brazil)

Heavy metal distribution in recent sediments along the Tiet^|^ecirc; River basin (S^|^atilde;o Pauro, Brazil)

Variabilidade espacial e sazonal da concentração de elementos-traço em sedimentos do sistema estuarino de Santos-Cubatão (SP)

Química no Brasil: perspectivas e necessidades para a próxima década - Documento básico

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