Extração seletiva de metais pesados em sedimentos de fundo do Rio Tietê, São Paulo

Bevilacqua, José Eduardo; Silva, Ivone Silveira da; Lichtig, Jaim; Masini, Jorge C.

doi:10.1590/s0100-40422009000100005

Cited by 26 publications

(27 citation statements)

References 18 publications

(32 reference statements)

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“…After station 7 (Barra Bonita), the increase of Cu, Cr and Ni concentrations coincides with the anthropogenic influences from agriculture to urban areas. Bevilacqua et al (2009) at the middle part of the Tietê River basin observed a similar pattern. The case of Cu seems to be more serious, as it is used to control algae in hydroelectric reservoirs.…”

Section: Heavy Metal Content and Downstream Distribution Patternssupporting

confidence: 63%

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: Heavy Metal Content and Downstream Distribution Patternssupporting

confidence: 63%

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

2012

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“…To evaluate the potentially mobile metals, cold acid extraction procedures were used, in order to simulate the natural mobilization processes of these more "labile" elements of the sediments (Bevilacqua et al 2009). The extraction procedure with 0.5mol/L diluted hydrochloric acid (HCl) was applied (Sutherland and Tack 2008, Bevilacqua et al 2009, Li et al 2009). The procedure is based on the extraction of 0.5 g of sample with 10 mL of a solution of 0.5 mol/L HCl under continuous stirring at 200 rpm for 1 h at 20°C.…”

Section: Methodsmentioning

confidence: 99%

Potentially mobile of heavy metals on the surface sediments in tropical hyper-saline and positive estuaries

Silva

Fonseca

Grotto

et al. 2017

An. Acad. Bras. Ciênc.

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Estuarine sediments represent important pools of trace metals, released from both anthropogenic and natural sources. Fluctuations in the water column physicochemical conditions, on the other hand, may transfer metals from solid to liquid compartment and resulting in contamination of the surrounding environment. The present research was carried out to evaluate the weakly bounded heavy metal levels in tropical hypersaline and positive estuaries, in order to quantify its potentially availability. The monitoring includes five metals (Cd, Cr, Cu, Pb, Zn) and cover nine estuaries in Rio Grande do Norte state/Brazil, including four hypersaline and five true estuaries. 50 surface sediment samples were collected in each estuary. At the same time, organic matter concentrations were evaluated in order to help explaining possible local variations in heavy metal levels. Organic matter results (0.7% -7.3%) suggest the positive Potengi estuary as the most critical environmental quality situation. On the other hand, according to heavy metals levels, both Conchas and Potengi estuaries registered the higher concentrations of Cr. The highest concentrations were observed in the hyper-saline estuaries, with the exception of the Zn. The present study revealed that the watershed occupation has significantly influenced the heavy metal concentrations in the estuaries.

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“…As extrações foram baseadas nos trabalhos de Usero e colaboradores 25 e Bevilacqua e colaboradores. 26 Foi utilizado aproximadamente 1 g de sedimento, transferido para o tubo tipo Falcon (capacidade de 15 mL) e adicionado 10 mL de solução de extração (solução tampão de ácido acético/acetato de sódio a 0,1 mol L -1 ; pH 5,0). As amostras foram colocadas no agitador rotatório de frascos (agitação vertical, 30 ± 2 rotações por minuto), pelo período de 4 horas.…”

Section: Avaliação Da Biodisponibilidade De Nutrientes Metais Alcaliunclassified

Evaluation of Geochemical Biomarkers and Salinity in Sediment Core in the Lagoa do Ribeirão in Paulo Lopes, SC

Rau¹,

Bataglion²,

Madureira³

2013

Revista Virtual De Química

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Evidences obtained of increased salinity, silt+clay particle size fraction, total sulfur, dinosterol and smaller amounts of geochemical biomarkers of terrestrial sources indicate the predominance of marine environment, when the relative sea level was higher than the current level. There was a period of transition from marine to freshwater environment, characterized by the reduction of organic carbon and an increment in the amount of sand and biomarkers of terrestrial sources. After this period, the freshwater began to predominate in this lagoon, with higher amount of geochemical biomarkers of terrestrial origin such as linear alkanes n-C 27 , n-C 29 , n-C 31 , friedelin, taraxerol, β-sitosterol and campesterol and the reduction in salinity. The highest concentrations of biomarkers are located mainly in the east, southeast, south and southwest of the lagoon. These areas are close to the hills of Serra do Tabuleiro, the river Paulo Lopes entrance and exit of the river of Lagoa do Ribeirão.Keywords: Geochemical biomarkers; salinity; sediment core; Lagoa do Ribeirão. ResumoOs biomarcadores geoquímicos são compostos presentes na geosfera e estão relacionados com os precursores biológicos específicos, permitindo obter informações sobre as mudanças ambientais que ocorreram ou ainda ocorrem nos ecossistemas aquáticos e suas vizinhanças. A Lagoa do Ribeirão, localizada no município de Paulo Lopes, SC, é o sistema aquático avaliado neste trabalho através de biomarcadores geoquímicos e salinidade, principalmente. Os dados obtidos indicam a predominância de ambiente marinho, quando o nível relativo do mar estava mais elevado que o nível atual, sendo observados os aumentos da salinidade, da fração granulométrica silte+argila, da quantidade de enxofre total, dinosterol e das menores quantidades de biomarcadores geoquímicos de fontes terrestres. Houve um período de transição do ambiente marinho para o ambiente de água doce, caracterizado pela diminuição de carbono orgânico total e aumento da quantidade de areia e de biomarcadores de fontes terrestres. Após este período, a água doce começou a predominar nesta lagoa, caracterizada pelo aumento da quantidade de biomarcadores geoquímicos de origem terrestre como alcanos lineares n-C 27 , n-C 29 , n-C 31 , f iedeli a, ta axe ol, β-sitosterol e campesterol e pela diminuição da salinidade. Os biomarcadores com maiores concentrações estão situados principalmente nas regiões leste, sudeste, sul e sudoeste da lagoa, sendo estas próximas aos morros da Serra do Tabuleiro, entrada do rio Paulo Lopes e a saída do rio da Lagoa.

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Extração seletiva de metais pesados em sedimentos de fundo do Rio Tietê, São Paulo

Cited by 26 publications

References 18 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)

Potentially mobile of heavy metals on the surface sediments in tropical hyper-saline and positive estuaries

Evaluation of Geochemical Biomarkers and Salinity in Sediment Core in the Lagoa do Ribeirão in Paulo Lopes, SC

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