2002
DOI: 10.1016/s0883-2927(01)00086-5
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Heavy metal distribution in recent sediments of the Tietê-Pinheiros river system in São Paulo state, Brazil

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Cited by 89 publications
(49 citation statements)
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“…The highest concentration for Zn was obtained at Pirapora Station (421.3 mg/kg), just above the metropolitan area of São Paulo city, being charged by domestic sewage and industrial effluents. Similar values (400.0 mg/kg) were also observed by Silva et al (2002) for the Billings reservoir near this upper station. In the mouth direction, highest Cr and Cu concentrations of 388.5 and 293.9 mg/kg were be verified respectively.…”
Section: Heavy Metal Content and Downstream Distribution Patternssupporting
confidence: 85%
“…The highest concentration for Zn was obtained at Pirapora Station (421.3 mg/kg), just above the metropolitan area of São Paulo city, being charged by domestic sewage and industrial effluents. Similar values (400.0 mg/kg) were also observed by Silva et al (2002) for the Billings reservoir near this upper station. In the mouth direction, highest Cr and Cu concentrations of 388.5 and 293.9 mg/kg were be verified respectively.…”
Section: Heavy Metal Content and Downstream Distribution Patternssupporting
confidence: 85%
“…22 These results are consistent with the findings from sediments of the Tietê-Pinheiros river system in São Paulo state where the metals are associated to a large degree with reactive forms such as sulfides and carbonates, or adsorbed to amorphous oxyhydroxides of Fe and Mn. 17 The highest amount of Cu was found in the residual fractions of the sample collected from the downstream point on the Uberabinha River (42 mg kg -1 ) indicating that this metal was strongly associated with the crystalline structures of the sediments.…”
Section: Metal Speciationmentioning
confidence: 91%
“…[14][15][16] Several studies in Brazil have highlighted serious problems of sediment contamination and the high potential bioavailability of metals in reservoirs and river segments downstream from urban centers. [17][18][19][20] These results provide useful information regarding the origin, mode of occurrence, bioavailability, potential mobility and transport of elements in the natural environmental.…”
Section: Introductionmentioning
confidence: 99%
“…33 Os valores mais significativos foram encontrados para Cd, Pb e Zn; sendo 25, 13 e 6 vezes superiores ao folhelho médio, respectivamente. No caso da amostra do Reservatório de Barra Bonita, os valores de concentração total foram semelhantes aos do folhelho médio, com exceção do Cd, o que é concordante com os resultados obtidos por Silva et al 34 Os resultados obtidos para a extração em meio de HCl 0,1 mol L -1 e os respectivos potenciais biodisponíveis mostraram que quando os sedimentos do Reservatório de Pirapora são submetidos a condições de oxidação (representadas pela secagem da amostra) ocorre uma considerável liberação (labilidade) destes metais para a solução, especialmente Ni (81,2%), Mn (81,4%), Cu (72,5%) e Cd (54,0%). A amostra de sedimento do Reservatório de Barra Bonita apresentou um comportamento bastante diferenciado em relação à Pirapora, sendo que houve uma maior liberação de Mn (100,0%), Cu (44,0%) e Zn (42,8%).…”
Section: Extração De Metais Com Hcl 01 Mol L -1 E Abertura Totalunclassified