POTENTIAL MOBILITY AND TOXICITY RISK OF METAL POLLUTANTS IN SOILS FROM A TROPICAL AREA AFFECTED BY INDUSTRIAL WASTES

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Ricardo Soares
Maria Carla Barreto Santos Martins
John Edemond Lewis Maddock
Wilson Machado
Luiz Carlos Bertolino
David Vilas Boas de Campos
Aline Soares Freire
Ricardo Erthal Santelli

Resumen

The potential mobility of Cd, Cr, Cu, Ni, Pb and Zn in soils severely impacted by inadequate storage of industrial wastes in Rio de Janeiro State (Brazil) was evaluated by applying the Toxicity Characteristic Leaching Procedure (TCLP). This procedure allowed the estimation of toxicity risks for Cd, Cr and Pb. In a contamination hotspot within the study area, the following order of metal concentrations was observed: Pb > Zn > Cu > Ni > Cd > Cr, with significantly higher values than observed for a control site. Decades of soil exposure to wastes implied TCLP results for Pb above 300 mg/L in this hotspot, which exceed the TCLP regulatory threshold in two orders of magnitude, while Cd (up to 0.8 mg/L) and Cr (up to 0.3 mg/L) results were below the respective TCLP thresholds. Surface soil profile analysis (0-30 cm depth) indicates that Pb vertical migration occurs in the hotspot. TCLP concentrations of Pb were up to four orders of magnitude higher than the groundwater quality threshold preconized by Brazilian regulations for this metal (0.01 mg/L), suggesting that downward dispersion of large loadings of anthropogenic Pb is a major concern.

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Biografía del autor/a

Ricardo Soares, INSITUTO ESTADUAL DO AMBIENTE (INEA)

http://lattes.cnpq.br/4883854428018924

Maria Carla Barreto Santos Martins, Fluminense Federal University (UFF) Department of Geography of Campos dos Goytacazes, Fluminense Federal University, Campos dos Goytacazes, Rio de Janeiro, CEP 28010-385, Brazil

http://lattes.cnpq.br/2814445667065624

John Edemond Lewis Maddock, Fluminense Federal University (UFF) Fluminense Federal University (UFF) Department of Geochemistry, Fluminense Federal University, Niterói, Rio de Janeiro, CEP 24020-150, Brazil

http://lattes.cnpq.br/4764917317079218

Wilson Machado, Fluminense Federal University (UFF) Fluminense Federal University (UFF) Department of Geochemistry, Fluminense Federal University, Niterói, Rio de Janeiro, CEP 24020-150, Brazil

http://lattes.cnpq.br/9250125302396616

Luiz Carlos Bertolino, Mineral Technology Center (CETEM) Mineral Technology Center (CETEM), Ilha do Fundão, Rio de Janeiro, 21941-908, Brazil

http://lattes.cnpq.br/2264731136781838

David Vilas Boas de Campos, Brazilian Agricultural Research Corporation - Soil (Embrapa - Soil) EMBRAPA Solos, Jardim Botânico, Rio de Janeiro, CEP 22460-000, Brazil

http://lattes.cnpq.br/4727714816313596

Aline Soares Freire, Federal University of Rio de Janeiro Department of Analytical Chemistry, Federal University of Rio de Janeiro, Technology Center, University City, Ilha do Fundão, Rio de Janeiro State, CEP 21941-909, Brazil

http://lattes.cnpq.br/9199303713982820

Ricardo Erthal Santelli, Federal University of Rio de Janeiro Department of Analytical Chemistry, Federal University of Rio de Janeiro, Technology Center, University City, Ilha do Fundão, Rio de Janeiro State, CEP 21941-909, Brazil

http://lattes.cnpq.br/1694260923221276

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