Competitive sorption and desorption of heavy metals in mine soils: Influence of mine soil characteristics

Vega, F.A.; Covelo, Emma F.; Andrade, Liliana María

doi:10.1016/j.jcis.2006.01.012

Cited by 175 publications

(102 citation statements)

References 38 publications

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“…It should be noted that the hydroxides of the tested metals do not precipitate in the pH range at which experiments were conducted (Cherry, 1982). Finally, as expected, the Cd retardation factor decreased when Cd was in competition with other cations for sorption sites (Markiewiez-Patkowska et al, 2005;Serrano et al, 2005;Vega et al, 2006). Pb ions experienced a slightly higher retardation in the competitive scenario, as this metal is adsorbed specifically on sites with high dissociation constants.…”

Section: Flow Experimentssupporting

confidence: 68%

“…Preliminary studies showed that over the concentration range tested, Cr reached sorption equilibrium after 192 h, the longest equilibration time of the five metals studied (Fonseca et al, 2009a;Serrano et al, 2005;Usman, 2008;Vega et al, 2006). Therefore, all the batch equilibrium tests, including blanks, were undertaken in an orbital mixer (Certomat® S) for 192 h at room temperature (25 ± 0.5°C…”

Section: Batch Experimentsmentioning

confidence: 99%

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Mobility of Cr, Pb, Cd, Cu and Zn in a loamy sand soil: A comparative study

et al. 2011

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Interest in soil contamination has been growing in recent years due to the ongoing degradation of soil environments. Therefore, the development of remediation techniques and the study of contaminant sorption and migration are areas of intense research. In this study, the authors sought to evaluate the scenario of co-contamination of a loamy sand soil by multiple heavy metals. To that end, the sorption and transport of five metals-Cr, Pb, Cd, Cu and Zn-was evaluated using representative samples of a soil from the north of Portugal. The tests were conducted in batch and continuous systems using single-and multiple-metal acid solutions to evaluate the effect of metal competition. In accordance with the type of assay-batch or continuous-Langmuir or Convection Dispersion Two-Site Nonequilibrium models were adjusted to explain the sorption/transport data. FTIR analyses were performed on the final samples of the continuous systems. Generally, the results revealed good fitting of the tested models for the metals in competitive and noncompetitive scenarios, with the exception of Zn that was originally present in soil samples at higher concentrations. As expected, the influence of competition was observed in both batch and continuous systems, but with different tendencies. The FTIR spectra also revealed a strong influence of clay minerals and organic matter on the sorption of the metals.

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Section: Flow Experimentssupporting

confidence: 68%

Section: Batch Experimentsmentioning

confidence: 99%

Mobility of Cr, Pb, Cd, Cu and Zn in a loamy sand soil: A comparative study

et al. 2011

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“…In general, all stages of mining produce environmental impacts, resulting in the destruction of natural soils and the creation of new soils (FAO 2014). The new soils are mechanically, physically, chemically, and biologically deficient (Vega et al 2006), characterized by instability and limited cohesion, with low concentrations of nutrients and organic matter and high levels of HMs (He et al 2005). HMs are among the most widespread contaminants in the environment (Christoforou et al 2000), and can be transferred to animals and humans through various exposure pathways such as the food chain and direct contact (Alloway 2013).…”

Section: Introductionmentioning

confidence: 99%

Investigating Heavy Metal Pollution in Mining Brownfield and Its Policy Implications: A Case Study of the Bayan Obo Rare Earth Mine, Inner Mongolia, China

Pan

2016

Environmental Management

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The rapid urbanization of China and associated demand for land resources necessitates remediation, redevelopment, and reclamation of contaminated soil. Before these measures are taken, a basic investigation and inventory of heavy metal (HM) pollution levels in contaminated soil is necessary for establishing and implementing the redevelopment plan. In the present study, to identify the policy implications of inventorying and mapping HM pollution of soil in brownfields throughout China, the Bayan Obo giant rare earth element (REE)-Nb-Fe ore deposit of Baotou in Inner Mongolia, China, which is the largest REE mineral deposit in the world, was taken as a case study. Soil samples from 24 sites in Bayan Obo mining area (MA) and 76 sites in mine tailing area (TA) were collected for determining contents of soil HMs (Cr, Cd, Pb, Cu, and Zn). The results showed that the average concentrations of Cr, Cd, Pb, Cu, and Zn in both MA and TA were all higher than their corresponding background values for Inner Mongolia but lower than the Class II criteria of the National Soil Quality Standards of China (GB 15618-1995). Enrichment factor (EF) analysis of the soil samples indicated that the soil in the brownfield sites was highly enriched with Cr, Cd, Pb, Cu, and Zn compared to the corresponding background values. In MA, the EF for Cd was the highest among the studied elements, while in TA, the EF for Cr (3.45) was the highest, closely followed by the EF for Cd (3.34). The potential ecological risk index (RI) indicated a moderate potential ecological risk from the studied HMs in MA and a low potential ecological risk in TA, and the results of RI also suggested that the soil was most heavily polluted by Cd. According to the spatial distribution maps of HM, contamination hot-spots were primarily located near mining-related high-pollution plants. Based on the results, policy recommendations are proposed related to brownfield management in urban planning.

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“…Alguns autores recomendam a agitação por 24 horas para garantir o estabelecimento do equilíbrio de adsorção (PETRUZELLI et al, 1985). Na maioria dos trabalhos de adsorção em solos tropicais publicados, constata-se que se tem utilizado este tempo de agitação (SOARES, 2004;MELLIS et al, 2004;SILVEIRA et al 2003, DIAS et al, 2001CASAGRANDE et al 2004;ALLEONI, et al, 2005;VEGA et al, 2006). Porém, nos últimos anos, alguns autores adotaram o tempo de agitação de 1 hora para se estudar a adsorção de metais em solos tropicais (MOREIRA, 2004;FONTES e Gomes, 2003).…”

Section: Introductionunclassified

Influência do tempo de agitação na adsorção de Cd, Cu, Ni e Zn em latossolo tratado com lodo de esgoto

Mellis

Rodella

2008

Bragantia

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RESUMOO objetivo deste trabalho foi avaliar o efeito do tempo de agitação no equilíbrio de adsorção em amostra de um Latossolo não tratado e tratado com lodo de esgoto da estação de tratamento (ETE) de Barueri, coletadas na camada 0-0,2 m. A influência do tempo de agitação na adsorção foi avaliada através da adição de 20 mL do eletrólito suporte Ca (NO 3 ) 2 0,01 mol L -1 , em 2 g de terra, agitadas por 1 e 24 horas em triplicata contendo concentrações crescentes de cada metal. Os resultados foram avaliados através do teste de comparação de curvas (Teste F). De maneira geral, as amostras agitadas por 24 horas adsorveram mais metais que as amostras agitadas por 1 hora. Pelos resultados, permite-se concluir que para as amostras de solo estudadas o tempo de agitação de 24 horas é o mais adequado para a obtenção da adsorção real dos metais estudados.Palavras-chave: sorção, tempo de equilíbrio, metais pesados. ABSTRACT INFLUENCE OF EQUILIBRIUM TIME IN Cd, Cu, Ni e Zn ADSORPTION ON SLUDGE-AMENDED SOIL SAMPLESThe objective of the present paper is to evaluate the influence of equilibrium time in metal adsorption on sludge-amended soil samples (0-0,2 m) collected in a sewage sludge trial. Soil samples (2.00 g) were shaked during 1 and 24 h with 20 mL of Ca(NO 3 ) 2 0,01 mol L -1 solution containing increasing concentrations of Cd, Cu, Ni and Zn. Adsorption isotherms for 1 and 24 h were compared using the F test. In general greater amounts of metals were adsorbed when a 24h-shaking time was used except for cadmium in sludge-amended sample. It is recommended a 24-h shaking period for equilibrium.

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Competitive sorption and desorption of heavy metals in mine soils: Influence of mine soil characteristics

Cited by 175 publications

References 38 publications

Mobility of Cr, Pb, Cd, Cu and Zn in a loamy sand soil: A comparative study

Mobility of Cr, Pb, Cd, Cu and Zn in a loamy sand soil: A comparative study

Investigating Heavy Metal Pollution in Mining Brownfield and Its Policy Implications: A Case Study of the Bayan Obo Rare Earth Mine, Inner Mongolia, China

Influência do tempo de agitação na adsorção de Cd, Cu, Ni e Zn em latossolo tratado com lodo de esgoto

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