cinética de solubilização de metais pesados por ácidos orgânicos em solos tratados com lodo de esgoto kinetics of heavy metal solubilization by organic acids in sludge-treated soils
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2007
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Abstract
A presença de ligantes orgânicos na rizosfera tem importante papel no processo de solubilização de metais pesados em solos tratados com lodo de esgoto. Ácidos orgânicos de baixo peso molecular exsudados por raízes e, ou, liberados por microrganismos são considerados agentes mobilizadores desses metais. No presente estudo, determinou-se a cinética de solubilização de Cu, Cr, Ni e Zn em solos tratados com lodo de esgoto, utilizando solução com mistura de quatro ácidos orgânicos (acético, cítrico, lático e oxálico) preparada para obter concentração final de 0,05 e 0,10 mol L-1. A extração foi feita segundo o método de "batch". A solução 0,10 mol L-1 de ácidos orgânicos extraiu maiores quantidades de Cu, Cr, Ni e Zn do que a solução 0,05 mol L¹. A cinética de solubilização apresentou duas fases: uma inicial, com rápida liberação dos metais, seguida de outra mais lenta, tendendo ao equilíbrio. As constantes de velocidade de solubilização mais altas foram observadas para Ni e Zn, seguidos de Cu e Cr. Os valores para o reservatório lábil variaram entre 2 e 15 % do total de cada metal pesado estudado. A porcentagem que este reservatório representou, em relação ao total, obedeceu à ordem: Zn > Cu @ Ni > Cr.
The presence of organic ligands in the rhizosphere plays an important role in heavy metal solubilization in soils treated with sewage sludge. Low molecular weight organic acids exuded by roots and/or released by microorganisms are considered mobilizing agents of these metals. The present study determined Cd, Cu, Cr, Ni, and Zn solubilization kinetics in sewage sludge-treated soils using a mixture of four organic acids (acetic, citric, lactic, and oxalic) in 0.05 and 0.10 mol L-1 solutions. Based on the batch extraction method the 0.10 mol L-1 solution extracted greater quantities of Cu, Cr, Ni and Zn. Two phases of solubilization kinetics were observed: an initial one of fast metal release, followed by a slower one tending to equilibrium. The highest velocity constants were observed for Ni and Zn, followed by Cu and Cr. The values calculated for the labile pool varied from 2 to 15% of the total content of each metal under study. The percentage of this metal pool in relation to the total content followed the order: Zn > Cu @ Ni > Cr.
The presence of organic ligands in the rhizosphere plays an important role in heavy metal solubilization in soils treated with sewage sludge. Low molecular weight organic acids exuded by roots and/or released by microorganisms are considered mobilizing agents of these metals. The present study determined Cd, Cu, Cr, Ni, and Zn solubilization kinetics in sewage sludge-treated soils using a mixture of four organic acids (acetic, citric, lactic, and oxalic) in 0.05 and 0.10 mol L-1 solutions. Based on the batch extraction method the 0.10 mol L-1 solution extracted greater quantities of Cu, Cr, Ni and Zn. Two phases of solubilization kinetics were observed: an initial one of fast metal release, followed by a slower one tending to equilibrium. The highest velocity constants were observed for Ni and Zn, followed by Cu and Cr. The values calculated for the labile pool varied from 2 to 15% of the total content of each metal under study. The percentage of this metal pool in relation to the total content followed the order: Zn > Cu @ Ni > Cr.
| Reference Key |
pires2007revistacintica
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| Authors | ;Adriana Marlene Moreno Pires;Maria Emília Mattiazzo |
| Journal | Revista de saude publica |
| Year | 2007 |
| DOI |
10.1590/S0100-06832007000100015
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