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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064


KEDE, Maria Luiza F. M. et al. Study of lead behaviour in Brazillian latosoils treated with phosphates: contributions to the remediation of contaminated sites. Quím. Nova [online]. 2008, vol.31, n.3, pp.579-584. ISSN 0100-4042.

Phosphates have been used for lead immobilization in soils but the influence of soil type is not fully understood. In this work, lead chemical behaviour in two Brazilian latosoils (LA and LV) was studied via treatment with phosphates. The Pb concentration in Toxicity Characteristic Leaching Procedure (TCLP) solutions was decreased in all treatments. After treatment with H3PO4 the Pb concentration in the LA remained within the regulatory limit established by EPA. The ecotoxicological results with Daphnia pulex showed that this treatment reduced the lead bioavailability. Sequential extraction analyses showed that the lead was transferred from the most available to the residual fraction. Relevant decrease of soluble lead was observed in all phosphate treatments.

Keywords : remediation; lead; phosphates.

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