Abstract
The soils enriched with elements potentially toxic (EPT) have limited use for agricultural purposes. In this case, the corresponding site should be isolated and then procedures for decontamination or stabilization of EPT in the soils must be applied. The objective of this study was to evaluate the influence of adding different rates of phosphate on the bioavailability of mercury (Hg) and lead (Pb) in a contaminated soil, using lettuce grown on this soil. For this, different phosphorus rates were used to control bioavailability of Hg and Pb, in lettuce plants. The element concentrations were analyzed by instrumental neutron activation analysis (INAA), and the results were compared to control treatment to verify the reduction of absorption of Hg and Pb. The Hg concentration in shoots decreased with the application of 250 mg kg-1 of P and Pb with the application of 250 to 1000 mg kg-1 of P. The accumulation of Hg and Pb in shoots of lettuce increased as a function of P demonstrating the inefficiency of application of P in the absorption of these elements.
Highlights
In most cases, the concentration of microelements and toxic elements found in soil does not pose a risk to the environment
The objective of this study was to evaluate the influence of adding different rates of phosphate on the bioavailability of mercury (Hg) and lead (Pb) in a contaminated soil, using lettuce grown on this soil
The accumulation of Hg and Pb in shoots of lettuce increased as a function of P demonstrating the inefficiency of application of P in the absorption of these elements
Summary
The concentration of microelements and toxic elements found in soil does not pose a risk to the environment. Lead, mercury and arsenic, classified as elements potentially toxic (EPT) are a huge problem for the public health. When they are present in the soil may persist due to their long life-time in soils, and could be readily available for plants, especially in acid soils, and being transferred to the human food chain. Soils enriched with EPT have limited use for agricultural purposes. In this case, the corresponding site should be isolated and procedures for decontamination or stabilization of EPT in the soils must be applied (TREVIZAM et al, 2010)
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