Enhancing bioavailability of lead for phytoremediation of contaminated soils

Subject Areas : Genetic

Zahra  Arabi ¹ (Dep. Soil Science, Azad University, Science and Research Branch, Tehran, Iran.)
مهدی  Homaee ² (Dep. Soil Science, Tarbiat Modares University, Tehran, Iran.)
M.E  Asadi ³ (Soil and Water Research Scientist, Gorgan, Iran.)

Received: 2008-11-22 Accepted : 2009-04-08 Published : 2009-09-16

Keywords: Soil Pollution, radish, Lead, phytoextraction, Synthetic chelators,

Abstract :

In this study the influence of enhancing synthetic chelate (HEDTA) were investigated on lead (Pb) solution in contaminated soils. The Pb phytoextraction capability of radish (Raphanus sativus L.) before and after chelating was also studied. The experiment was conducted in a randomized complete factorial design, with three replicated for each treatment. The Pb treatments (as PbCl2) were consisted of 0 (control), 50, 100, 600 and 1000 mg Pb kg-1 soil. When plants were fully grown, the chelating agent HEDTA was added to Pb treatments in concentration of 1.5, 5 and 6 mMkg-1 soil, respectively. The control treatments was received no chelate. Ten days later, some samples were taken from the plants and soils to measure lead concentrations after applying the chelate. The results indicated that in all treatments, the concentrations of soluble Pb in soil were more than the control treatment. In all treatments, Pb concentrations in plant shoots and roots were increased by increasing Pb concentrations in the soil solution. In current study, Pb concentration in radish shoots and roots, after enhancing HEDTA was larger than control. The collected data were also showed that Pb uptake by radish roots was larger than that of shoots.

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