EDTA assisted phytorremediation of a Pb contamined soil: metal leaching and uptake by jack beans

Authors

  • Mariana Bassetto Gabos USP; ESALQ; Programa de Pós-Graduação em Solos e Nutrição de Plantas
  • Cleide Aparecida de Abreu IAC; CPD de Solos e Recursos Ambientais
  • Aline Reneé Coscione IAC; CPD de Solos e Recursos Ambientais

DOI:

https://doi.org/10.1590/S0103-90162009000400012

Keywords:

Canavalia ensiformis L., lead, phytoremediation, chelant

Abstract

Lead (Pb) is one of the main soil contaminants. It is also of difficult phytoremediation due to its low solubility and high retention on soil particles. EDTA application to soil is a strategy to increase heavy metal phytoextraction, but such chelants usually cause phytotoxicity and metal leaching side effects. Therefore, these research work objectives were to evaluate the effects of single (0.5 g kg-1) and split (0.25 + 0.25 g kg-1) EDTA application on Pb uptake by jack beans (Canavalia ensiformis L.) as well as on Pb vertical movement in a Pb contaminated soil material. Two sets of experiments were carried out under greenhouse conditions: in the first one, plants were grown in 3L-pots filled with a Pb-contaminated soil to evaluate Pb uptake by plants; for the second experiment, PVC-columns (42 cm height) were used to evaluate soil Pb leaching: the upper half-column (20 cm) was filled up with Pb-contaminated soil (1800 mg kg-1) whereas the lower half-column (20 cm) was filled with clean soil. Ten 60 mm-rainfalls with a duration of five hours were simulated by dropping distilled water on the top of columns, and leachates were collected for chemical analysis. Plants did not show any visual Pb toxicity symptoms or reduction in dry matter yield. Nevertheless, Pb uptake by jack beans regarded as total plant Pb accumulation was higher in EDTA-treated plants. Vertical Pb movement was observed mostly for the single EDTA application. EDTA addition to the soil favor Pb-phytoextraction by jack beans and the split EDTA application decrease the metal leaching, indicating less risk of environmental contamination.

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Published

2009-08-01

Issue

Section

Soils and Plant Nutrition

How to Cite

EDTA assisted phytorremediation of a Pb contamined soil: metal leaching and uptake by jack beans . (2009). Scientia Agricola, 66(4), 506-514. https://doi.org/10.1590/S0103-90162009000400012