EDTA-induced phytoextraction of lead and barium by brachiaria (B. decumbens cv. Basilisk) in soil contaminated by oil exploration drilling waste
| Autor: | André Fernão Martins de Andrade, Nelson Moura Brasil do Amaral Sobrinho, Fabiana Soares dos Santos, Marcio Osvaldo Lima Magalhães, Alfredo Tolón-Becerra, Leilane da Silva Lima |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Acta Scientiarum: Agronomy, Vol 36, Iss 4, Pp 495-500 (2014) |
| Druh dokumentu: | article |
| ISSN: | 1679-9275 1807-8621 75042487 |
| DOI: | 10.4025/actasciagron.v36i4.18172 |
| Popis: | The phytoextraction of heavy metals using chelating agents has been widely studied for the remediation of contaminated soils. To evaluate the efficiency of EDTA-induced phytoextraction of Ba and Pb using Brachiaria decumbens for the remediation of soil contaminated by oil well drilling and exploration waste, an experiment was conducted by applying a single dose (6 mmol EDTA kg-1 soil) and split doses of EDTA (three applications of 2 mmol EDTA kg-1 soil). The samples were subjected to sequential extractions using the method proposed by Ure et al. (1993) as modified by Rauret et al. (1999).The application of EDTA did not influence the distribution of Ba in various chemical fractions of the soil. The dry matter production did not differ significantly between the treatments and the control, thereby demonstrating the tolerance of plants to the experimental conditions. The absorption of Pb by plants was influenced by the application of EDTA. The application of a single dose of EDTA influenced the absorption of Pb and its translocation to the aerial plant parts. The application of split doses favoured higher accumulation of Pb in roots. Because of its tolerance to heavy metals and EDTA, B. decumbens has the potential to be used in phytostabilisation. |
| Databáze: | Directory of Open Access Journals |
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