EDTA-enhanced phytoremediation of heavy metal contaminated soil with Indian mustard and associated potential leaching risk

Wu, Longhua; Luo, Yongming; Xing, Xiaowei; Christie, Peter

doi:10.1016/j.agee.2003.09.002

Cited by 315 publications

(149 citation statements)

References 27 publications

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“…For metal leaching evaluation in soils treated with 10 mmol kg -1 of EDTA higher Pb mobility was observed with EDTA application (Sun et al, 2001). Similar results were also reported by Greman et al (2003), Liphadzi et al (2003), Tandy et al (2004), Wu et al (2004) and Hauser et al (2005). Studying the phytoremediation of a sewage-sludge metal-contaminated soil, some authors observed high Pb leaching in the soil profile when 0.5 g kg -1 of EDTA was applied.…”

Section: Effect Of Split Edta Application Upon the Pb-uptake By Jack supporting

confidence: 81%

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

Gabos¹,

Abreu

Puga

2009

Sci. agric. (Piracicaba, Braz.)

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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. Key words: Canavalia ensiformis L., lead, phytoremediation, chelant LIXIVIAÇÃO E ABSORÇÃO DE Pb PELO FEIJÃO-DE-PORCO ASSISTIDO PELA APLICAÇÃO DE EDTA NO SOLORESUMO: O chumbo (Pb) é um dos principais contaminantes de solo. Os processos de remediação são dificultados devido à alta retenção do elemento às partículas do solo. A utilização do EDTA para aumentar a fitoextração dos metais do solo tem apresentado bons resultados. Contudo, os quelantes podem causar efeitos indesejáveis como a fitotoxidez e a lixiviação do metal. Nesse sentido, avaliouse o efeito da aplicação única (0,5 g kg -1 ) e parcelada de EDTA (0,25 + 0,25 g kg -1 ) na absorção de Pb pelas plantas de feijão-de-porco (Canavalia ensiformis L.) e na movimentação vertical de Pb em solo contaminado, sob condições de casa de vegetação. Em um experimento, as plantas foram crescidas em vasos contendo 3 L de solo contaminado por Pb. No outro, utilizaram-se colunas de PVC com 42 cm de altura, preenchendo-se os primeiros 20 cm com solo contaminado com 1800 mg kg -1 de Pb, seguido de outros 20 cm, com amostra de solo não contaminado. Nesse experimento, foram feitas dez lixiviações com água em volume equivalente a uma chuva de 60 mm cada. As plantas não apresentaram sintomas visuais de toxicidade de Pb, nem diferença na produção de massa seca do feijão em função dos tratamentos aplicados. No entanto, a absorção de Pb foi superior para as plantas que r...

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Section: Effect Of Split Edta Application Upon the Pb-uptake By Jack supporting

confidence: 81%

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

Gabos¹,

Abreu

Puga

2009

Sci. agric. (Piracicaba, Braz.)

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“…It has indeed been observed that uptake of Zn by Brassica juncea was nearly unaffected by addition of EDTA to Zn-contaminated soil (pH 6.3) at concentrations that have theoretically little effect on the free Zn activity (buffered by the solid phase), although the soluble Zn concentrations strongly increased. [87] The DGT-measured fluxes (not measured) would probably also have increased considerably, as Zn-EDTA complexes -although not fully labile -contribute significantly to the DGT-flux (F. Degryse, unpubl. data).…”

mentioning

confidence: 99%

Predicting availability of mineral elements to plants with the DGT technique: a review of experimental data and interpretation by modelling

et al. 2009

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Environmental context. Total concentrations of mineral elements in soil bear little relation to their availability for plants. The DGT (diffusive gradients in thin-films) technique has been found to be a good predictor of trace metal uptake and P deficiency, though not consistently in all studies for all elements. This review examines the fundamental basis for the relation between DGT fluxes and plant uptake and assesses under which conditions this relation may break down.Abstract. In the DGT technique, elements are accumulated on a binding gel after their diffusive transport through a hydrogel. In this paper, we explore in more detail why -and under which conditions -DGT correlates with plant uptake. The theoretical considerations are illustrated with experimental results for metal uptake and toxicity, and for phosphorus deficiency. Strong correlations between DGT and plant uptake are predicted if the diffusive transport of the element from soil to the plant roots is rate-limiting for its uptake. If uptake is not limited by diffusive transport, DGT-fluxes and plant uptake may still correlate provided that plant uptake is not saturated. However, competitive cations may affect the plant uptake under these conditions, whereas they have no effect on the DGT flux. Moreover, labile complexes are not expected to contribute to the plant uptake if diffusion is not limiting, but they are measured with DGT. Therefore, if plant uptake is not limited by diffusion, interpretation of the observed correlation in terms of the labile species measured by DGT is inappropriate.

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“…Phytoextraction efficiency was related to both plant metal concentration and dry matter yield [27]. Fig.…”

Section: Resultsmentioning

confidence: 99%

EDTA-assisted phytoremediation of cadmium contaminated soil by Solanum nigrum L.

Li¹,

Xin²,

JianYong³

et al. 2017

Proceedings of the 2017 5th International Conference on Machinery, Materials and Computing Technology (ICMMCT 2017)

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Abstract.A pot experiment was performed to study the effect of EDTA (0, 1.5, 5.0 mmol/kg) on the cadmium (Cd) accumulation ability of Solanum nigrum L. grown in different Cd-contaminated soils (0,5,10,25, 50, 100 and 200 mg/kg). Meanwhile, soil Cd mobility was evaluated. Results showed that there were significant interactions between Cd and EDTA. Low EDTA dosage (1.5 mmol/kg) significantly alleviated Cd stress to S. nigrum L., although EDTA inhibited the growth of S. nigrum L. grown in non-contaminated soil. High EDTA dosage (5 mmol/kg) could deteriorate Cd stress to S. nigrum L. EDTA could significantly increase the mobility of soil Cd and the Cd content in plant. This research indicated that low EDTA dosage (1.5 mmol/kg) was efficient in assisting remediation of Cd contaminated soil by S. nigrum L. and could lessen second pollution.

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EDTA-enhanced phytoremediation of heavy metal contaminated soil with Indian mustard and associated potential leaching risk

Cited by 315 publications

References 27 publications

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

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

Predicting availability of mineral elements to plants with the DGT technique: a review of experimental data and interpretation by modelling

EDTA-assisted phytoremediation of cadmium contaminated soil by Solanum nigrum L.

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