Dessorção e lixiviação de chumbo em espodossolo tratado com agentes quelantes

Freitas, Eriberto Vagner de Souza; Nascimento, Clístenes Williams Araújo do; Biondi, Caroline Miranda; Silva, Edvane Borges da; Souza, Adaílson Pereira de

doi:10.1590/s0100-06832009000300005

Cited by 6 publications

(2 citation statements)

References 25 publications

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“…In addition to its contribution to the reduction in crop productivity, the accumulation of HMs in the soil can indirectly affect human and animal health (Freitas et al 2009). Lead (Pb) is a toxic HM with, usually, a low solubility in soils and occurs in the soil solution predominantly as Pb 2?…”

Section: Introductionmentioning

confidence: 99%

Arbuscular mycorrhiza confers Pb tolerance in Calopogonium mucunoides

et al. 2011

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Heavy metals (HMs) are environmental pollutants of great concern to humans because of their high potential toxicity. Lead is a HM that is present in the soil in very small amounts, but anthropogenic activities have increased its content in some locations, which can make these areas unproductive or inappropriate for crop production. However, there are some plants that can grow in contaminated soils and, thus, can be useful for the removal or stabilisation of such contaminants. In addition, plants that are not able to tolerate high concentrations of HMs in the soil can become tolerant or increase their performance when associated with arbuscular mycorrhizal (AM) fungi. Accordingly, this study was carried out to verify whether the inoculation of Glomus etunicatum, an AM fungus species, in Calopogonium mucunoides would influence plant tolerance to increasing concentrations of Pb in the soil. The experimental design was completely randomised, in a 2 9 4 factorial design, and the treatments consisted of inoculation (or not) with the AM fungus, G. etunicatum, and the addition of four Pb concentrations (0, 250, 500 or 1,000 mg kg -1 ) to the soil. The results showed that the association of C. mucunoides with G. etunicatum promoted biomass production, and nutrient uptake (P, S and Fe) was also positively influenced by mycorrhization. The malondialdehyde content was higher in non-mycorrhizal leaves, suggesting a reduction in the damage to membranes by lipid peroxidation in plants associated with mycorrhizae. However, the Pb concentration in the shoots did not differ between the mycorrhizal and non-mycorrhizal plants. The results of our study suggest that the AM symbiosis can be considered very effective in contributing to the tolerance of C. mucunoides to Pb.

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Section: Introductionmentioning

confidence: 99%

Arbuscular mycorrhiza confers Pb tolerance in Calopogonium mucunoides

et al. 2011

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“…1). EDTA, NTA, and citric acid provoked a 48-, 34-, and fourfold increase in the soil solution contents of Pb, respec- (Ruley et al 2006;Freitas et al 2009). The solubilization of Pb by citric acid was much lower than EDTA and NTA.…”

Section: Effect Of Chelants On the Solubility Of Pb In Soilmentioning

confidence: 96%

Phytoextraction of Lead from Soil from a Battery Recycling Site: The Use of Citric Acid and NTA

Araújo

Nascimento

2009

Water Air Soil Pollut

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Phytoextraction is a soil remediation technique involving plants that concentrate heavy metals in their shoots, which may be removed from the area by harvest. The application of synthetic chelants to soil increases metal solubility, and therefore enhances phytoextraction. However, synthetic chelants degrade poorly in soil, and metal leaching poses a threat to human and animal health. The aim of this study is to assess the use of two biodegradable chelants (citric acid and nitrilotriacetic acid (NTA)) for Pb phytoextraction by maize from a soil contaminated by battery-casing disposal. In order to assess the behavior of a nondegradable chelant, ethylenediaminetetraacetic acid (EDTA) was also included in the experiment. The chelants NTA and EDTA were applied to soil pots at rates of 0, 3, 5, 7, and 10 mmol kg −1 of soil. The rates used to citric acid were 0, 5, 10, 15, and 30 mmol kg −1 . Maize plants were grown for 72 days and chelants were applied 9 days before harvest. Soil samples were extracted with CaCl 2 to assess the Pb solubility after chelants application. The results showed that NTA was more efficient than citric acid to solubilize Pb from soil; however, citric acid promoted higher net removal of Pb (120 mg pot −1 ) than NTA (57 mg pot −1 ). Thus, the use of citric acid, a biodegradable organic acid, could be feasible for enhancing the phytoextraction of Pb from the site studied with no environmental constraints.

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