2006
DOI: 10.1590/s0103-90162006000300010
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Abstract: Phytoremediation of heavy metals is a biotechnology that extracts metals from soils and transfer them to plant. As hyperaccumulator species have demonstrated low potential for commercial phytoextraction, synthetic chelates have been successfully used to induce accumulation of metals by highbiomass plants. However, they pose serious environmental drawbacks regarding excessive amount of metals solubilized. In search for synthetic chelate-alternatives, this paper evaluate the performance of DTPA, EDTA, citric aci… Show more

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Cited by 45 publications
(19 citation statements)
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“…The N-NH 4 + form was predominantly removed during the first 24 hours compared to N-NO 3 -form which was mainly removed between 8 and 72 hours. According to Nelson et al [35], the nitrogen uptake rate by P. stratiotes was higher for N-NH 4 + than for N-NO 3 -. In our study the nitrogen content in leaves rapidly increased during the first 2 to 8 hours for all treatments ( Figure 5).…”
Section: Nitrogen Uptake By Pistia Stratiotesmentioning
confidence: 93%
See 1 more Smart Citation
“…The N-NH 4 + form was predominantly removed during the first 24 hours compared to N-NO 3 -form which was mainly removed between 8 and 72 hours. According to Nelson et al [35], the nitrogen uptake rate by P. stratiotes was higher for N-NH 4 + than for N-NO 3 -. In our study the nitrogen content in leaves rapidly increased during the first 2 to 8 hours for all treatments ( Figure 5).…”
Section: Nitrogen Uptake By Pistia Stratiotesmentioning
confidence: 93%
“…Although EDTA is effective in the mobilization of metals in soils, EDTA and EDTAmetal complexes can be toxic to plants and persist in the environment [3]. The leaching of metal complexes through the soil profile could be prevented efficiently through the use of natural organic compounds such as low molecular weight organic acids (LMWOA) [4]. In addition to the leaching of metals, potentially toxic elements such as Al, Mn or Fe are also leached during mobilization of metals [5].…”
Section: Introductionmentioning
confidence: 99%
“…While there are numerous studies that deal with sorption capacity of biochars for heavy metals when applied to soil in light of phytoremediation perspective (Cao et al, 2009;Namgay et al, 2010;Uchimiya et al, 2011), studies regarding on leachability (through desorption or dissolution) of heavy metals from biochar and their bioavailability are virtually nonexistent. The heavy metals, however, are known to be desorbed by naturally occurring organic acids such as citric, oxalic, acetic, and lactic acids (Nascimento, 2006;Marchi, 2009) and dissolved organic carbon (Antoniadis & Alloway, 2002) from soils amended with sewage sludge. Regardless of equilibrium amounts of Cd adsorbed in an Andisol, more than 80% of Cd was desorbed with one time extraction with citric acid if its concentration was more than 0.1 M, and more than 90% was recovered if five soil pore volumes of 0.1 M citric acid were continuously run through the Cd-contaminated soil (Abe et al, 2004).…”
Section: Heavy Metal Leachability From Biocharmentioning
confidence: 99%
“…Para avaliar o efeito dos quelantes foram utilizadas as doses de 0, 2, 5, 10, 20 e 30 mmol kg -1 , aplicadas na forma sólida a 5 g do solo contaminado. Em seguida, foram adicionados 30 mL de uma solução de CaCl 2 10 mmol L -1 em tubos de centrífuga com capacidade para 50 mL (Nascimento, 2006). Para promover a dessorção do metal, as amostras foram dispostas em mesa horizontal e agitadas por um período de 24 h a 200 rpm.…”
Section: Methodsunclassified