The impact of EDTA, citric acid and poultry manure extract on phytoremediation of Pb by corn in a sandy loam contaminated soil

Document Type : Original Article

Abstract

The plants which can be used to clean up the heavy metals contaminated soils but, for this reason may take years or even decades, because of this chemical and biological treatment uses for phytoremediation. In this study, the potential of corn (hybrid KSC. 704) for accumulation of lead was conducted as an experiment using a completely randomized design with three replications in a greenhouse experiment in a sandy loam soil contaminated with Pb. Citric acid and EDTA were used at concentrations level 0, 0.5 and 1 mmol kg-1 soil and poultry manure extract 0, 0.5 and 1 g kg-1 soil. The results showed that the effect of chelating agents on the shoots and roots Pb concentration, shoots absorption Pb and biological concentration factor (BCF) was (p <0.05) significant. With increasing chelators concentration shoots dry weight nonsignificantly decreased. The results showed that application of 0.5 and 1 mmol kg-1 soil concentrations of EDTA were significantly increased Pb concentration in corn shoots 164 and 260 (%) (significant for 1 mmol kg-1 of EDTA) times more than the control, respectively. Application of 1 mmol kg-1 soil citric acid and 1 g kg-1 soil poultry manure extract were increased Pb concentration in corn shoots 122 and 116 (%) times more than the control, respectively. Application of 1 mmol kg-1 soil EDTA and citric acid significantly increased bioconcentration factor 145 and 140 (%) times more than the control, respectively. Application of 1 mmol kg-1 soil EDTA significantly increased translocation factor 207 (%) times more than the control. Since inordinate use of chelators can make more Pb availibility in soil without increasing plant uptake, therefore application of more concentration level not recommend.

Keywords

References

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Applied Soil Research
Volume 4, Issue 2
February 2017
Pages 38-46

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History

  • Receive Date: 06 April 2016
  • Revise Date: 11 December 2016
  • Accept Date: 07 February 2017

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