Document Type : Research Paper

Authors

1 Assist. Professor, Department of Soil Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran

2 Assoc. Professor, Higher Education Complex of Shivan, Shirvan, Iran

Abstract

Heavy metals are one of the most important environmental contaminants, particularly in soil and water sources. Among heavy metals, lead is one of the most challenging toxic contaminants. Using lead-contaminated soils requires their decontamination and improvement. The objective of this study was to investigate the possibility of lead decontamination from soil and to estimate the optimal clean up time using Portulaca oleracea L. and Amaranthus retroflexus. For this purpose, a completely randomized design with five treatments of 30 (standard), 150, 300, 600 and 1200 mg/kg each with three replicates was performed. The results indicated that for both plants a non-linear positive relation exists between the lead concentrations in soil and that accumulated in plant roots and shoots. The highest extracted lead which was accumulated in roots of Portulaca oleracea L. and Amaranthus retroflexus were 173.39 and 149.76 mg/kg, and in their shoots were 20.01 and 5.82 mg/kg, respectively. Translocation factor was obtained from 0.62 to 0.12 for Portulaca oleracea L. and from 0.14 to 0.04 for Amaranthus retroflexus. The translocation factor in both plants was obtained to be less than one, indicating poor lead transfer from root to the shoot. Due to the ability of the above plants to absorb large amounts of lead from the root zone, high plant yield and the ability to accumulate lead in harvestable organs, both plants were highly effective for remediation of lead from soil surface up to concentrations several times of the allowable lead concentration. However, due to the clean-up time and the amount of biomass produced, the Amaranthus retroflexus had a better ability to remediate contaminated soils.

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