Heavy-Metal bioavailability and Chelate mobilization efficiency in an assisted phytoextraction process by sesbania sesban (L.) Merr
Journal
Communications in Soil Science and Plant Analysis
Journal Volume
42
Journal Volume
42
Journal Issue
2
Journal Issue
2
Pages
231-245
Start Page
231
End Page
245
ISSN
15322416
Date Issued
2011-01
Author(s)
Abstract
Chelate-induced phytoextraction is an innovative technique for cleaning metalcontaminated soil. The present study evaluates the degree of metal mobilization in soil and enhancement of phytoextraction of cadmium (Cd), lead (Pb), and zinc (Zn) by Sesbania sesban (L.) Merr. from artificially contaminated soil by application of ethylenediaminetetraacetic acid (EDTA). After 30 days of plant growth, the pots were divided into three sets (0.0, 2.5, and 5.0 mmol EDTA per kg soil). Experimental results indicated that levels of diethylenetriaminepentaacetic acid (DTPA)-extractable metals and metals in the leachate decreased as the EDTA dose increased. Plant growth parameters and total chlorophyll contents in the plants with EDTA applied were less than those of control. However, EDTA application significantly reduced metal accumulation in root and increased metal accumulation in the shoot of plants; similar results were obtained for the bioconcentration factor and translocation factor. The application of 5 mmol EDTA kg-1 to metal-spiked soil may be an efficient alternative for the chemically enhanced phytoextraction by S. sesban.
Subjects
Leaching
Metal accumulation
Spiked soil
Translocation
Type
journal article