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Single and mixed chelants-assisted phytoextraction of heavy metals in municipal waste dump soil by castor

Authors :
Ishaq S. Eneji
Julius U. Naku
Raymond A. Wuana
Source :
Advances in environmental research. 5:19-35
Publication Year :
2016
Publisher :
Techno-Press, 2016.

Abstract

The phytoextraction of some toxic heavy metals from municipal waste dump soil by castor plant (Ricinus communis) was tested under natural and single or mixed chelant-assisted scenarios in pot microcosms. A sandy loam with total metal contents (mg/kg): Cd (84.5), Cu (114.5), Ni (70.3), Pb (57.8), and Zn (117.5), was sampled from an active dumpsite in Calabar, Nigeria and used for the study. Castor (small seed variety) was grown under natural phytoextraction or single/binary chelant (citric acid, oxalic acid, and EDTA) applications (5-20 mmol/kg soil) for 63 days. Castor exhibited no visual phytotoxic symptoms with typically sigmoid growth profiles at the applied chelant doses. Growth rates, however, decelerated with increase in chelant dose. Post-harvest biomass yields were higher under chelant application than for natural phytoextraction. Both root and shoot metal concentrations (mg/kg) increased quasilinearly and significantly (p

Details

ISSN :
22341722
Volume :
5
Database :
OpenAIRE
Journal :
Advances in environmental research
Accession number :
edsair.doi...........67e111a7406fe92900026b64c0649d5d