Phytoremedation of heavy metal-contaminated soils: natural hyperaccumulation versus chemically enhanced phytoextraction

A - Papers appearing in refereed journals

Lombi, E., Zhao, F-J., Dunham, S. J. and McGrath, S. P. 2001. Phytoremedation of heavy metal-contaminated soils: natural hyperaccumulation versus chemically enhanced phytoextraction. Journal of Environmental Quality. 30 (6), pp. 1919-1926. https://doi.org/10.2134/jeq2001.1919

AuthorsLombi, E., Zhao, F-J., Dunham, S. J. and McGrath, S. P.
Abstract

A pot experiment was conducted to compare two strategies of phytoremediation: natural phytoextraction using the Zn and Cd hyperaccumulator Thlaspi caerulescens J. Presl & C. Presl versus chemically enhanced phytoextraction using maize (Zea mays L.) treated with ethylenediaminetetraacetic acid (EDTA). The study used an industrially contaminated soil and an agricultural soil contaminated with metals from sewage sludge. Three crops of T. caerulescens grown over 391 d removed more than 8 mg kg(-1) Cd and 200 mg kg(-1) Zn from the industrially contaminated soil, representing 43 and 7% of the two metals in the soil. In contrast, the high concentration of Cu in the agricultural soil severely reduced the growth of T. caerulescens, thus limiting its phytoextraction potential. The EDTA treatment greatly increased the solubility of heavy metals in both soils, but this did not result in a large increase in metal concentrations in the maize shoots. Phytoextraction of Cd and Zn by maize + EDTA was much smaller than that by T. caerulescens from the industrially contaminated soil, and was either smaller (Cd) or similar (Zn) from the agricultural soil. After EDTA treatment, soluble heavy metals in soil pore water occurred mainly as metal-EDTA complexes, which were persistent for several weeks. High concentrations of heavy metals in soil pore water after EDTA treatment could pose an environmental risk in the form of ground water contamination.

KeywordsEDTA; ICP-AES; Ethylenediaminetetraacetic acid; Inductively coupled plasma atomic emission spectroscopy
Year of Publication2001
JournalJournal of Environmental Quality
Journal citation30 (6), pp. 1919-1926
Digital Object Identifier (DOI)https://doi.org/10.2134/jeq2001.1919
Open accessPublished as green open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or code443
512
Heavy metal uptake by plants
Project: 4323
Remidiation of metal contaminated soils by plants (PHYTOREM)
Soil protection and remediation by chemical and biological approaches
Project: 4431
Output statusPublished
Publication dates
OnlineNov 2001
ISSN0047-2425
PublisherAmerican Society of Agronomy (ASA)

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