Enhanced Phytoextraction for Co-contaminated Soil with Cd and Pb by Ryegrass (Lolium perenne L.)
- Southeast University, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment (China)
- Geological Survey Institute of Jiangsu Province (China)
A pot experiment was conducted to investigate the effect of three additives – citric acid (CA), polyaspartic acid (PASP), and FeCl{sub 3} – on the phytoextraction efficiency of cadmium (Cd) and lead (Pb) by ryegrass (Lolium perenneL.) from artificially contaminated soils with different heavy metal concentrations. The results showed that as the concentration of pollutants increased, the TI (tolerance index) and BCF (bio-concentration factor) of ryegrass gradually increased only when FeCl{sub 3} was applied. FeCl{sub 3} also exhibited the most significant biomass enhancement and heavy metal accumulation of ryegrass, as well as the highest phytoextraction efficiency in heavily-polluted soils. The overall orders of the optimal phytoextraction efficiency for the three additives in terms of their MER (metal extraction ratio) were: FeCl{sub 3} > PASP > CA. Therefore, FeCl{sub 3} can be used to improve the Cd and Pb phytoextraction efficiency of ryegrass in heavily-polluted soils.
- OSTI ID:
- 22933503
- Journal Information:
- Bulletin of Environmental Contamination and Toxicology, Journal Name: Bulletin of Environmental Contamination and Toxicology Journal Issue: 1 Vol. 103; ISSN 0007-4861; ISSN BECTA6
- Country of Publication:
- United States
- Language:
- English
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