Comparison of the ability of organic acids and EDTA to enhance the phytoextraction of metals from a multi-metal contaminated soil.
Chelates have been shown to enhance the phytoextraction of metal from contaminated soil. In this study, we evaluated the ability of chelates to enhance the phytoextraction of metals by barnyard grass (Echinochloa crus-galli) from soils contaminated with multiple metals. The results revealed that EDTA increased the ability of barnyard grass to take up Cd, Cu and Pb, but that it resulted in increased soil leaching. Conversely, citric acid induced the removal of Cd, Cu and Pb from soil without increasing the risk of leaching. Furthermore, E.crus-galli showed no signs of phytotoxicity in response to treatment with citric acid, whereas its shoot growth decreased in response to treatment with EDTA (p < 0.05). Taken together, these results demonstrate that citric acid is a good agent for the enhancement of the phytoextraction of metals.
Kim
Sung-Hyun
SH
Division of Eco Science, Ewha Womans University, Seoul 120-750, Korea.
Lee
In-Sook
IS
D000143:Acids / Q000737:chemistry; D018533:Biomass; D002614:Chelating Agents / Q000737:chemistry*; D019343:Citric Acid / Q000737:chemistry; D031747:Echinochloa / Q000737:chemistry / Q000378:metabolism*; D004492:Edetic Acid / Q000737:chemistry*; D004787:Environmental Pollution / Q000032:analysis*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007723:Korea; D019216:Metals, Heavy / Q000032:analysis* / Q000378:metabolism*; D009930:Organic Chemicals / Q000737:chemistry*; D018517:Plant Roots / Q000737:chemistry; D010944:Plants / Q000378:metabolism*; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis*
D000143:Acids; D002614:Chelating Agents; D019216:Metals, Heavy; D009930:Organic Chemicals; D012987:Soil; D012989:Soil Pollutants; D019343:Citric Acid; D004492:Edetic Acid