EDTA-enhanced phytoremediation of lead contaminated soil by Bidens maximowicziana.
Phytoremediation is a potential cleanup technology for the removal of heavy metals from contaminated soils. Bidens maximowicziana is a new Pb hyperaccumulator, which not only has remarkable tolerance to Pb but also extraordinary accumulation capacity for Pb. The maximum Pb concentration was 1509.3 mg/kg in roots and 2164.7 mg/kg in overground tissues. The Pb distribution order in the B. maximowicziana was: leaf > stem > root. The effect of amendments on phytoremediation was also studied. The mobility of soil Pb and the Pb concentrations in plants were both increased by EDTA application. Compared with CK (control check), EDTA application promoted translocation of Pb to overground parts of the plant. The Pb concentrations in overground parts of plants was increased from 24.23-680.56 mg/kg to 29.07-1905.57 mg/kg. This research demonstrated that B. maximowicziana appeared to be suitable for phytoremediation of Pb contaminated soil, especially, combination with EDTA.
Wang
Hong-qi
HQ
College of Water Sciences, Beijing Normal University, Beijing 100875, China. vopt976@yahoo.com
Lu
Si-jin
SJ
Li
Hua
H
Yao
Zhi-hua
ZH
D031176:Bidens / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D001673:Biodegradation, Environmental / Q000187:drug effects; D002614:Chelating Agents / Q000494:pharmacology*; D019343:Citric Acid / Q000494:pharmacology; D004492:Edetic Acid / Q000494:pharmacology*; D007854:Lead / Q000378:metabolism*; D010710:Phosphates / Q000494:pharmacology; D035261:Plant Components, Aerial / Q000187:drug effects / Q000378:metabolism; D018517:Plant Roots / Q000187:drug effects / Q000378:metabolism; D012989:Soil Pollutants / Q000378:metabolism*
D002614:Chelating Agents; D010710:Phosphates; D012989:Soil Pollutants; D019343:Citric Acid; D007854:Lead; D004492:Edetic Acid; C018279:sodium phosphate