Phytoextraction of Pb and Cu contaminated soil with maize and microencapsulated EDTA.
Chelate-assisted phytoextraction using agricultural crops has been widely investigated as a remediation technique for soils contaminated with low mobility potentially toxic elements. Here, we report the use of a controlled-release microencapsulated EDTA (Cap-EDTA) by emulsion solvent evaporation to phytoremediate soil contaminated with Pb and Cu. Incubation experiments were carried out to assess the effect of Cap- and non-microencapsulated EDTA (Ncap-EDTA) on the mobility of soil metals. Results showed EDTA effectively increased the mobility of Pb and Cu in the soil solution and Cap-EDTA application provided lower and more constant water-soluble concentrations of Pb and Cu in comparison with. Phytotoxicity may be alleviated and plant uptake of Pb and Cu may be increased after the incorporation of Cap-EDTA. In addition phytoextraction efficiencies of maize after Cap- and Ncap-EDTA application were tested in a pot experiment. Maize shoot concentrations of Pb and Cu were lower with Cap-EDTA application than with Ncap-EDTA. However, shoot dry weight was significantly higher with Cap-EDTA application. Consequently, the Pb and Cu phytoextraction potential of maize significantly increased with Cap-EDTA application compared with the control and Ncap-EDTA application.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China.
Zhiyi
Z
Xie
Longhua
L
Wu
Nengchang
N
Chen
Chengshuai
C
Liu
Yuji
Y
Zheng
Shengguang
S
Xu
Fangbai
F
Li
Yanling
Y
Xu
D001673:Biodegradation, Environmental; D003300:Copper / Q000737:chemistry / Q000378:metabolism*; D004339:Drug Compounding; D004492:Edetic Acid / Q000737:chemistry*; D007854:Lead / Q000737:chemistry / Q000378:metabolism*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000737:chemistry / Q000378:metabolism*; D013997:Time Factors; D003313:Zea mays / Q000737:chemistry / Q000187:drug effects / Q000254:growth & development* / Q000378:metabolism
D012987:Soil; D012989:Soil Pollutants; D007854:Lead; D003300:Copper; D004492:Edetic Acid