Insights into Heavy Metals Leakage in Chelator-Induced Phytoextraction of Pb- and Tl-Contaminated Soil

Xuexia Huang, Dinggui Luo, Xiangxin Chen, Lezhang Wei, Yu Liu, Qihang Wu, Tangfu Xiao, Xiaotao Mai, Guowei Liu and Lirong Liu
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Xuexia Huang: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Dinggui Luo: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Xiangxin Chen: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Lezhang Wei: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Yu Liu: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Qihang Wu: Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou 510006, China
Tangfu Xiao: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Xiaotao Mai: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Guowei Liu: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Lirong Liu: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China

IJERPH, 2019, vol. 16, issue 8, 1-14

Abstract: Chelators including DTPA (diethylene triamine pentaacetic acid) and oxalic acid were selected for inducing phytoextraction of heavy metals (HMs) from Pb-, Tl-, and Pb-Tl- contaminated soil, in which heavy metals leakage was highly remarkable. Results showed that compared with the control group without chelating agent under planting conditions, the extraction efficiency (i.e., uptake coefficient) of Pb, Tl increased by 86%, 43% from Pb-Tl- contaminated soil in the presence of oxalic acid, and there was no significant change in heavy metal leakage under rainfall conditions. It was the best phytoremediation scheme in this work. Under rainfall conditions, the HMs concentration in the leachate showed a linear decreasing trend. Acid rain promoted the leakage of heavy metals, and the average leached amount of Tl increased by 1.47 times under acid rain conditions. However, for Pb, DTPA was the main influencing factor, followed by acid rain.

Keywords: phytoextraction; thallium; lead; maize; DTPA; oxalic acid; leaching (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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