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Open AccessArticle

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

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School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
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Linköping University—Guangzhou University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou 510006, China
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Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou 510006, China
4
Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2019, 16(8), 1328; https://doi.org/10.3390/ijerph16081328
Received: 21 February 2019 / Revised: 31 March 2019 / Accepted: 10 April 2019 / Published: 12 April 2019
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. View Full-Text
Keywords: phytoextraction; thallium; lead; maize; DTPA; oxalic acid; leaching phytoextraction; thallium; lead; maize; DTPA; oxalic acid; leaching
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Huang, X.; Luo, D.; Chen, X.; Wei, L.; Liu, Y.; Wu, Q.; Xiao, T.; Mai, X.; Liu, G.; Liu, L. Insights into Heavy Metals Leakage in Chelator-Induced Phytoextraction of Pb- and Tl-Contaminated Soil. Int. J. Environ. Res. Public Health 2019, 16, 1328.

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