Phytoremediation of Pb contaminated soil with polymer-coated EDTA |
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| Authors: | Masaru Shibata Takayuki Konno Ryo Akaike Yong Xu Renfang Shen Jian Feng Ma |
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| Institution: | (1) Fertilizer Plant, Asahi Kasei Chemicals Corporation, Samejima 2-1, Fuji-shi, Shizuoka 416-8501, Japan;(2) Faculty of Agriculture, Kagawa University, Ikenobe 2393, Miki-cho, Kita-gun, Kagawa 761-0795, Japan;(3) State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China;(4) Research Institute for Bioresources, Okayama University, Chuo 2-20-1, Kurashiki 761-0795, Japan |
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| Abstract: | EDTA-assisted phytoextraction of lead (Pb) has been developed, but concerns have arisen due to the possibility of leaching
of both Pb and EDTA to ground water caused by uncontrolled release. We developed five types of controlled-release EDTA (polymer-coated
EDTA) by coating the EDTA with a polyolefin polymer. A test of the release rate showed that the duration for the release of
75% of total EDTA ranged from 3 to 210 days. A pot experiment was conducted to compare the effect of these polymer-coated
EDTA and non-coated EDTA on the concentrations of Pb and EDTA in soil solution, and Pb accumulation in sorghum (Sorghum bicolor L. cv. EARLY SUMAC) in a Pb-contaminated soil. One of the polymer-coated EDTAs, C-EDTA-4, with a release period of 80 days
proved to be the best in decreasing Pb and EDTA concentrations in soil solution, and increasing Pb accumulation in sorghum
shoots compared to the direct application of EDTA. Our results suggest that polymer-coated EDTA has a potential for phytoextraction
of Pb with a reduced environmental risk. |
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| Keywords: | Coated-EDTA lead (Pb) Phytoremediation Polymer Release Soil contamination Sorghum |
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