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Phytoremediation of Pb contaminated soil with polymer-coated EDTA

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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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Acknowledgements

This study was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan (No. 13556010 to J. F. Ma) and by CAS International Partnership Project (CXTD-Z2005-4). We thank Fangjie Zhao for his critical reading of this manuscript.

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Authors and Affiliations

  1. Fertilizer Plant, Asahi Kasei Chemicals Corporation, Samejima 2-1, Fuji-shi, Shizuoka, 416-8501, Japan

    Masaru Shibata & Ryo Akaike

  2. Faculty of Agriculture, Kagawa University, Ikenobe 2393, Miki-cho, Kita-gun, Kagawa, 761-0795, Japan

    Takayuki Konno & Yong Xu

  3. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China

    Renfang Shen

  4. Research Institute for Bioresources, Okayama University, Chuo 2-20-1, Kurashiki, 761-0795, Japan

    Jian Feng Ma

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  1. Masaru Shibata
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  2. Takayuki Konno
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  3. Ryo Akaike
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  4. Yong Xu
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  5. Renfang Shen
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  6. Jian Feng Ma
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Correspondence to Jian Feng Ma.

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Shibata, M., Konno, T., Akaike, R. et al. Phytoremediation of Pb contaminated soil with polymer-coated EDTA. Plant Soil 290, 201–208 (2007). https://doi.org/10.1007/s11104-006-9152-x

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  • DOI: https://doi.org/10.1007/s11104-006-9152-x

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