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Influence of Nano-Hydroxyapatite on the Metal Bioavailability, Plant Metal Accumulation and Root Exudates of Ryegrass for Phytoremediation in Lead-Polluted Soil

Author

Listed:
  • Ling Ding

    (College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China)

  • Jianbing Li

    (Environmental Engineering Program, University of Northern British Columbia, Prince George, BC V2N4Z9, Canada)

  • Wei Liu

    (College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China)

  • Qingqing Zuo

    (College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China)

  • Shu-xuan Liang

    (College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China)

Abstract

Lead is recognized as one of the most widespread toxic metal contaminants and pervasive environmental health concerns in the environment. In this paper, the effects of nano-hydroxyapatite (NHAP) on remediation in artificially Pb-contaminated soils and ryegrass were studied in a pot experiment. The addition of NHAP decreased the water- and acid-soluble, exchangeable, and reducible fractions of Pb, extracted using the Community Bureau of Reference (BCR) method, whilst greatly increasing the residual fraction of Pb. Oxidizable Pb was increased slightly. No significant increase in soil pH was caused by the application of NHAP. Compared to conditions without NHAP, the addition of NHAP decreased the Pb content in ryegrass shoots and roots by 13.19–20.3% and 2.86–21.1%, respectively. Therefore, the application of NHAP reduced the mobility and bioavailability of Pb in the soil. In addition, the application of NHAP improved the fresh weight of shoots and roots, and promoted the growth of ryegrass. NHAP played a positive role in stimulating ryegrass to secrete tartaric acid.

Suggested Citation

  • Ling Ding & Jianbing Li & Wei Liu & Qingqing Zuo & Shu-xuan Liang, 2017. "Influence of Nano-Hydroxyapatite on the Metal Bioavailability, Plant Metal Accumulation and Root Exudates of Ryegrass for Phytoremediation in Lead-Polluted Soil," IJERPH, MDPI, vol. 14(5), pages 1-9, May.
    • Handle: RePEc:gam:jijerp:v:14:y:2017:i:5:p:532-:d:98735
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    References listed on IDEAS

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    1. Gloria Miller & Gregorio Begonia & Maria Begonia & Jennifer Ntoni, 2008. "Bioavailability and Uptake of Lead by Coffeeweed ( Sesbania exaltata Raf.)," IJERPH, MDPI, vol. 5(5), pages 1-5, December.
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