Magnetic field enhance decontamination efficiency of Noccaea caerulescens and reduce leaching of non-hyperaccumulated metals

•Pb and Cu were mobilized but not hyperaccumulated by Noccaea caerulescens.•More Pb and Zn leached from pots with N. caerulescens than with Thlaspi arvense.•Magnetic field with intensity below 150 mT promoted the growth of N. caerulescens.•Magnetic field decreased the volume of leachate.•Less Pb and...

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Bibliographic Details
Published in:Journal of hazardous materials 2019-04, Vol.368, p.141-148
Main Authors: Luo, Jie, He, Wenxiang, Yang, Dan, Wu, Jian, Sophie. Gu, X.W.
Format: Article
Language:English
Subjects:
Heavy metal
Hyperaccumulator
Leaching risk
Magnetic field
Phytoremediation
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Summary:•Pb and Cu were mobilized but not hyperaccumulated by Noccaea caerulescens.•More Pb and Zn leached from pots with N. caerulescens than with Thlaspi arvense.•Magnetic field with intensity below 150 mT promoted the growth of N. caerulescens.•Magnetic field decreased the volume of leachate.•Less Pb and Zn leached from pots treated by magnetic field. Hyperaccumulators can accumulate high amounts of specific metals and have been widely used to remediate metal polluted soil. However, organic acid secretion and soil acidification (two important mechanisms for hyperaccumulators to mobilize and extract metals) can also activate non-hyperaccumulated metals and then increase the leaching risk. The decontamination efficiency and leaching risk of using Noccaea caerulescens (formerly Thlaspi caerulescens) and Thlaspi arvense were compared in the present study. Although N. caerulescens accumulated significantly more Cd and Zn than T. arvense, it increased the leaching risk of Pb and Cu as well. Under magnetic fields of 30, 60, 120 and 150 mT, the biomass production of N. caerulescens was increased by 18.5, 48.9, 80.4, and 29.3% respectively, but decreased by 21.7% under 400 mT. Comparing with the control, plants raised from seeds pre-treated by magnetic fields accumulated 37.8–250.1% more metals and reduced the leachate volume and leached metals by 1.1–32.9% and 4.6–48.1% respectively. Considering remediation efficiency, environmental risk alleviation and energy consumption, N. caerulescens treated by 120 mT magnetic field is suited to remediate multi-metal polluted soil.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2019.01.046