In situ remediation and phytotoxicity assessment of lead-contaminated soil by biochar-supported nHAP

Zhangmei YANG, Zhanqiang FANG, Po Keung Eric TSANG, Jianzhang FANG, Dongye ZHAO

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Abstract

In this study, a kind of biochar-supported nano-hydroxyapatite (nHAP@BC) material was used in in-situ remediation of lead-contaminated soil. Column experiments were performed to compare the mobility of nHAP@BC and Bare-nHAP. The immobilization, accumulation and toxic effects of Pb in the after-amended soil were assessed by the in vitro toxicity tests and pot experiments. The column experiments showed a significant improvement in the mobility of nHAP@BC. The immobilization rate of Pb in the soil was 74.8% after nHAP@BC remediation. Sequential extraction procedures revealed that the residual fraction of Pb increased by 66.6% after nHAP@BC remediation, which greatly reduced the bioavailability of Pb in the soil. In addition, pot experiments indicated that nHAP@BC could effectively reduce the upward translocation capacity of Pb in a soil-plant system. The concentration of Pb in the aerial part of the cabbage mustard was 0.1 mg/kg, which is lower than the tolerance limit (0.3 mg/kg). nHAP@BC can remediate Pb-contaminated soil effectively, which can restore soil quality for planting. Copyright © 2016 Elsevier Ltd.
Original languageEnglish
Pages (from-to)247-251
JournalJournal of Environmental Management
Volume182
Early online dateJul 2016
DOIs
Publication statusPublished - Nov 2016

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phytotoxicity
Remediation
remediation
Lead
Soils
immobilization
soil
experiment
toxicity test
soil quality
translocation
bioavailability
Experiments
tolerance
in situ
contaminated soil
Hydroxyapatite
Toxicity
Antennas

Bibliographical note

Yang, Z., Fang, Z., Tsang, P. E., Fang, J., & Zhao, D. (2016). In situ remediation and phytotoxicity assessment of lead-contaminated soil by biochar-supported nHAP. Journal of Environmental Management, 182, 247-251.

Keywords

  • Lead-contaminated soil
  • In-situ remediation
  • nHAP@BC
  • Mobility
  • Phytotoxicity