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Using sequential extraction and DGT techniques to assess the efficacy of plant- and manure-derived hydrochar and pyrochar for alleviating the bioavailability of Cd in soils.

Authors
  • Han, Lanfang1
  • Zhao, Xingjuan1
  • Jin, Jie1
  • Gao, Bo2
  • Yang, Yan1
  • Sun, Ke3
  • Li, Fangbai4
  • 1 State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China. , (China)
  • 2 State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China. , (China)
  • 3 State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China. Electronic address: [email protected] , (China)
  • 4 Guangdong Public Laboratory of Environmental Science and Technology, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, China. , (China)
Type
Published Article
Journal
The Science of the total environment
Publication Date
Aug 15, 2019
Volume
678
Pages
543–550
Identifiers
DOI: 10.1016/j.scitotenv.2019.05.039
PMID: 31078844
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Biochar has emerged as a useful tool to reduce the bioavailability of heavy metals in contaminated soils. However, limited research has been directed towards determining the effects of pyrolysis conditions and feedstock types of biochar on the bioavailability of heavy metals in biochar-treated soils. This work evaluated the efficacy of plant- and manure-derived hydrochar and pyrochar for alleviating Cd bioavailability in soils using conventional chemical extraction, diffusive gradients in thin films (DGT) and plant uptake. For each feedstock type, hydrochar showed lower maximum adsorption capacity than pyrochar. As determined by diethylenetriamine pentaacetic acid, BCR extraction and DGT measurement, pyrochar significantly decreased the theoretical bioavailability of Cd. Moreover, a slight decrease in the ability of soil to resupply Cd to the solution was detected. Also, pyrochar induced a substantial reduction in Cd uptake in ryegrass. Corresponding to the high sorption capacity, swine solid-derived 450 °C pyrochar was the most effective in alleviating Cd bioavailability in soils, indicating its great potential for remediating Cd-contaminated soils. Additionally, the bioavailable Cd amount determined by DGT had the best correlation with the Cd content in ryegrass, showing that DGT technology could better represent the effects of biochars on Cd phytoavailability in the studied soil. Copyright © 2019 Elsevier B.V. All rights reserved.

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