Assessing simultaneous immobilization of lead and improvement of phosphorus availability through application of phosphorus-rich biochar in a contaminated soil: A pot experiment

Hanbo Chen, Ying Feng, Xing Yang, Bingshuang Yang, Binoy Sarkar, Nanthi Bolan, Jun Meng, Fengchang Wu, Jonathan W. C. WONG, Wenfu Chen, Hailong Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Soil lead (Pb) contamination is often caused by anthropogenic activities. In this study, a pot experiment was conducted to assess the effect of biochars derived from pig-carcass (PCBC) and branches of oriental-plane tree (OPBC) on the bioavailability, redistribution, and phytoavailability of Pb and P, as well as the growth of Ipomoea aquatica Forsk in a Pb-contaminated soil. Application of PCBC increased the total and available P concentrations in the soil as compared to the control, and enhanced the concentrations of labile P and sparingly labile P via direct exogenous P input and improvement of soil pH. Both biochars facilitated P accumulation in plant shoots and roots. Sequential extraction of soil Pb confirmed that biochar application facilitated the transformation of mobile Pb into stable fractions, with greater effects from PCBC than OPBC. Hence, biochar application significantly decreased the soil DTPA-extractable Pb by 90.2% (PCBC) and 64.0% (OPBC) compared to the control, consequently reducing Pb uptake by plants. The Pb immobilization by biochar was driven by the biochar-induced increase of soil pH, Pb-phosphate/carbonate precipitation, ion exchange between Pb2+ and biochar-derived cations (e.g., Ca2+ and K+), and surface complexation with functional groups (e.g., carboxyl, hydroxyl, C[dbnd]O). Application of PCBC simultaneously increased the biomass of plant roots and shoots, by 1.8- and 0.6- folds, respectively. Overall, PCBC showed a potential to function as an effective amendment in the immobilization of Pb and alternative P fertilizer to improve degraded soils.

Original languageEnglish
Article number133891
JournalChemosphere
Volume296
Early online date5 Feb 2022
DOIs
Publication statusE-pub ahead of print - 5 Feb 2022

Scopus Subject Areas

  • Public Health, Environmental and Occupational Health
  • Pollution
  • Chemistry(all)
  • Health, Toxicology and Mutagenesis
  • Environmental Engineering
  • Environmental Chemistry

User-Defined Keywords

  • Alternative fertilizer
  • Bioavailability
  • Heavy metal
  • Sequential extraction
  • Soil remediation

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