文摘
Polycyclic aromatic hydrocarbons (PAHs) and potentially toxic elements (PTEs) were monitored over 56 days in calcareous contaminated-soil amended with either or both biochar and Eisenia fetida. Biochar reduced total (449 to 306 mg kgp>−1p>) and bioavailable (cyclodextrin extractable) (276 to 182 mg kgp>−1p>) PAHs, PAH concentrations in E. fetida (up to 45 % ) but also earthworm weight. Earthworms increased PAH bioavailability by >40 % . Combined treatment results were similar to the biochar-only treatment. Earthworms increased water soluble Co (3.4 to 29.2 mg kgp>−1p>), Cu (60.0 to 120.1 mg kgp>−1p>) and Ni (31.7 to 83.0 mg kgp>−1p>) but not As, Cd, Pb or Zn; biochar reduced water soluble Cu (60 to 37 mg kgp>−1p>). Combined treatment results were similar to the biochar-only treatment but gave a greater reduction in As and Cd mobility. Biochar has contaminated land remediation potential, but its long-term impact on contaminants and soil biota needs to be assessed.