Effects of biochar and the earthworm Eisenia fetida on the bioavailability of polycyclic aromatic hydrocarbons and potentially toxic elements

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• 作者：Jose L. Gomez-Eyles ; Tom Sizmur ; Chris D. Collins ; Mark E. Hodson
• 关键词：PAH ; PTE ; Soil ; Contamination ; Remediation
• 刊名：Environmental Pollution
• 出版年：2011
• 出版时间：February 2011
• 年：2011
• 卷：159
• 期：2
• 页码：616-622
• 全文大小：343 K

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 kg⁻¹) and bioavailable (cyclodextrin extractable) (276 to 182 mg kg⁻¹) PAHs, PAH concentrations in E. fetida (up to 45 % ) but also earthworm weight. Earthworms increased PAH bioavailability by e;40 % . Combined treatment results were similar to the biochar-only treatment. Earthworms increased water soluble Co (3.4 to 29.2 mg kg⁻¹), Cu (60.0 to 120.1 mg kg⁻¹) and Ni (31.7 to 83.0 mg kg⁻¹) but not As, Cd, Pb or Zn; biochar reduced water soluble Cu (60 to 37 mg kg⁻¹). 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.