Abstract:
Biochar has shown great potential for immobilizing organic contaminants in soil. In this
study, pentachlorobenzene (PeCB), 1, 2, 4, 5-tetrachlorobenzene (1, 2, 4, 5-TeCB), and 1, 2,
4-trichlorobenzene (1, 2, 4-TCB) artificially spiked soil was amended with wheat straw
biochar at 0.1%, 0.5%, 1%, and 2% application rates, respectively. The sorption, dissipation,
and bioavailability of chlorobenzenes (CBs) in soil were investigated. The sorption of PeCB
by biochar was significantly higher than that of its sorption by both biochar-amended and
unamended soil (p< 0.05). The dissipation and volatilization of CBs from biochar-amended
soil significantly decreased relative to unamended soil (p< 0.05). Bioavailability of CBs,
expressed as butanol extraction efficiency and earthworm (Eisenia fetida) bioaccumulation
factor, significantly decreased with increasing aging time and biochar application rate …