Phytoremediation for co-contaminated soils of chromium and benzo[a]pyrene using Zea mays L.

摘要

A greenhouse experiment was carried out to investigate the single effect of benzo[a]pyrene (B[a]P) or chromium (Cr) and the joint effect of Cr-B[a]P on the growth of Zea mays, its uptake and accumulation of Cr, and the dissipation of B[a]P over 60 days. Results showed that single or joint contamination of Cr and B[a]P did not affect the plant growth relative to control treatments. However, the occurrence of B[a]P had an enhancing effect on the accumulation and translocation of Cr. The accumulation of Cr in shoot of plant significantly increased by>79 % in 50 mg kg~(-1) Cr-B[a]P (1, 5, and 10 mg kg~(-1)) treatments and by≥86 % in 100 mg kg~(-1) Cr-B[a]P (1, 5, and 10 mg kg~(-1)) treatments relative to control treatments. The presence of plants did not enhance the dissipation of B[a]P in lower (land 5 mg kg~(-1)) B[a]P contaminated soils; however, over 60 days of planting Z mays seemed to enhance the dissipation of B[a]P by over 60 % in 10 mg kg~(-1) single contaminated soil and by 28 to 41 % in 10 mg kg~(-1)B[a]P co-contaminated soil. This suggests that Z mays might be a useful plant for the remediation of Cr-B[a]P co-contaminated soil.