Yue Li, Junqiang Ma, Yu Wang, Sunan Xu, Lei Jiang, Zhonglin Chen

School of Environment

Abstract

The lead (Pb) and benzo[a]pyrene (B[a]P) absorption and transfer characteristics of ryegrass under the Pb-B[a]P combined pollution and their influences on mineral absorption were investigated through a laboratory pot-culture experiment. Results demonstrate that Pb-B[a]P combined pollution increase Pb and B[a]P contents in ryegrass significantly. Low contaminated concentration of Pb (<100mg·kg^-1) and B[a]P are easy to accumulate in  root system of ryegrass, while only few Pb and B[a]P migrate to shoots. When the Pb contaminated concentration is 100 mg·kg^-1 and B[a]P contaminated concentration is 30 mg·kg^-1, the bioconcentration factor (BCF) and transfer coefficient (TC) of both shoots and roots of ryegrass are higher than those under other concentrations, indicating that ryegrass achieves stronger remediation effect to low-concentration Pb (100mg·kg^-1) and B[a]P (30mg·kg^-1) combined pollution. Pb-B[a]P combined stress hinders mineral absorption of ryegrass. With the increase of Pb and B[a]P contaminated concentrations, N, P, K, Mg and Fe contents in ryegrass are decreased dramatically. The root system of ryegrass is the main absorption and bioconcentration organ of N, P, K and Fe. Pb-B[a]P combined pollution is negatively correlated with N, K, Mg and Fe contents in roots and shoots.

Read the article here:   40-EFFECT OF COMBINED POLLUTION OF LEAD AND BENZO[A]PYRENE ON ABSORPTION OF LEAD BENZO[A]PYRENE AND MINERAL ELEMENTS IN RYEGRASS.pdf