某石油污灌区土壤中BaP和Cd复合污染老化特征研究OA

In this paper,Benzo[a]pyrene(BaP)and Cadmium(Cd)were selected as representative pollutants of Polycyclic Aromatic Hydrocarbons(PAHs)and Heavy Metals(HMs),respectively.The study focused on the soil from a petrochemical wastewater irrigation area in Urumqi.Different surface and profile soils from the sewage irrigation area were aged and cultured in the laboratory for 120 days under three light conditions:shading,sunlight and ultraviolet light.The chemical continuous extraction analysis method was employed to examine the morphological distribution,transformation patterns,and interactions of BaP and Cd before and after aging.This analysis aimed to explore the effects of light conditions on the aging characteristics of BaP and Cd in the soil.The results indicated that the speciation of BaP was associated with the percentage of residual Cd in the soil when both BaP and Cd coexisted.Following light aging,the forms of these two substances in the soil transformed into states that were less accessible to surrounding organisms,thereby reducing their bioavailability.Additionally,ultraviolet light can degrade BaP in the soil and facilitate the transformation of Cd into a residual state.Aging processes can diminish the bioavailability of both BaP and Cd in the soil.The existing forms of BaP and Cd in the soil are influenced by their respective concentrations and the presence of coexisting pollutants.