Distribution characteristics and ecological risk assessment of polychlorinated biphenyls in farmland soil of Tongliao City
LU Yintao
LIU Mingli
WANG Jing
ZHANG Shichao
YAO Hong
SUN Shaobin
Abstract：In order to investigate the residues of polychlorinated biphenyls (PCBs) in the agricultural soil of sewage irrigation areas,and analyze the effects of different reclaimed wastewater on PCBs in soil,we analyzed 48 types of PCBs congeners of soil samples from 6 irrigation areas of Tongliao City,and assessed the ecological risks by using environmental quality standard and toxicity equivalent factors method.The results showed that the total concentrations of PCBs were between 0.36 ng · g-1 and 2.44 ng · g-1,the total concentrations of seven indicative PCBs ranged from 0.05ng · g 1 to 0.38ng · g-1,and the total concentrations of PCBs in soil from the treated industrial wastewater irrigation areas were the highest.Tri-CBs and tetra-CBs took up the max proportion of the homologues of PCBs,and di-CBs and penta-CBs were in the next place respec tively.It showed a trend that the concentration of PCBs in deep soil samples was lower than that in surface soil samples.Principal component analysis revealed that PCBs in farmland soil was mainly from domestic transformer oil leakage and atmosphere deposition.Overall,the pollution level and toxic equivalence of PCBs in farmland soil of Tongliao City were at a lower level.Risk assessment indicated that the environmental risk in farmland soil of Tongliao City was at a lower level,but the long-term irrigation of wastewater can increase the ecological risk of soil.
Keywords：environmental sciencesoilPCBsreclaimed wastewaterirrigationrisk assessment
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 60-69,61 )