北京交通大学学报2017，Vol.41Issue(4)：60-69,61,11.DOI:10.11860/j.issn.1673-0291.2017.04.008
通辽地区农田土壤中多氯联苯分布特征及生态风险评价
Distribution characteristics and ecological risk assessment of polychlorinated biphenyls in farmland soil of Tongliao City
摘要
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.关键词
环境科学/土壤/多氯联苯/再生水/灌溉/土壤/生态风险Key words
environmental science/soil/PCBs/reclaimed wastewater/irrigation/risk assessment分类
资源环境引用本文复制引用
鲁垠涛,刘明丽,王静,张士超,姚宏,孙绍斌..通辽地区农田土壤中多氯联苯分布特征及生态风险评价[J].北京交通大学学报,2017,41(4):60-69,61,11.基金项目
国家水专项(2014ZX07202-011) （2014ZX07202-011）
内蒙古科技厅引导基金(20090148)National Water Project(2014ZX07202-011) （20090148）
Inner Mongalia Science and Technology Foundation(20090148) （20090148）
