摘要
多介质模型是研究有机污染物在城市环境中行为的主要模型.本文运用三级逸度模型(四相环境介质:大气、水、土壤、沉积物)和城市多介质归趋模型(六相环境介质:大气、水、土壤、沉积物、植物、不透水层)模拟研究了成都市7种典型有机磷酸酯阻燃剂(磷酸三丁酯(Tn BP)、磷酸三异辛酯(TEHP)、磷酸三丁氧乙酯(TBEP)、磷酸三苯酯(TPhP)、磷酸三氯乙酯(TCEP)、磷酸三氯丙酯(TCPP)、磷酸三(2,3-二氯丙基)酯(TDCPP))在环境中的分布和归趋行为,用实测数据对模型进行验证,并进行了参数灵敏度及模型不确定性分析.通过与文献提供的监测数据对比发现,模拟预测浓度与实测浓度基本在1个数量级范围内,符合计算精度.四相环境介质的三级逸度模型中OPEs的模拟结果表明,土壤和沉积物是OPEs的主要归趋,其中,土壤中富集了93.34%的OPEs,沉积物中富集了6.63%的OPEs.而六相环境介质的城市多介质归趋模型(MUM)模拟结果表明,达到平衡时,不透水层中∑7OPEs的浓度为1.01×10~3mol·m^(-3),是大气相浓度的2.42×10~9倍;植物相中OPEs达到2.38mol·m^(-3),是大气相浓度的1.61×10~7倍,说明城市中不透水层及植物相对OPEs的污染归趋有重要影响.
Multimedia model is widely considered as the mainstream model in investigating transport and fate of organic pollutants in the urban environment. In this paper, a level Ⅲ multimedia fate model （ air, water, soil and sediment） and a multimedia urban model （ air, water, soil, sediment, vegetation, and organic film that coats the impervious surfaces） were applied to study the distribution and fate behavior of the seven typical kinds of organic phosphorus esters （OPEs） in Chengdu city, including tri-n-butyl phosphate （TnBP） , tris （2-ethylhexyl） phosphate （ TEHP ） , tributoxyethyl phosphate （ TBEP）, triphenyl phosphate （ TPhP ）, tri （ 2-chloroethyl ） phosphate （ TCEP ）, trichloropropyl phosphate （ TCPP ） and tridiehloropropyl phosphate （TDCPP）. Meanwhile, the model was verified by comparing with the actual monitoring data, and sensitivity analysis and uncertainty analysis were conducted. Compared with the monitoring data provided by the literature, the difference between the modelled and measured levels of OPEs was generally within a logarithmic unit, thus in line with the simulation requirements. The simulation results based on the four media showed that soil and sediment were the most important sinks for OPEs, which accounted for 93.34% and 6.63% of total OPEs, respectively. In addition, the results based on the six media showed that the mean value of the total OPEs （∑7OPEs） concentration in impervious surface was 1.01 × 103 mol. m-3 at equilibrium, which was 2.42× 109 times that in the air. The modelled mean level of the 5-70PEs concentration in the vegetation was 2.38 mol· m-3 , which was 1.61×107 times that in the air. The results of these data suggested that the impervious surface and the vegetation played an important role in the fate of OPEs in Chengdu city.
出处
《环境科学学报》
CAS
CSCD
北大核心
2017年第9期3489-3497,共9页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.41773072
21407014)
四川省科技支撑计划项目(No.2015GZ0240)
成都信息工程大学大气环境模拟与污染控制重点实验室开放课题(No.KFKT2016001)
成都信息工程大学中青年学术带头人科研基金(No.J201415)~~
关键词
OPEs
多介质归趋模型
城市
迁移
逸度
OPEs
the multimedia environmental fate model
city
transfer
fugacity
