机动车限行期间大气颗粒物(TSP、PM10)中二■英（PCDD/Fs）的削减

被引：2

作者：

孙俊玲 ^{[1
]}

王鹏焱 ^{[2
]}

张庆华 ^{[3
]}

机构：

[1] 山东省机动车排气污染监控中心

[2] 海南师范大学

[3] 环境化学与生态毒理学国家重点实验室中国科学院生态环境研究中心

来源：

环境化学 | 2019年 / 38卷 / 07期

关键词：

二■英; TSP; PM10; 交通限行; 北京大气;

D O I：

暂无

中图分类号：

X513 [粒状污染物];

学科分类号：

摘要：

为探讨不同交通状况下大气颗粒物中二■英（PCDD/Fs）的污染特征以及评估交通限行对大气颗粒物中二■英（PCDD/Fs）变化趋势的影响,在中国地质大学（北京）东门使用中流量采样器对大气颗粒物PM10和TSP样品进行了连续同步采集,应用同位素稀释高分辨率气相色谱/高分辨率质谱（HRGC/HRMS）联用法和US EPA 1613B标准方法,检测分析了北京市交通限行期间以及交通限行前后等不同交通状况下大气颗粒物TSP和PM10中17种2,3,7,8-氯取代PCDD/Fs浓度及其变化特征,结果显示,PCDD/Fs在TSP中的浓度和毒性当量（TEQ）分别是交通限行前2117 fg·m-3(120.85 fg I-TEQ·m-3)、限行期间550 fg·m-3(25.26 fg I-TEQ·m-3),在PM10中的浓度（毒性当量）分别是交通限行前2045 fg·m-3(112.87 fg I-TEQ·m-3)、限行期间484 fg·m-3(19.67 fg I-TEQ·m-3)、限行结束后1572 fg·m-3(81.06 fg I-TEQ·m-3). PCDDs浓度远低于PCDFs,体现了典型"热源"特征,除OCDF外,PCDDs和PCDF同族体浓度变化趋势表现为随着取代氯原子个数的增加而增大,PCDD/Fs主要附着在PM10中,占TSP中总浓度的87%—97%,平均92%.交通限行期间PCDD/Fs污染水平明显降低,临时交通流控制措施是PCDD/Fs降低的主要因素.当前的研究结果力求为评价交通源对大气环境中PCDD/Fs的影响以及交通限行对PCDD/Fs的削减贡献提供支撑.

引用

页码：1582 / 1589

页数：8

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