无锡市大气中类二噁英多氯联苯污染水平  

Level of Dioxin-like Polychlorinated Biphenyls in Atmosphere of Wuxi

作　　者：王英[1] 何松洁[1] 金军[1] 李明圆[1] 马召辉[1] 亓学奎[1] 

机构地区：[1]中央民族大学生命与环境科学学院,北京100081

出　　处：《环境科学与技术》2013年第4期44-48,83,共6页Environmental Science & Technology

基　　金：高等学校学科创新引智计划项目(B08044);中央民族大学985项目(CUN985-3-3)

摘　　要：为了了解无锡市大气中类二噁英多氯联苯(Dioxin-like PCBs,DL-PCBs)水平,利用大流量空气采样器在无锡市分别采集了6个气相和6个颗粒相大气样品,气相色谱-质谱(GC-NCI-MS)测定样品中12种类二噁英多氯联苯。结果显示,大气样品中∑_(12)DL-PCBs的总浓度(气相+颗粒相)为1157～2 747 fg/m^3,平均浓度为1759 fg/m^3。其中,气相的浓度为11 124～2 721 fg/m^3,平均值为1 701fg/m^3;颗粒相的浓度为26～143 fg/m^3,平均值为58fg/m^3。气相中∑_(12)DL-PCB含量占总量的97%,而颗粒相仅占3%。DL-PCBs的总毒性当量(气相+颗粒相)为2.16～4.47fg TEQ/m^3,平均值为3.53fg TEQ/m^3。DL-PCBs单体中PCB-118的浓度最高,平均占总浓度的54%,其次是PCB-105和PCB-77,PCB+81在所有样品中均未检出。在所有DL-PCBs中,毒性当量浓度的主要贡献者为PCB-126,其平均贡献率为95%,其次为PCB-169,平均贡献率为3%。To assess dioxin-like polychlorinated biphenyls （DL-PCBs） concentration in the atmosphere of Wuxi, Jiangsu Province,6 gas phase and 6 particle phase samples were collected with a modified high volume sampler, and then the 12 DL-PCBs were detected by gas chromatography-negative chemical ionization-mass spectrometry （GC-NCI-MS）. Results indicated that total concentrations of DL-PCBs in air samples （gas phase＋particle phase） ranged from 1 157 fg/m3 to 2 747 fg/m3 with a mean of 1 759 fg/m3, in which concentrations of DL-PCBs in gas phase samples were 1 124 fg/m3 to 2 721 fg/m3, with a mean concentration of i 701 fg/m3, accounting for 97% of total DL-PCBs （gas phase ＋particle phase）. The concentrations of DL-PCBs in particle phase samples were 26 fg/m3 to 143fg/m3, accounting for 3% of total DL-PCBs（gas phase＋particle phase）. Total average toxicity equivalent（TEQ） concentration of DL-PCBs in air samples（gas phase＋particle phase） was 3.53 fg TEQ/m3 （2.16-4.47 fg TEQ/m3）. PCB-/18 had the highest concentration among DL-PCBs, accounting for 54% of total concentration, followed by PCB-105 and PCB-77, PCB-81 was not detected in all of the samples. PCB- 126 was the dominant contributor to TEQ, accounting for 95%, followed by PCB-169 accounting for 3%.

关 键 词：大气 类二噁英多氯联苯 水平 气-粒分配 同族体分布 

分 类 号：X51[环境科学与工程—环境工程]