摘要
采集2005年1月至12月的大气颗粒物样品，对青岛大气颗粒物中多氯联苯（PCBs）的浓度、组成和时间变化特征进行了研究，结果表明，大气颗粒物中∑7PCBs的含量范围为5．22—8．58pg／m3，月平均值为7．32pg／m3，浓度季节变化不明显。只有PCB28和PCB52两种单体的浓度随温度或气候的变化相对变化较明显，并且大气颗粒物中的PCBs表现出明显的三氯、四氯优势，随着取代氯原子数从3升高至7，同族体比例呈现逐渐降低的趋势。结合PCBs的污染特征进行分析，推断其污染来源除了大气的远距离运移外，主要是存在于本研究区域。
The TSP samples were collected from January to December 2005 in Qingdao. The concentration, composition and temporal variations of PCBs were studied. Concentrations of ∑7PCBs in TSP were in the range of 5.22 - 8.58 pg/m^3 with a month average of 7.32 pg/m3, which did not change notably with the change of seasons. The concentrations of PCB28 and PCB52 changed obviously with the change of temperature or climate. The result showed that lower chlorinated PCBs in TSP are predominated such as tri - PCBs, tetra- PCBs. With the increasing of the number of substitutive Cl from 3 to 7, the proportion of homologs of PCBs decreased gradually. Considering the pollution character of PCBs, the main sources of PCBs in TSP may be the local industries in Qingdao area besides the atmospheric transportation.
出处
《环境保护科学》
CAS
2009年第4期1-4,共4页
Environmental Protection Science
基金
国家自然科学基金项目(40773010)
科技部国际合作重点项目(2006DFA21280)
