衡山大气中PCBs的浓度水平及来源分析

为研究我国高山地区大气中多氯联苯(PCBs)的含量情况,于2009年4月~5月在衡山气象站采集了气相及颗粒相样品.以气相色谱法测得该地区大气中7种指示性PCB(Indicator-PCBs)的平均浓度为180.51pg/m3,含量最多的为PCB52.与国外高山站点相比,衡山的PCBs含量处于较高水平.通过后推气流轨迹分析了气流来向对PCBs含量的影响,结果显示,来自北方的气流携带较多的PCBs.主因子分析的结果表明,该地区PCBs的来源可以归结为3类,分别为:国外的PCBs产品;焚烧炉排放、造纸漂白等工业生产过程以及国产的变压器油等PCBs产品;含PCBs的油漆添加剂等.

Concentration levels and sources of polychlorinated biphenyl in Mount Heng,China

During April and May, 2009, gas and particulate phase samples were obtained at Mount Heng to evaluate the levels of PCB concentrations in the atmosphere of that region. The mean value of the 7 indicator-PCBs detected by GC was 180.51 pg/m3,while the dominate PCB congener was PCB52. The concentration of PCBs at Mount Heng was at a high level compared with high-mountain sites overseas. Back trajectory analysis was conducted to classify PCB concentrations influenced by different air directions. Airflows coming from North China carried more pollutants. The outcome of principal component analysis showed that the sources of PCBs in this region could be divided into three main parts: one represents PCB products made in foreign countries, another includes the release of incinerators , industrial processes such as paper bleaching and oils used in transformers or others which were made in China , and the last are paint additives containing PCBs.