徐州市城市大气中的PAHs来源解析

采用化学质量平衡模型（CMB）对徐州市大气颗粒物中的多环芳烃（PAHs）进行来源分析，从而来确定各个源对大气的PAHs贡献值。主要通过利用大流量采样器配置PM10切割头在冬季和夏季对不同功能区，即生活区、工业区和旅游区采样大气中的可吸入颗粒物（PM10）样品，并用高效液相色谱法（HPLC）重点分析和研究了美国环保局（EPA）列出的16种PHAS优先污染物。研究结果表明：徐州市PM10污染比较严重，PM10污染质量浓度水平冬季是（288.81μg·m-3）大于夏季（276.34μg·m-3），特别是工业区，污染数值达到393.13μg·m-3。夏季的总PAHs质量浓度为22.89 ng·m-3，分别是生活区28.35 ng·m-3、工业区21.75 ng·m-3和旅游区18.58 ng·m-3。冬季的总PAHs质量浓度为306.29 ng·m-3，分别是工业区388.03 ng·m-3、生活区276.29 ng·m-3和旅游区254.28 ng·m-3。夏季和冬季情况下，旅游区的污染相对来说都是最低的PM10中多环芳烃的源解析结果为，煤烟尘污染源的全年贡献率为64.00%，冬季煤烟尘污染源的贡献率为66.51%，夏季煤烟尘污染源的贡献率为57.21%，说明煤烟尘是PM10中多环芳烃的主要贡献源，土壤尘次之，全年贡献率为24.90%，冬季为25.48%，夏季为28.97%，因此，扬尘和烟煤尘的污染是徐州市的PM10中PAHs的最主要来源。

Source apportionment of polycyclic aromatic hydrocarbon in Xuzhou

CMB receptor model was used to calculate the source apportionment of PAHs in the particulate matter （PM）, and to determine the contribution value of different sources. We used the high-volume air sampler to collect the winter and summer PM10 samples from three districts-living area, industry area and tourism area, and also used HPLC method to analysis the 16 kinds of PAHs. The results show that the PM10 pollution of Xuzhou is serious and the concentration is 288.81μg·m-3 in winter and 276.34μg·m-3, especially in the industry area, the concentration is 393.13μg·m-3. The concentration of total PAHs in winter （306.29 ng·m-3） is almost 15 times than the concentration in summer （22.89 ng·m-3）. According to the CMB model, coal combustion contributed 64%of total PAHs, 66.51%in winter and 57.21%in summer, which means the coal combustion is the most important source in Xuzhou, the second source is soil dust, which account for 24.90%. Results of source apportionment show that dust and coal burnning are the major sources of PAHs in PM10.