广州市大气气溶胶中水溶性有机物的季节变化

采用BSTFA 衍生化预处理和GC/MS 分析技术, 于2002─2003年对广州市荔湾区大气气溶胶中的水溶性化合物进行了定量检测.结果表明，水溶性化合物呈现一定的季节变化趋势.脱水糖类在春、夏、秋、冬的质量浓度分别为132.06，160.58，301.70和244.90 ng/m3，左旋葡聚糖的秋季质量浓度达到234.9 ng/m3，表明存在大量的生物质燃烧；以葡萄糖、蔗糖为代表的糖类化合物主要来源于生长在土壤中的植物，其进入气溶胶中的主要途径是农作物的耕作和收割、风的侵蚀以及交通等，秋季质量浓度较高可能与植物落叶和秸秆燃烧有关；二酸的质量浓度在冬季达到最大值，可能与广州的气象条件有关.广州夏季盛行西南风，降雨较多，而冬季通常逆温少雨，造成二酸质量浓度升高. 

Seasonal Variation of Water-Soluble Organic Compounds in Aerosols of Guangzhou, China

Total suspended particles(TSP),collected from 2002 to 2003 in Guangzhou,were analyzed for the water-soluble organic compounds(WSOCs) compositions using gas chromatography-mass spectrometry(GC/MS).The results showed that WSOCs exhibited the distinct seasonal variation.The mass concentration of anhydrosaccharides was 132.06,160.58,301.70 and 244.90(ng/m~3) in the spring, summer,autumn and winter,respectively.Also the concentration of levoglucosan reached 234.9 ng/m~3 in the autumn,which indicated that there might be plenty of biomass combustion.The saccharides,such as glucose and sucrose,mostly came from the plants lived in the soil,which went into the aerosol through crop culture and harvesting,the wind erosion,the traffic and so on.The higher concentration in the autumn may be caused by the combustion of plant leaves and straws.Additionally,the highest concentration of dicarboxylic acids was observed in the winter,which may be related to the meteorological condition of Guangzhou.The southwester prevailed in Guangzhou in the summer with more rain fall,but inversion temperature and less rain in the winter,which resulted in the increase of the mass concentration of dicarboxylic acids.