重庆市代表性城区冬季和夏季苯系物来源解析

2009—2010年冬季和夏季在重庆市某代表性城区对大气中苯系物进行观测,并应用苯与甲苯特征比值(B/T)和因子分析法对苯系物来源进行了分析。结果表明,2种源分析方法具有较好的一致性,涂料及溶剂的生产与使用以及机动车尾气和油品使用是该研究区域苯系物的主要来源,贡献率分别为59.3%和16.2%。不同功能区、不同季节,苯系物来源构成有所差异。除受汽车尾气影响外,夏季受涂料、溶剂等生产使用的影响也较大,尤其是投诉集中点位、混合区和工业区;冬季,投诉集中点位主要受涂料、溶剂等生产使用等影响,其他点位可能还受到燃烧源的影响。

Source Apportionment of BTEX in a Representative District of Chongqing in Summer and Winter

Based on the monitoring data of BTEX in air of a representative district in Chongqing in winter and summer during 2009 to 2010, the B/T value method and factor analysis method were used to analyze the sources of BTEX in the region. The results showed that these two methods were quite consistently and the main source of BTEX in this region were from production and using of paints, solvents and some other subjects and from motor vehicle exhaust and oil use, which contribution rates were 59.3% and 16.2%. In different functional sampling sites, in different season, the sources of BTEX vary. In summer, the production and using of paint, solvents and other products made great contributions to BTEX besides automobile exhaust, especially at complaints focused points, mixing zone and industrial zone. And in winter, the production and using of paint, solvents and other products played important role at the main complaints focused sites while at other sites, the combustion may play important role besides automobile exhaust.