在线分析宁波市北仑区VOCs组成、趋势及来源

利用VOCs在线监测技术，对2010年宁波市北仑区空气内的VOCs的浓度、组成、变化规律及来源进行分析研究。结果表明，在北仑区域内的16种VOCs中，苯、甲苯、二甲苯、乙苯和己烷的比例占到了总数的82．9％，且该5种有机物浓度存在较为典型的季节性变化规律和日变化规律；采用CMD模型法对VOCs的来源进行解析后发现，北仑区域内的VOCs主要来源于汽车尾气、汽油蒸气和石油液化气，而且汽车尾气的贡献值要比一些大城市低得多，且夏季和冬季的成分源贡献率存在明显差异。

Composition, Tendency and Sources of VOCs in Ambient Air by On-line Monitoring at Ningbo Beilun

The composition,tendency and sources of VOCs were analyzed in ambient air of Beillun by on- line monitoring. The results showed that in the air benzene,toluene,xylene, ethylbenzene and n-hexane were ac- counted for 82.9% of VOCs, and typical seasonal and daily variation were existed for the five pollutants. The chemical mass balance receptor model was applied to estimate the contribution of VOCs source to air pollution. Sources for the receptor were vehicle exhaust, gasoline vapor and liquefied petroleum gas, and the contribution of vehicle exhaust was much lower than some cities. The contribution of sources was different in summer and winter.