东北沿海城市VOCs的污染特征及气象影响因素分析

从前体物VOCs的体积浓度和臭氧生成潜势、前体物浓度及与臭氧的相关性、气象因素的影响等多方面,研究了东北沿海城市的污染特征,为其污染防治提供管控依据。研究结果表明,VOCs主要组分体积浓度为烷烃>芳香烃>炔烃>烯烃,主要组分对臭氧的贡献为烯烃>烷烃>芳香烃>炔烃;VOCs体积浓度日变化曲线呈“双峰”型,与臭氧呈负相关,秋冬季体积浓度明显高于春夏季;臭氧的浓度与温度和相对湿度呈正相关,与气压和能见度呈负相关;温度、相对湿度等气象因素对VOCs各组分的影响有显著差别。

The pollution characteristics of northeast coastal city were studied from VOCs volume concentration,ozone formation potential(OFP),the correlation between VOCs and ozone and the influence of meteorological factors,etc.,these provide control basis for pollution prevention and control.The results showed that VOCs volume concentration was alkanes>aromatics>alkynes>alkenes and the contribution of VOCs to ozone was alkenes>alkanes>aromatics>alkynes.The diurnal variation curve of VOCs volume concentration showed a bimodal characteristic.The VOC volume concentration and ozone concentration exhibited negative correlation.The VOCs volume concentration in autumn and winter was significantly higher than that in spring and summer.Ozone concentration was positively correlated with temperature and relative humidity,and negatively correlated with air pressure and visibility.Meteorological factors such as temperature and relative humidity had significant differences in the influence of VOCs.