摘要
根据南京市郊区雾的外场实验观测资料及采集的雾水样品分析,探讨南京市郊区雾水中Hg和雾天大气污染特征.郊区出现雾天时,不利于大气污染物的扩散,造成PM10,CO和总烃浓度先增加后降低,污染物浓度的变化与雾的生消基本同步;雾消散后SO2,PM10和NOx的浓度比雾前高2.5—10倍.雾水中汞浓度在2.956—7.205μg.l-1范围内,平均为5.471μg.l-1,浓度高值出现在雾的维持阶段;对Hg与大气污染物之间的关系作相关分析,其中汞与大气中CO的相关系数为0.939,说明其具有同源性.
In this study,deposition fluxes of mercury due to fog have been calculated during December 2006 at Nanjing suburban.Systematic monitoring of atmospheric pollution on fog day have been conducted.Experiment results showed that air pollution diffused badly in fog days.The concentrations of PM10,CO and total hydrocarbon were lower after increasing first synchronized with fog formation and disappearance.The concentration of air pollution was 2.5 to 10 fold higher than fog appearance.The concentration of mercury in fog water was 2.956—7.205 μg·l^-1 and average value was 5.471μg·l^-1,the highest value falls on the maintenance stage of fog.The highly significant correlation with 0.939 between concentration of CO and mercury indicates that they have same sources.It is speculated that high concentration of mercury in fog water was caused by the integration of long-distance transport and scavenging of local pollutants.
出处
《环境化学》
CAS
CSCD
北大核心
2008年第1期105-109,共5页
Environmental Chemistry
基金
江苏省气象灾害重点实验项目(KLME060208)
江苏省教育厅自然科学基础研究重大项目(06KJA17021)
江苏省自然科学基金项目(BK2007226)
国家自然科学基金项目(40775012)
关键词
雾水
汞
大气污染
南京市
fog water,mercury,air pollution,Nanjing.
