摘要
对西安市2011年的降水及PM2.5进行采样,并对其进行了pH及无机水溶性离子测定。结果表明,西安市酸雨的污染类型以硫酸型污染为主,连续性降水对大气颗粒物的去除效果明显,pH随降水量的增加而减小。对采样日降水前和降水后3 h的PM2.5监测结果表明降水对PM2.5质量浓度与其中的离子有一定去除作用。西安市的PM2.5呈酸性,并且与降水的pH有着很好的相关性;另外降水前PM2.5的质量浓度、SO2-4浓度与降水pH呈负相关,NO-3与降水pH的相关性不明显。近几年PM2.5和降水中的SO2-4/NO-3当量值变化趋势表明西安市大气污染已步入煤烟和机动车尾气混合型污染类型,且机动车污染对大气污染和酸雨的贡献比例有所增加。
According to the monitored data of rainfall and PM2.5 in Xi＇an,The effect of persistent precipitation on the removal of atmospheric particulate matter is obvious.pH decreases with the add amount of precipitation.The precipitation can also remove the qualitative concentration of PM2.5 and the ion on PM2.5.PM2.5 in Xi＇an is acidic,and there is a obvious relationship between precipitation and PM2.5.There is also a evident relationship between the qualitative concentration of PM2.5 、SO42-and pH of precipitation.The relationship between the concentration of NO3-and pH of precipitation is not obvious.
出处
《中国环境监测》
CAS
CSCD
北大核心
2013年第6期22-28,共7页
Environmental Monitoring in China
基金
陕西省自然科学基金资助项目(2007D20)
陕西省教育厅专项科研基金资助项目(06JK268)
