【摘要】 2009年1月-2011年12月在武汉光谷商业区选取G、H两点,采集颗粒物样品,分析了PM10和PM2.5浓度,采用离子色谱测定了灰霾期间PM2.5中4种水溶性阴离子。结果表明:G点PM10和PM2.5年平均浓度分别超过《环境空气质量标准》(GB 3095-2012)二级浓度限值的1.48~1.73倍和1.94~2.4倍,H点分别超标1.16~1.4倍和1.26~1.86倍。灰霾期间PM2.5中主要水溶性阴离子为NO3-、SO42-、NO2-和Cl-,G点4种水溶性阴离子占PM2.5中总水溶性离子的比例分别是为20.29%、10.16%、9.51%和4.62%,H点为14.41%、30.12%、6.64%和3.83%。G点NOx-浓度约为SO42-浓度的3倍,而H点SO42-浓度约为NOx-浓度的1.5倍。G与H点NOx-和SO42-离子浓度的差异暗示两监测点的主要污染源不同,交通量和植被覆盖率可能是导致两点浓度差异的原因。。更多还原

【Abstract】 PM10 and PM2.5 samples were collected from January 2009 to December 2011 at two sites(site G and site H) in business area of Optics Valley,Wuhan.Mass concentration of PM10 & PM2.5 was analyzed.Four kinds of water-soluble anions of PM2.5 in haze days were determined by ion chromatography.The results showed that the annual average concentration of PM10 and PM2.5 at site G exceeded 1.48 to 1.73 times and 1.94 to 2.4 times,respectively,compared with limit value of Class Ⅱ(GB3095-2012).While the concentration at site H exceeded 1.16 to 1.4 times and 1.26 to 1.86 times,respectively.NO3-、 SO42-、NO2-and Cl-were the major water-soluble anions in particulate matter during haze days.The ratio of 4 water-soluble anions in total water-soluble anions in PM2.5at site G was 20.29%,10.16%,9.51% and 4.62%,respectively.While it was 14.41%,30.12%,6.64% and 3.83% at site H.The concentration of NOx-was approximate three times of SO42-at site G,while the concentration of SO42-was about 1.5 times of NOx-at site H.The discrepancy between the two ions indicated that the main pollution sources of the two sampling sites were different,and the traffic volume and vegetation coverage may be the reasons of concentration difference.更多还原