摘要
于2008年7月1～31日在广州城区每天采集PM2.5和PM1.0样品.利用离子色谱分析了样品中Na+、NH4+、K+、Mg2+、Ca2+、F-、Cl-、NO3-和SO24-等9种离子组分质量浓度,并同步收集气象因子、大气散射系数、大气能见度以及SO2、NO2、O3气体污染物质量浓度等数据.结果表明,PM2.5和PM1.0中水溶性无机离子总浓度分别为(25.5±10.9)μg·m-3和(22.7±10.5)μg·m-3,分别占PM2.5和PM1.0质量浓度的(47.9±4.3)%和(49.3±4.3)%.SO42-占PM2.5和PM1.0中质量浓度百分比最高,分别为(25.8±4.0)%和(27.5±4.5)%.较高的温度和O3浓度有利于SO24-的生成,较高相对湿度有利于NO3-的生成.PM2.5和PM1.0中亲水性较强的SO42-、NH4+和NO3-对散射系数和能见度影响较大.
PM2.5 and PM1.0 samples were collected simultaneously during July of 2008 in Guangzhou.The concentrations of watersoluble inorganic ions （Na＋,NH 4＋,K＋,Mg2＋,Ca2＋,F-,Cl-,NO 3-,and SO42-） were determined by ion chromatography.Meteorological parameters,atmospheric scattering,visibility,and concentrations of trace gases （SO2,NO2,and O3） for this period were also recorded.The results showed the total water-soluble inorganic ions concentrations were （25.5±10.9） μg·m-3 and （22.7±10.5） μg·m-3 in PM2.5 and PM1.0,which occupied （47.9±4.3）% and （49.3±4.3）% of PM mass respectively.Sulfate was the most abundant ion and contributed （25.8±4.0）% of PM2.5 mass and （27.5±4.5）% of PM1.0 mass respectively.High temperature and high ozone level favored the formation of sulfate from sulfur dioxide,while the high relative humidity favored the formation of nitrate were observed.Moreover,sulfate,nitrate,and ammonium in PM2.5 and PM1.0 had great impact on the scattering coefficient and visibility degradation.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2010年第7期1417-1424,共8页
Environmental Science
基金
国家环境保护公益性行业科研专项(200809143)
中国科学院知识创新工程领域前沿项目(IAP09320)
关键词
细颗粒物
水溶性无机离子
气体污染物
散射系数
能见度
fine particle
water-soluble inorganic ions
gas pollutants
scattering coefficient
visibility
