重庆主城区PM 2.5中金属元素组分特征分析

利用Xact-625大气多金属在线监测仪监测重庆市2013年春季PM2.5中金属元素的含量,分析PM2.5及金属元素的浓度分布特征与时间变化规律;结果发现,春季PM2.5质量浓度变化范围为15.6～157.3 μg·m-3,15种金属元素平均总浓度为2 481 ng·m-3,占PM2.5总浓度的3.86％;典型日分析中,Zn、Pb的浓度从5点钟开始持续升高,在10点钟达到峰值;As浓度在1点钟出现最小值;富集因子法分析结果表明Zn、As、Se、Ag、Cd、Sn、Hg、Pb的富集因子较大,为人为污染.

Analysis of the Features of Metal Elements in PM2.5 of Chongqing Main Districts

Xact-625 automatic multi-metal online monitor was used to monitor the contents of metal elements in PM2.5 in Spring in Chongqing in 2013 to analyze the concentration distribution feature and change law with timeof PM2.5 and the metal elements, and the results show that PM2.5 mass concentration change range in Spring was 15.6- 157.3 ug/m3, that the average total concentration of 15 metal elements was 2481 ng/m3 which accounted for 3.86 percent of PM25 total concentration, that in typical day analysis, the total concentration of Zn and Pb started to rise since 5 o＇clock and reached the peak at 10 o＇clock, and that the concentration of As amounted to the minimum value at 1 o＇clock. Enrichment factor method analysis result showed that the enrichment factor of Zn, As, Se, Cd, Sn, Hg and Pb was relatively bigger, thus, the pollution was man-made.