Concentration Characteristics and Seasonal Trend of Main Heavy Metal Elements of PM2-5 in Beijing

Abstract

Abstract:

Based on the data of the systematic sampling and analysis of PM2-5 from April 18, 2005 to September 27, 2008 at the east gate of China University of Geosciences, and the newest ambient air quality standard (GB3095-2012), some valuable results were derived from primary analysis on mass concentration characteristics and seasonal variations of PM2-5 and main heavy metal elements Cd, Pb, As, Cu and Zn in it. The results showed that the mass concentration of PM2-5 ranged between 13.1 and 171 μg/m3 with the median of 65.6 μg/m3 for the whole sampling period from spring 2005 to spring 2008, that exceeded the limiting value 35 μg/m3 of the national standard II (GB3095-2012). This indicated that the pollution of PM2-5 was critical. The average 24 hour concentrations of PM2-5 during the Olympic Games and Paralympic Games was 40.7 μg/m3, not exceeding the national standard II. Mass concentration of heavy metal elements in PM2-5 differed between different seasons in different years. The enrichment characteristics for mass concentration of arsenic was the highest among the typical urban pollution elements in winter time. Chemical analysis indicated that diffuse pollution from many different anthropogenic emissions were the main sources of heavy metal pollution such as Cu,Cd,Pb,Zn and As in PM2-5, especially for As, which need to pay more attention on it. This study is only a small contribution to the prevention and control of atmospheric pollution in Beijing.

Key words: Beijing, PM2-5, pollution level, heavy metal, seasonal trend

XU Yang, CEN Kuang, Stefan Norra, Nina Schleicher, CHEN Yuan. Concentration Characteristics and Seasonal Trend of Main Heavy Metal Elements of PM2-5 in Beijing[J]. Geoscience, 2012, 26(5): 975-982.

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