生态环境学报Issue(10)：1689-1694,6.DOI:10.16258/j.cnki.1674-5906.2015.10.015
灰霾天气下重庆地区秋冬金属污染特征及来源分析
Characteristics and Sources of Metal Elements in PM2.5 during Heavy Days in Chongqing during Autumn and Winter
摘要
Abstract
It is necessary to investigate the level, distribution and source apportionment of main metal elements in PM2.5 to understand the regional and urban air pollution and particle pollution control. A continuous measurement of 23 metals was been performed from September 2013 to February 2014 in Chongqing to obtain PM2.5. Comparative analysis of the pollution characteristics of these elements during the hazy days (HD) and non-hazy days (NHD) has been made. PM2.5 and 18 kinds of metal elements in hazy days has increased than normal weather. The main contribution of metals in PM2.5 were K, Fe, Ca, Zn, Pb, Mn, Ba and As. The autumn, winter principal mental concentration on the hazy days were 1.5~2.2 and 1.1~1.7 times higher than those on non-hazy days. Diurnal variation of the concentration of each metal element overall exhibit on the“unimodal”and“bimodal”distribution. The daily variation of autumn and winter haze broadly consistent with the non-haze days. The autumn concentration of Ca, Mn, As is higher than winter, likely influenced by anthropogenic influences.Enrichment factor (EF) analysis for the main elements showed that metal components from anthropogenic origins (Pb, Zn, As and Ba) were highly enriched in PM2.5, especially in hazy days. Factor analysis of futher disclosed that PM2.5 in Chongqing in hazy days mainly derived from soil dusts, emissions from construction industries, metallurgic emissions, and the combustion of fossil fuel. The enrichment factor of Pb, Zn, As, Ba, etc. are moslty from anthropogenic emissions. For the study of regional scale transport of air pollutants, this study use backward trajectory model to simulation the typical pollution autumn and winter period during the autumn and winter, simulation results showed,due to the external transport of contaminated air mass, the local coal-fired combustion, metallurgical and chemical pollution contribution may be the result of the combined action of above area, transmission access point and local source in Chongqing.关键词
重庆/霾/PM2.5/金属元素Key words
Chongqing/haze/PM2.5/metal分类
资源环境引用本文复制引用
刘佳,翟崇治,许丽萍,刘芮伶,沈学勇..灰霾天气下重庆地区秋冬金属污染特征及来源分析[J].生态环境学报,2015,(10):1689-1694,6.基金项目
环保部公益性行业科研专项 （）
