Title: Study on Chemical Composition Characteristics of PM1 during a Haze Period in Winter of Chengdu Urban Area
Abstract: In order to analyze the mass concentration change tendency of main chemical composition and pollution characters of PM1 in Chengdu urban area under the typical winter haze weather,we have acquired samples of PM1 (Particulate Matter) in the atmosphere from January 1st,2016 to 7th,which is in a period time of haze weather.Firstly,observe the change tendency of the mass concentration of PM1,and then analyze the change tendency of 11 inorganic elements,which are Al、As、Ca、Fe、K、Mg、Mo、Se、Zn、Ti、Li,and 6 inorganic ions,which are Cl-、NO3-、SO42-、NH4+、K+、Ca2+,and the change tendency of OC,EC.The result show that the average concentration of PM1 is up to 109.74 μg/m3 during haze,which is 1.84 times compared with non polluted weather.Moreover,the average concentration of Ca and Fe are high along with great change tendency.Secondary water-soluble inorganic ions (SO42-、NO3-、NH4+) in the total ion concentration accounted as high as 87.43 %,of which the value of NO3-/SO42-is 0.75.OC(Organic Carbon) is the main component of TC (Total Carbon).What is more,the average value of OC/EC (Elemental Carbon) is 3.5,and the contribution rate of SOC (Secondary organic carbon) to OC is 46 %.The results above illustrate that haze weather and winter weather condition cause the concentration of PM1,inorganic elements,water-soluble inorganic ions and TC increased significantly in Chengdu urban area.The principle pollution sources are construction dust and soil sand dust,and the fixed pollution sources contributed more than mobile pollution sources.There is a obvious increase on secondary aerosol generating quantity.
Publication Year: 2017
Publication Date: 2017-01-01
Language: en
Type: article
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