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《Environmental Science & Technology》 2017-01
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Atmospheric Particulate and Gaseous Pollutants Removal Efficiency by Rainfall and the Influencing Factors

ZOU Changwei;HUANG Hong;YANG Fan;LIU Xing;TSANG Po Keung;ZHU Fangxu;LIU Yi;School of Resource, Environment and Chemical Engineering, Nanchang University;The Hong Kong Institute of Education;Research Institute No.270, China National Nuclear Corporation;  
Rainfall is one of most important sink of atmospheric pollutants.Air pollutants affect water chemical composition.It is very significant to quantify atmospheric pollutants removal efficiency by rainfall accurately,which could offer basis data to the simulation of atmospheric pollution and the intervention and removement of atmosphereic pollution by man scientifically.Several air pollutants(TSP,SO_2,NO_2,NH_3) before and after raining in Nanchang were sampled and determined from September 29,2014 to January 12,2015.At the same time,rain was collected and weather factors were recorded.Atmospheric pollutants removal efficiency by rainfall were calculated and compared.Affection fators on removal efficiency of pollutants were discussed.Results showed that certain degree atmospheric pollutants were removed by rainfall.But removal efficenecies of different pollutants were different.Removal efficiency of particulate was higher than that of gaseous pollutants because of different effects mechanism on the pollutants by rainfall.The sorting of removal efficiency of gaseous pollutants by rainfall depends on the sorting of their solubility in water.Continuous days of rain make removal efficiency of air pollutants declining.Rainfall capacity and removal efficiency of pollutants by rainfall were positively correlated.The greater the rainfall intensity,the higher the atmospheric pollutants removal efficiency of rainfall was.Atmospheric pressure affects removal efficiency of pollutants by rainfall indirectly by affecting rainfall capacity directly.During certain relative humidity range from71.1%to 93%,the greater the relative humidity,the higher removal efficiency of pollutants was.
【Fund】: 国家自然科学基金资助项目(NSFC 41265009)
【CateGory Index】: X51
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