Characteristics And Source Apportionment Of Amines In The Northern Suburb Of Nanjing

As the most important nitrogen-containing organic compounds in the atmosphere, amines easily react with sulfuric acid and nitric acid to form ammonium salts, and can be oxidized by ozone, OH radical and NO3radicals, playing an important role in the formation of new particles and secondary aerosols. Therefore, to find out the characteristics and sources of atmospheric amines is a very important and complex topic for prevention and control of atmospheric pollution, and is one of the cutting-edge research topics in recent years.Focusing on this problem, on-line measurements of atmospheric amines were carried out in Northern suburb of Nanjing from August2012to May2013at different seasons. The seasonal variation, daily variation of amines were analyzed and their correlations were studied. Meanwhile, the source apportionment was performed using the positive Matrix Factorization analysis. The main contents include:(1) In this work, we measured the atmospheric organic amine concentrations using high resolution chemical ionization time of flight mass spectrometer (HR-ToF-CIMS). The methods for data and instrument calibration were established.(2) The seasonal variation, daily variation, correlations and impact of meteorological parameters were analyzed. The amine concentration showed a trend of summer>spring> autumn. The concentration in the day was generally higher that at night, which is mainly caused by the change in temperature. Correlation analysis using SPSS showed a good correlation among ammonia and amines, indicating similar emission sources. The relationship between amines and temperature, wind speed and wind direction showed that the amine concentration is generally higher when low-speed and northerly winds were encountered.(3) The sources of amines were analyzed using PMF3.0software recommended by the U.S. environmental protection agency (EPA). The main sources contributing to amines include domestic source, steel and electric power related industry, solvent based industrial source, biomass burning, gasoline vehicle exhausting and diesel exhausting.