Summertime distributions of peroxyacetyl nitrate (PAN) and peroxypropionyl nitrate (PPN) in Beijing: Understanding the sources and major sink of PAN

摘要: Peroxyacetyl nitrate (PAN), a major secondary pollutant in the atmosphere, has received much concern for its particular importance atmospheric chemistry and adverse effects on human plants. Atmospheric PAN PPN were measured by using gas chromatograph equipped with electron capture detector (GC-ECD) from June to September 2010, source sink firstly studied Beijing. The distinct diurnal variations of maximum afternoon observed, mean values 2.61 +/- 2.57 ppbv = 839) 12.5 0.52 0.38 (N 152) 2.16 during measuring period, respectively. Good correlation (R 0.85) between slope (Delta PPN/Delta PAN) 0.134 indicated that anthropogenic volatile organic compounds (AVOCs) dominated photochemical formation PANs Further, we found acetaldehyde was predominant carbonyl precursor contribution 59.7% total peroxyacetyl (PA) radical. Methyl glyoxal, methacrolein, acetone, methyl vinyl ketone, biacetyl contributed 7.1%, 8.8%, 19.7%, 3.4%, 13% PA radical, Anti-correlation concentrations NO/NO2 ratios whole investigating period. In addition, amount lost thermal decomposition (TPAN) accounted remarkable fractions observed under high temperature both daytime nighttime. (C) 2014 Elsevier Ltd. All rights reserved.