scholarly journals Source identification and characterization of organic nitrogen in atmospheric aerosols at a suburban site in China

2021 ◽  
pp. 151800
Author(s):  
Lu Qi ◽  
Carlo Bozzetti ◽  
Joel C. Corbin ◽  
Kaspar Rudolf Daellenbach ◽  
Imad El Haddad ◽  
...  
Keyword(s):  
Atmospheric Aerosols ◽  
Source Identification ◽  
Organic Nitrogen ◽  
Identification And Characterization ◽  
Suburban Site

scholarly journals Identification and characterization of aging products in the glyoxal/ammonium sulfate system - implications for light-absorbing material in atmospheric aerosols

2012 ◽  
Vol 12 (2) ◽  
pp. 6235-6262
Author(s):  
C. J. Kampf ◽  
R. Jakob ◽  
T. Hoffmann
Keyword(s):  
Ammonium Sulfate ◽  
Atmospheric Aerosols ◽  
Molar Absorptivity ◽  
Molecular Product ◽  
Product Identification ◽  
Absorbing Material ◽  
Identification And Characterization ◽  
Absorbance Band

Abstract. In this study we report the identification of bicyclic imidazoles in aqueous aerosol mimics using HPLC-ESI-MS/MS. 2,2´-Biimidazole was identified to be a major contributor to the 280 nm absorbance band observed in mixtures of glyoxal and ammonium sulfate, despite the fact that its production rate is two orders of magnitude lower than the previously reported production rates of imidazole or imidazole-2-carboxaldehyde. The molar absorptivity of 2,2´-biimidazole was determined to be (36 690±998) M−1 cm−1. This demonstrates the necessity of molecular product identification at trace levels to enable a better understanding of relevant absorbing species. Additionally the formation of lower polarity products including formamides of imidazoles is proposed. The role of imidazoles and other light-absorbing species in the formation of SOA and optical properties of SOA is discussed and potentially interesting fields for future investigations are outlined.

Source identification and characterization of the accumulating non-biodegradable organics in Korean reservoirs

2008 ◽  
Vol 88 (4) ◽  
pp. 1056-1065 ◽  
Author(s):  
Sungwon Kim ◽  
Seungkwan Hong ◽  
Geonha Kim ◽  
Jinsik Sohn ◽  
Euiso Choi
Keyword(s):  
Source Identification ◽  
Identification And Characterization

scholarly journals Identification and characterization of aging products in the glyoxal/ammonium sulfate system – implications for light-absorbing material in atmospheric aerosols

2012 ◽  
Vol 12 (14) ◽  
pp. 6323-6333 ◽  
Author(s):  
C. J. Kampf ◽  
R. Jakob ◽  
T. Hoffmann
Keyword(s):  
Ammonium Sulfate ◽  
Atmospheric Aerosols ◽  
Molar Absorptivity ◽  
Molecular Product ◽  
Product Identification ◽  
Absorbing Material ◽  
Identification And Characterization ◽  
Absorbance Band

Abstract. In this study we report the identification of bicyclic imidazoles in aqueous aerosol mimics using HPLC-ESI-MS/MS. 2,2'-Biimidazole was identified to be a major contributor to the 280 nm absorbance band observed in mixtures of glyoxal and ammonium sulfate, despite the fact that its production rate is two orders of magnitude lower than the previously reported production rates of imidazole or imidazole-2-carboxaldehyde. The molar absorptivity of 2,2'-biimidazole was determined to be (36 690 ± 998) M−1 cm−1. This demonstrates the necessity of molecular product identification at trace levels to enable a better understanding of relevant absorbing species. Additionally, the formation of lower polarity products including formamides of imidazoles is proposed. The role of imidazoles and other light-absorbing species in the formation of SOA and optical properties of SOA is discussed and potentially interesting fields for future investigations are outlined.

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