Abstract:Abstract. Excitation-emission matrix (EEM) fluorescence spectroscopy has been widely used to characterize chemical components of brown carbon (BrC), yet the molecular basics and formation mechanisms of chromophores decomposed by parallel factor (PARAFAC) analysis are not fully understood. Here, water-soluble organic carbon (WSOC) in aerosols from Karachi, Pakistan, were characterized with EEM spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Three PARAFAC components were… Show more
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