Carbon chemical species in size-resolved airborne particulate matters collected on January 14 and October 16-17, 2010 at SINAP, a suburban spot in northwest Shanghai, and in three standard samples (oxalic acid, sucrose and graphite), were characterized on October 19-21, 2010 with the near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. The C(1s) NEXAFS spectra differ distinctly among the freshly collected particulate matters of different size ranges and different collection hours, i.e. in day time or at night. The difference is mainly the asymmetrical distribution of carboxyl-COOH,...
