Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 5 2008 10.5194/acpd-8-17439-2008 http://www.atmos-chem-phys-discuss.net/8/17439/2008/ http://www.atmos-chem-phys-discuss.net/8/17439/2008/acpd-8-17439-2008.html http://www.atmos-chem-phys-discuss.net/8/17439/2008/acpd-8-17439-2008.pdf 17439 17466 2008-09-23 Oligomers, organosulfates, and nitroxy organosulfates in rainwater identified by ultra-high resolution electrospray ionization FT-ICR mass spectrometry K. E. Altieri altieri@marine.rutgers.edu B. J. Turpin S. P. Seitzinger Institute of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ, USA Department of Environmental Sciences, Rutgers University, New Brunswick, NJ, USA Rutgers/NOAA CMER Program, Rutgers University, New Brunswick, NJ, USA Wet deposition is an important removal mechanism for atmospheric organic matter, and a potentially important input for receiving ecosystems, yet less than 50% of rainwater organic matter is considered chemically characterized. Precipitation samples collected in New Jersey, USA, were analyzed by negative ion ultra-high resolution electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Elemental compositions of 552 unique molecular species were determined in the mass range 50–500 Da in the rainwater. Three main groups of organic compounds were identified: compounds containing carbon, hydrogen, and oxygen (CHO) only, sulfur (S) containing CHOS compounds, and S- and nitrogen containing CHONS compounds. 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