Laboratory photo-microcosms - Emulsion molecular-level data

Photo-oxidation microcosms were performed with a light (Macondo) and medium (Arab Medium) crude oil. The photo-modified crudes were isolated (sacrificed) at different irradiation times. The oils were subsequently fractionated into acidic and non-acidic fractions, as well as interfacially-active material (IM). The IM was fractionated by a modified amino-propyl silica (MAPS) method to yield 10 fractions. This dataset includes the Fourier Transform Ion Cyclotron Resonance (FT-ICR) mass spectrometry results for both oils, at four different irradiation times, and for all chromatographically isolated fractions. Ketone isolates from the photo-oxidized crudes were analyzed as well. This dataset supports the publication: Niles, S. F., Chacón-Patiño, M. L., Chen, H., McKenna, A. M., Blakney, G. T., Rodgers, R. P., & Marshall, A. G. (2019). Molecular-Level Characterization of Oil-Soluble Ketone/Aldehyde Photo-Oxidation Products by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry Reveals Similarity Between Microcosm and Field Samples. Environmental Science & Technology, 53(12), 6887–6894. doi:10.1021/acs.est.9b00908