Tracing the biogenic secondary organic aerosol markers in rain, snow and hail.

The molecular characterization of secondary organic aerosol (SOA) is based mainly on LC-MS analyses of particulate matter (PM) samples collected with aerosol samplers. Several studies have analyzed atmospheric waters, including rain and cloud water, for the presence of SOA components, however, no separation techniques were used making identification of the individual components in these complex mixtures impossible. We have applied our improved UHPLC-HR-MS methodology to analyze atmospheric precipitates (hailstone, rain and snow), as well as SOA collected with high-volume samplers.

2-Iodomalondialdehyde is an abundant component of soluble organic iodine in atmospheric wet precipitation.

Iodine plays an important role in the environment and life. In the atmosphere, iodine is present in the form of inorganic and organic compounds. In this study, we have analyzed atmospheric wet precipitation using ultra-high performance liquid chromatography coupled to high resolution mass spectrometry (UHPLC-HRMS) for the presence of organoiodine compounds and found that the main organoiodine compound in atmospheric waters is 2-iodomalondialdehyde.

Structural Characterization of Lactone-Containing MW 212 Organosulfates Originating from Isoprene Oxidation in Ambient Fine Aerosol.

Isoprene (CH) is the main non-methane hydrocarbon emitted into the global atmosphere. Despite intense research, atmospheric transformations of isoprene leading to secondary organic aerosol (SOA) are still not fully understood, including its multiphase chemical reactions. Herein, we report on the detailed structural characterization of atmospherically relevant isoprene-derived organosulfates (OSs) with a molecular weight (MW) of 212 (CHSO), which are abundantly present in both ambient fine aerosol (PM) and laboratory-generated isoprene SOA.

Radical oxidation of methyl vinyl ketone and methacrolein in aqueous droplets: Characterization of organosulfates and atmospheric implications.

In-cloud processing of volatile organic compounds is one of the significant routes leading to secondary organic aerosol (SOA) in the lower troposphere. In this study, we demonstrate that two atmospherically relevant α,β-unsaturated carbonyls, i.e.

Improved UHPLC-MS/MS Methods for Analysis of Isoprene-Derived Organosulfates.

Secondary organic aerosol (SOA) is an important yet not fully characterized constituent of atmospheric particulate matter. A number of different techniques and chromatographic methods are currently used for the analysis of SOA, so the comparison of results from different laboratories poses a challenge. So far, tentative structures have been suggested for many organosulfur compounds that have been identified as markers for the formation of SOA, including isoprene-derived organosulfates.