Simultaneous Chemical and Sensory Characterization of VOCs and Semi-VOCs Emitted from Swine Manure Using SPME and Multidimensional Gas Chromatography-Mass Spectrometry-Olfactometry

摘要

Swine manure is associated with emissions of odor, volatile organic compounds (VOCs), and other gases that can affect air quality on local and regional scales. In this research, solid phase microextraction (SPME) and novel multidimensional gas chromatography-mass spectrometryolfactometry (MDGC-MS-O) system were used to simultaneously identify VOCs and related odors emitted from swine manure. Gas samples were extracted from manure headspace using Carboxen/polydimethylsiloxane (PDMS) 85 μm SPME fibers. The MDGC-MS-O system was equipped with two columns in series with a system of valves allowing transfer of samples between columns (heartcutting). The heartcuts were used to maximize the isolation, separation, and identification of compounds. The odor impact of separated compounds was evaluated by a trained panelist for character and intensity. A total of 295 compounds with molecular weights ranging from 34 to 260 were identified. Seventy-one compounds had a distinct odor. Nearly 65% of the compounds for which reactions rates with OH• radicals are known had an estimated atmospheric lifetime \u3c 24 hrs.