Han Le, Christine Urbina, Lynn Do / Chemistry & Biochemistry / Faculty Mentor: Kevin Schug
This research focuses on an analytical method for identifying and quantifying 43 odorous compounds in air samples using gas chromatography triple quadrupole mass spectrometry (GC-QQQ-MS) in a single analytical run. Air samples were collected in 1-liter SilcoCan air sampling canisters to maintain sample integrity and analyzed via direct injection into the GC-QQQ-MS system. The method utilizes multiple reaction monitoring (MRM), enhancing sensitivity by reducing chemical noise and allowing detection in the low parts-per-billion (ppb) range. Detected compounds include volatile organic compounds, volatile fatty acids, and sulfur- and nitrogen-containing odor compounds that are commonly found in landfills and have been considered thresholds. Precise quantification of these compounds was achieved and compared to their odor thresholds to assess odor impact. This approach provides a practical tool for evaluating odor sources and enables targeted mitigation strategies for the most impactful compounds. By identifying and quantifying specific odorants, this method can help improve environmental quality and reduce physiological responses associated with odors. It offers a valuable resource for waste handling operations (WHOs) to mitigate odor-related impacts effectively. Overall, the study contributes to the development of more effective odor management strategies.
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