Siloxanes Are the Most Abundant Volatile Organic Compound Emitted from Engineering Students in a Classroom

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• 作者：Xiaochen Tang ; Pawel K. Misztal ; William W Nazaroff ; Allen H. Goldstein
• 刊名：Environmental Science & Technology Letters
• 出版年：2015
• 出版时间：November 10, 2015
• 年：2015
• 卷：2
• 期：11
• 页码：303-307
• 全文大小：314K

文摘

Direct human emissions are known to contribute volatile organic compounds (VOCs) to indoor air via various mechanisms. However, few measurements that determine the emissions of a full suite of occupant-associated VOCs are available. We measured occupant-related VOC emissions from engineering students in a classroom using a proton-transfer-reaction time-of-flight mass spectrometer (PTR-TOF-MS). The dominant compound emitted was a cyclic volatile methylsiloxane (cVMS), decamethylcyclopentasiloxane (D5), which is a major inactive ingredient in some personal care products such as antiperspirants. D5 was found to contribute 鈭?0% of the total indoor VOC mass concentration as measured by the PTR-TOF-MS. Octamethylcyclotetrasiloxane (D4) and dodecamethylcyclohexasiloxane (D6) were detected at abundances that were 1鈥? orders of magnitude lower. The per-person emission rate of these three cVMS declined monotonically from morning into the afternoon, consistent with expectations for emissions from daily morning application of personal care products.