Calibration and Application of a Passive Air Sampler (XAD-PAS) for Volatile Methyl Siloxanes

详细信息    查看全文

• 作者：Ingjerd S. Krogseth ; Xianming Zhang ; Ying D. Lei ; Frank Wania ; Knut Breivik
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2013
• 出版时间：May 7, 2013
• 年：2013
• 卷：47
• 期：9
• 页码：4463-4470
• 全文大小：316K
• 年卷期：v.47,no.9(May 7, 2013)
• ISSN：1520-5851

文摘

Because the atmosphere is key to understanding the environmental behavior of volatile methyl siloxanes (VMS), a variety of reliable air sampling methods are needed. The purpose of this study was to calibrate and evaluate an existing, polystyrene鈥揹ivinylbenzene copolymeric resin-based passive air sampler (XAD-PAS) for VMS. Sixteen XAD-PAS were deployed for 7鈥?8 days at a suburban site in Toronto, Canada, while the VMS concentration in air was monitored by an active sampling method. This calibration and a subsequent field test further allowed for investigation of the temporal and spatial variability of VMS in the region. Uptake in the XAD-PAS of octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and three linear VMS was linear throughout the whole deployment period. Sampling rates were between 0.4 and 0.5 m³/day. The XAD-PAS measured 鈭慥MS concentrations ranged from nondetects in rural areas (n = 3), to 169 卤 49 ng/m³ in the urban region (n = 21), to levels above 600 ng/m³ at sewage treatment plants (n = 2). Levels and composition of VMS within the urban area were remarkably uniform in space. Levels, but not composition, were highly variable in time and weakly correlated with temperature, wind speed, and wind direction.