| Title: | Spatial variation of volatile organic compounds in a 'Hot Spot' for air pollution |
| Author(s): | Zhu X; Fan ZT; Wu X; Meng Q; Wang SW; Tang X; Ohman-Strickland P; Georgopoulos P; Zhang J; Bonanno L; Held J; Lioy P; |
| Address: | "University of Medicine and Dentistry of NJ (UMDNJ), USA" |
| DOI: | 10.1016/j.atmosenv.2008.07.039 |
| ISSN/ISBN: | 1352-2310 (Print) 1352-2310 (Linking) |
| Abstract: | "The spatial variations of volatile organic compounds (VOCs) were characterized in the Village of Waterfront South neighborhood (WFS), a 'hot spot' for air toxics in Camden, NJ. This was accomplished by conducting 'spatial saturation sampling' for 11 VOCs using 3500 OVM passive samplers at 22 sites in WFS and 16 sites in Copewood/Davis Streets (CDS) neighborhood, an urban reference area located approximately 1000 m east of the WFS. Sampling durations were 24 and 48 h. For all 3 sampling campaigns (2 in summer and 1 in winter), the spatial variations and median concentrations of toluene, ethylbenzene, and xylenes (TEX) were found significantly higher (p < 0.05) in WFS than in CDS, where the spatial distributions of these compounds were relatively uniform. The highest concentrations of methyl tert-butyl ether (MTBE) (maximum of 159 mug m(-3)) were always found at one site close to a car scrapping facility in WFS during each sampling campaign. The spatial variation of benzene in WFS was found to be marginally higher (p = 0.057) than in CDS during one sampling campaign, but similar in the other two sampling periods. The results obtained from the analyses of correlation among all species and the proximity of sampling site to source indicated that local stationary sources in WFS have significant impact on MTBE and BTEX air pollution in WFS, and both mobile sources and some of the stationary sources in WFS contributed to the ambient levels of these species measured in CDS. The homogenous spatial distributions (%RSD < 24%) and low concentrations of chloroform (0.02-0.23 mug m(-3)) and carbon tetrachloride (0.45-0.51 mug m(-3)) indicated no significant local sources in the study areas. Further, results showed that the sampling at the fixed monitoring site may under- or over-estimate air pollutant levels in a 'hot spot' area, suggesting that the 'spatial saturation sampling' is necessary for conducting accurate assessment of air pollution and personal exposure in a community with a high density of sources" |
| Notes: | "PubMed-not-MEDLINEZhu, Xianlei Fan, Zhihua Tina Wu, Xiangmei Meng, Qingyu Wang, Sheng-Wei Tang, Xiaogang Ohman-Strickland, Pamela Georgopoulos, Panos Zhang, Junfeng Bonanno, Linda Held, Joann Lioy, Paul eng P30 ES005022/ES/NIEHS NIH HHS/ P30 ES005022-22/ES/NIEHS NIH HHS/ England 2008/10/01 Atmos Environ (1994). 2008 Oct 1; 42(32):7329-7338. doi: 10.1016/j.atmosenv.2008.07.039" |
