《A passive air sampler for characterizing the vertical concentration profile 》.pdf

Environmental Pollution 159 (2011) 694e699 Contents lists available at ScienceDirect Environmental Pollution journal homepage: /locate/envpol A passive air sampler for characterizing the vertical concentration profile of gaseous phase polycyclic aromatic hydrocarbons in near soil surface air Yuzhong Zhang a, Shuxing Deng a, Yanan Liu a, Guofeng Shen a, Xiqing Li a, Jun Cao a, Xilong Wang a, Brian Reid b, Shu Tao a, * a Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China b School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK A novel passive sampling device was developed and tested for measuring vertical concentration profi le of gaseous phase polycyclic aromatic hydrocarbons in near soil surface air. a r t i c l e i n f o a b s t r a c t Article history: Airesoil exchange is an important process governing the fate of polycyclic aromatic hydrocarbons (PAHs). Received 3 October 2010 A novel passive air sampler was designed and tested for measuring the vertical concentration profile of 4 Received in revised form low molecular weight PAHs in gaseous phase (PAHLMW4) in near soil surface air. Air at various heights 8 December 2010 from 5 to 520 mm above the ground was sampled by polyurethane foam disks held in down-faced Accepted 9 December 2010 cartridges. The samplers were tested at three sites: A: an extremely contaminated site, B: a site near A,