Settling Flux of PAHs on the Ground Surface
Year: 2003
Type: article
Abstract: Three methods (bucket, downward and upward surface plate, and water vessel) for measuring dry deposition were used at the three different heights (0.5 m, 1.5 m and 12.5 m) to estimate the real settling fluxes of mass and Polycyclic Aromatic Hydrocarbons (PAHs) in TERC (Tsukuba), Japan. Ambient air samples were also collected there using a high-volume sampler. Particle size distributions and composition of PAHs were measured by the low pressure cascade impactor (LP-20) at NIES which is located about 5 km south of TERC. Settling velocities were calculated as the settling fluxes divided by corresponding average ambient air concentration. The results showed that small particles dominate atmospheric dry deposition of PAHs and that bucket deposition fluxes and net fluxes decrease with height due to re-suspension and/or vertical distribution of suspended particles etc. The results also indicated that downward fluxes overestimated and net fluxes underestimated the real fluxes for both mass and PAHs. To estimate the real fluxes, we can assume that net flux is the first approximation.
DOI: 10.15068/00146979
Authors: A. S. Shannigrahi, Takehiko Fukushima, Noriatsu Ozaki, Shuichi Hasegawa
Language: English
Subfield: Health, Toxicology and Mutagenesis
Field: Environmental Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2290539838