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- W2417721024 abstract "Cascade impactor plates are routinely coated with grease to prevent particle bounce. When such media are used to collect semi-volatile air pollutants, gas phase species may absorb into the impaction medium. This absorption artifact would artificially increase the amount of the semi-volatile species attributed to atmospheric aerosols. An understanding of the effect of this artifact will allow a reliable attribution of semi-volatile compounds, for example polycyclic aromatic hydrocarbons (PAH), between the gas and particulate phases. The experimental part of this work consisted of passing aerosol-free gas containing a known concentrations of PAH through a Micro-Orifice Uniform Deposit Impactor (MOUDI). The impaction medium was a 10 {mu}m pore size PTFE membrane to which dibutyl phthalate was applied. This impaction medium has been used in our atmospheric sampling work and has been shown to reduce particle bounce for high particle loadings. After exposure to gas phase PAH for 24 hours, the impaction media were analyzed for PAH using HPLC with a uv diode array detector. The absorption artifact was predicted with a finite element mass transfer model of a single impinging jet. Jets exiting the nozzle with both uniform and nonuniform velocity profiles were modeled. The model predicts the rate of massmore » transfer on lower stages to be ten times greater than that on the upper stages. Comparison of the experimental and modeling results will be presented along with conclusions about the importance of this artifact in atmospheric sampling.« less" @default.
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- W2417721024 date "1995-12-31" @default.
- W2417721024 modified "2023-09-23" @default.
- W2417721024 title "Measurement and prediction of the absorption of polycyclic aromatic hydrocarbons onto greased impaction" @default.
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