Scavenging of polycyclic aromatic hydrocarbons by rain

Article Abstract:

Particle scavenging is a more effective removal process for polycyclic aromatic hydrocarbons (PAH) during precipitation events than equilibrium gas scavenging. The process involves the incorporation of both large and small particles into raindrops. PAH scavenging in a series of five storms in the Chesapeake Bay region in the summer of 1992 showed ratios ranging from 10(supra 4) to 10(supra 5) for submicron particles and 10(supra 5) to 10(supra 6), while gas scavenging ratios ranged from 10 to 500.

Methods, Precipitation scavenging, Acid precipitation (Meteorology)

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Concentrations and distributions of polycyclic aromatic hydrocarbons and polychlorinated biphenyls in rainwater

Article Abstract:

Distributions of organic contaminants in rain are examined. Concentrations of polychlorinated biphenyl congeners, polycyclic aromatic hydrocarbons, organic carbon and suspended particles in rain were measured during five storm events occurring adjacent to Chesapeake Bay in late summer 1992. Results demonstrate that nonfilter-retained and filter-retained particulate matter in rainwater are crucial in the overall removal of contaminants from the atmosphere.

Industrial Organic Chemicals, Polychlorinated Biphenyls, Cyclic Crude and Intermediate Manufacturing, Aromatic Hydrocarbons

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Measurement of the particle-size distributions of semivolatile organic contaminants in the atmosphere

Article Abstract:

The effectiveness of a method involving a Berner five-stage, low-pressure cascade impactor in measuring particle-size distributions of polycyclic aromatic hydrocarbons (PAH) in the atmosphere is evaluated. The results showed that the Berner impactor was effective in determining the presence of PAHs in the atmosphere. It worked very well in actual field use and it was able to collect sufficient samples.

Measurement, Air pollution

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