Sorption of nonpolar organic vapors by ice and snow

Article Abstract:

The sorption of nonpolar organic vapors on ice and snow surfaces using two different techniques is investigated. One method measures the adsorption of volatile organic compounds at the air-water interface by gas chromatography. The other technique measures partition coefficients by equilibrating artificial snow with a gas stream of constant vapor concentration. The results indicate that partitioning at the air-ice interface can be estimated by extrapolating adsorption constants for the air-water interface.

Research, Absorption

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Tracking the distribution of persistent organic pollutants

Article Abstract:

Persistent organic pollutants (POP) are volatile organic compounds that rapidly move away from their point of release by migrating through the atmosphere as gases. They condense at high latitudes in low-temperature regions such as the North and South Poles and evaporate as they move to low latitudes. The differences in POP's ability to evaporate and condense as they move from one region to another result in global distillation with fractionation process.

Environmental aspects, Pollutants, Organic compounds

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Measurement of the specific surface area of snow with the nitrogen adsorption technique

Article Abstract:

The nitrogen adsorption technique is an efficient method in the measurement of the surface area of snow. The method utilizes a sample vial containing snow and a reference vial containing an equal amount of snow that has been melted and refrozen to limit its surface area. The difference in volumes of nitrogen delivered to the sample and the reference vials is the basic quantity measured in the method.

Measurement

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