Vapor partition

Vapor pressure The rate at which gases and vapors partition from the air into the stratum corneum will be offset by... 

Figures 2 through 4 are graphical representations of the tests performed on the filter/sorbent sampling trains to test for sorbent capacity or breakthrough, and to best determine aerosol/vapor partitioning.

Hewitt, A.D., Comparison of sample preparation methods for the analysis of volatile organic compounds in soil samples solvent extraction vs. vapor partitioning, /. Environ. Sci. Technol., 32(1), 143-149, 1998. 

Organic Compounds (Note Use either of the methods presented below for analysis of all listed elements, except for benzene, which requires the Vapor Partitioning Method.)... 

Preparation of Standards Prepare the Standard Solution as described under the Vapor Partitioning Method. 

Procedure The conditions for the gas chromatograph, or equivalent, are the same as for the Vapor Partitioning Method, except that the column temperature is set at 120°, and the carrier-gas flow is set to 21 mL/min. Accurately transfer 90 mL of sample and 10 mL of perchloroethylene (free of interfer-... 

Contaminants in the atmosphere can be transferred to soil either directly through dry deposition, wet deposition, and vapor partitioning or indirectly... 

This analysis is based on the relationship between the retention time of the probe vapor in the column and the Henry s law constant (vapor partition coefficient) that relates mole fraction adsorbed with equilibrium pressure (1). The connection between retention time, a term that evokes kinetic properties, and an equilibrium constant is not necessarily obvious, but the following analysis shows the retention time to be the Henry s law constant I multiplied by calibration factors (2). At low equilibrium pressures,... 

Organic Vapor-sorbing sensing materials Vapor partition coefficients between air and sensing materials 44... 

Because (ln2)/t - k - k /K, t is directly proportional to the partition coefficient, K, of the solute. In gas chromatography the retention time, t., is likewise directly proportional to the partition coefficient of the solute. Because the values of t. and t are each directly proportional to the vapor partition coefficients of solutes, the same strueture/rate relationships should hold in each case. In gas chromatography the Int. of most homologous series of compounds is directly proportional to the number of carbon atoms. This fact is the basis for the retention index and carbon number systems for organic compounds (19) Correspondingly, in rubber septa the Int of most homologous series of compounds should be directly proportional to the number of carbon atoms ... 

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