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The surface rheological properties of organic films on rain water: rain rate correction

100%

Mazurek A. Z., Pogorzelski S. J., Kogut A. D.

Polish Journal of Environmental Studies

2006

tom 15

nr 5

769-776

The presented procedure allows one to recover the film properties present originally at the raindrop surface from the Langmuir trough data supplemented with simultaneously taken rain event characteristics (rain rate and rain drop diameter distribution). It requires the partitioning effect of the surfactant molecules between the surface and bulk phases to be estimated where the entering quantities are: the partitioning coefficient Kp=r/c and a degree of the rain water interfacial system area development Ar/Vr evaluated here using fatty acid concentrations as model input data. The latter parameter depends on particular rain event signatures. The concept is quantified using the Langmuir trough film and disdrometer data on a set of rain water events observed at Gdańsk, Poland in May 2002.

Structural characterization of fatty acid films on rain water: a scaling approach using physical attributes

100%

Mazurek A. Z., Pogorzelski S. J., Kogut A. D.

Polish Journal of Environmental Studies

2006

tom 15

nr 6

A complete compositional or structural description of naturally-occurring surfactants on rain water is not currently feasible. A main limitation of previous work has been the lack of means for correlating force-area characteristics with the chemical makeup of the films. Instead of analyzing the chemical composition of rain water film-forming organics, it is postulated here to introduce the novel scaling procedures (2D virial equation of state and 2D polymer film scaling theory) applied to the surface pressure-area (n-A) isotherms and surface pressure- temperature (n-T) isochors and resulting from generalized physical formalisms modified to a multicomponent surfactant film. A set of the introduced structural film state parameters (n, r, Alim, Eisoth, y, R, Mw, Ps) could become sensitive indicators for surface-active source-specific organic matter pathway tracing, where the measurement of surfactant concentration and chemical analyses are avoided. The concept is quantified using the Langmuir trough film and disdrometer data on a set of rain water events observed in Gdańsk, Poland in May 2002.

Ograniczanie wyników

2 Polish Journal of Environmental Studies

2 Kogut A. D.

2 Mazurek A. Z.

2 Pogorzelski S. J.

2 2006

Wyniki wyszukiwania

The surface rheological properties of organic films on rain water: rain rate correction

Structural characterization of fatty acid films on rain water: a scaling approach using physical attributes