Kubelka-munk thesis

The kinetics of direct photochemical transformations of organic compounds in light absorbing and scattering media has been sparsely investigated. This is mostly due to the experimental difficulties to assess the major parameters: light intensity in porous media, the reaction quantum yield and the molar absorption coefficient of the adsorbed compound, ε i ( λ ). Here, we propose a method for the determination of the molar absorption coefficient of compounds adsorbed to air-dry surfaces using the Kubelka–Munk model for the description of radiative transfer. To illustrate the method, the molar absorption coefficients of three compounds, . 4-nitroanisole (PNA), the herbicide trifluralin and the flame retardant decabromodiphenyl ether (DecaBDE), were determined on air-dry kaolinite. The measured diffuse reflectance spectra were evaluated with the Kubelka–Munk model and with previously determined Kubelka–Munk absorption and scattering coefficients ( k and s ), for kaolinite. For all compounds the maximum absorption band was found to be red shifted and the corresponding ε i ( λ ) values were significantly greater than those determined in solvents. Together with the absorption and scattering coefficient of the medium, the measured ε i ( λ ) can be used to determine the quantum yield of the photochemical reaction in this medium from experimentally determined reaction kinetics.

BOYLE, Robert [1626-1691]. 1664. Experiments and considerations touching colours. English (London, England: Henry Herringman). 2nd ed., 1670. Also included in The works of the honourable Robert Boyle , edited by Thomas Birch (London, 1744). Facsimilar reprint, with introduction by Marie Boas Hall (New York, USA: Johnson Reprint Corporation, 1964). {natural philosophy, optics, chemistry}.
Latin edition, Experimenta et considerationes de coloribus (London, 1665). New ed. (Amsterdam: Gerbrandum Schagen, 1667). New ed. (Rotterdam, 1671). New ed. (Geneva, 1676).

Biogeosciences (BG) is an international scientific journal dedicated to the publication and discussion of research articles, short communications and review papers on all aspects of the interactions between the biological, chemical and physical processes in terrestrial or extraterrestrial life with the geosphere, hydrosphere and atmosphere. The objective of the journal is to cut across the boundaries of established sciences and achieve an interdisciplinary view of these interactions. Experimental, conceptual and modelling approaches are welcome. More at Biogeosciences homepage .

Kubelka-munk thesis

kubelka-munk thesis

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