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The article discusses the results of study for the optical properties (luminescence) of aqueous solutions with low concentrations of lucigenin. One new methodology for the mathematical processing of luminescence spectra is presented. The method to prepare the solutions, which can be used to identify critical points (D.I. Mendeleev's decrement) in the physicochemical properties of aqueous solutions, is considered.

An approach has been proposed for determining the space-time parameters of the formation pro cess of Liesegang rings. This approach relates the processes of the formation of nanoparticles and dense peri odic precipitates from them. Dynamic light scattering is employed to reveal periodic variations in the inten sity of light scattered by nanoparticles with different sizes, from which Liesegang rings are formed. A relation ship between the periods of the variations in the intensity of light scattered by nanoparticles (microscopic process) and the times of the formation of Liesegang rings as a whole (macroscopic process) has been found.