Low frequency inductive dielcometry - informative method for the study of the structuring of water in aqueous solutions

Possibility to study inner water structure using frequency dependence of dielectric loss tangent by low-frequency inductive dielcometry has been considered. Experimental setup at the range 40-800 kHz was based on a standard Q-meter with specialized inductance coils. Features of the method and setup have been demonstrated using bi-distilled water, and solutions of non-organic electrolytes and biologically active molecules with concentrations varied in a wide range. It has been shown that bi-distillate water presents decreased frequency dependences of dielectric loss tangent; one should use fresh samples to provide good reproducibility. LiNO3 solutions shows strong and non-monotonic dispersion of dielectric loss tangent for the concentration range of 10-4-10-6 M; this results in formation of discrete spectra, strongly variable with concentration within the range. At a concentration -6 M, lithium salts present curves similar to those for bi-distilate. On the contrary, bio-active molecular solutions, like potassium phenozan, show nearly similar dispersion spectra for a very wide concentration range at least from 10-5 to 10-16 M. We propose to interpret the low frequency range of the dielectric loss tangent spectrum as a result of inner water structure originated in contact with the ions and organic molecules.