Dielectric spectroscopy of structural changes in dilute aqueous solutions of sodium compounds

Structural changes in aqueous solutions of sodium compounds for the concentration range 10-2-10-6 M were detected by high-resolution low-frequency dielectric spectroscopy. All experiments were carried out at room temperature. The experimental results in the frequency range 50-800 kHz are presented as the dependences of dielectric loss tangent on the logarithm of the frequency ω of the excitation of the oscillatory circuit, in the inductor of which a glass tube with the test solution is placed. The observed dependences characterizing the dielectric loss in solutions arising as a result of structural polarization changes are of a pronounced spectral nature. In this case, the positions of the peaks in the spectra are reliably reproduced and characterize the cationic and anionic composition of the solution. Concentration changes in the observed spectra allow us to attribute aqueous solutions of electrolyte salts to classical solutions.