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Physicochemical conditions for the exchange of substances during peloid procedures


, : Physicochemical conditions for the exchange of substances during peloid procedures. Balneologia Bohemica 10(3): 76-82

The exchange of substances between balneological procedures and the [human] organism may be conceived, in the case of peloid procedures, as a flow of substances which is a result of a competition between the solid phase of peloid procedures and the skin surface for substances dissolved in the liquid phase of peloid procedures and in perspiration emerging through the skin surface. The fate of ions dissociated in a model of thermically produced sweat was investigated after contact with chemically different procedures prepared from peat sulfur-ferrous moor. Peloid cures behave basically as catexes. During 20 min they adsorb from sweat part of the cations; simultaneously, sweat declines pH. Adsorbability of cations is not identical to their order according to hydration heat: K+ < Na+ < Ca2+ < Mg2+. The equilibrium constant for the ratio of adsorbed typical mono- and bivalent cations (K'(20'; 25.degree. C)) is 0.29 in peat cures, and 0.30 in moor cures, and is due to the great predominance of univalent cations over bivalent ones, characterized in sweat by the ratio [Na+]/[Ca2+] = 26. Adsorption, ion exchange, depends on the ionic strength of sweat; it is not stechiometric. The ionic current, its direction and quality depend primarily on the electropotential gradient between the procedure and skin surface and the quality of both. In the peloid procedure, it depends on the value of its .zeta.-potential, which according to literature data is -20 mV in peat cures. It is assumed that in moor cures it will have a positive value. Investigation of this activity of peloid cures leads to their classification and to the classification of peloids into those with a negative .zeta.-potential, i.e., a more or less unsaturated ion exchange (sorption) capacity, and those with a positive .zeta.-potential, i.e., with a sorption capcacity already saturated in some way.

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