Abstract
The combined method of analytical control of the concentration of combustible substances with preliminary oxidation in a barrier discharge is considered, where the analyzed substance is subjected to a combination of certain types of energy effects, which allows obtaining measurement information about the composition or physicochemical properties of the analyzed substance. In analytical practice, in a barrier discharge, ozone is synthesized in a device consisting of two coaxially located metal electrodes in the form of a tube and a rod separated by a dielectric from the pyrite glass, the gap of which is filled with air at the atmospheric pressure. The process of obtaining ozone in the device proceeds in two stages. At the first stage, endothermic dissociation of oxygen molecules occurs to atoms, and at the second (exothermic) stage, a reversible reaction of ozone formation occurs. During electro-cracking in a gaseous hydrocarbon environment in a barrier discharge, hydrocarbon molecules are splitting to the radicals. The nature of the chemical reactions and, consequently, the composition of the reaction products are determined by the initial composition of the initial substances, their pressure, as well as the time of action of the electric discharge and its power. In the interaction of atomic oxygen with the products of the electro-cracking of molecules of the analyzed substance, the balance in ozone formation is disturbed, which leads to a decrease in the ozone concentration in the barrier discharge. Changes in the concentration of ozone in the presence of vapors of liquid hydrocarbons and petroleum products in the air, directly in the ozone synthesizer, makes it possible to use the method of analytical control under consideration to determine the concentration of vapor-gas mixtures of combustible substances and petroleum products, as well as to measure saturated vapor pressure of liquid hydrocarbons, petroleum products and fuels.
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