A.V. Zosimov

Photometric determination of chlorine in a gas flow in the presence of ozone

A method was proposed for the determination of chlorine in a gas mixture containing ozone. The method is based on passing the mixture before absorption with a potassium iodide solution through a furnace, where the ozone is decomposed. The concentration of chlorine at the outlet of the furnace is determined photometrically.

Nonstationary effects in ozone generation by barrier discharges in N2/O2 mixtures

The yield of ozone in barrier discharges in oxygen–nitrogen mixtures containing 0.001 to 40% of nitrogen is investigated experimentally. Phenomena of the nonstationarity of processes of ozone generation that differ from the known ozone-zero phenomenon (OZP) apparent in the reduced efficiency of ozone generation in very high purity oxygen at long periods (from hours to tens of hours) of ozonator operation are found. It is established that the characteristic times (from minutes to tens of minutes) of ozone attaining stationary values after changes in the discharge parameters indicate slow adjustment of the surface condition of insulators and thus the heterogeneous decay of ozone to more rapidly changing flows of neutral and charged particles from gas discharge plasma on the surfaces of dielectrics. The possibility of such a scenario is confirmed using a new analytical approach and numerical calculations of the plasma–chemical kinetics of N2/O2 mixtures presented in the accompanying theoretical study.

Interaction of Ozone with Sodium Chloride — a Possible Additional Source of Chlorine in the Atmosphere

The purpose of the work is to investigate the possibility of chlorine gas emission under interaction of ozone with sodium chloride solutions. This relates to the search of real but not yet known sources of chlorine in the atmosphere.

Ozone production and losses in N2/O2 mixtures in an ozone generator

Nonunique ozone concentrations at the output of an ozone generator under identical external conditions of barrier discharge activation of N2/O2 mixtures but with different prehistories of operating practice and employed gas mixtures are investigated theoretically. An analytical approach is developed to determine the ozone yield with regard for its heterogeneous loss. Plasma-chemical and electron kinetics in the N2/O2-mixtures are calculated numerically. The results of numerical calculations are compared to experimental data obtained by the authors. It is noted that the heterogeneous loss of ozone is the probable reason for the observed variety of behavior of О3 concentrations, depending on prehistory of ozone generator operation, along with the N2 and O2 gas flow rates and the specific active power.