# Investigations of Working Characteristics of Transferred Arc Plasma Torch Volume Reactor
## 3 The Results of the Experiment
Sodium, tungsten, titanium and lead were also observed in the analysis of EDS studies, but their content is generally insignificant and ranges only in the range of about 0.01-0.2%. The results of the EDS studies were analyzed according to the atomic mass of the elements. As gases of various compositions are formed during processing the primary feedstock inside the plasma chemical reactor, a gas analyzer was used to evaluate their composition. The gas was collected from inside of the reactor using a specially cooled probe and fed to separate cells in the analyzer for gas analysis. When measuring the gas composition,  
Figure 6: The SEM images of clay powder mixed with hydroquinone and intended for reactor treatment: (**a**) feedstock before entering the reactor and (**b**) feedstock after plasma chemical treatment. Figure 2:0 The EDS measurements of primary feedstock before entering the reactor. the duration of the experiment was 16 min. The dynamics of oxygen and carbon dioxide content during the experiment is shown in Figure 2:1 As observed, the oxygen content at the initial time is about 20%, which corresponds to the total oxygen content in the atmosphere. During the plasma chemical treatment of the primary raw material and at the sixth minute of the experiment, the total O\({}_{2}\) content was reduced by about 5%. This trend lasts for up to 12 min of the experiment, with the total O\({}_{2}\) content inside the reactor reaching about 17%. This decrease is associated with dissociation and the fact that oxygen combines with nitrogen gas. Part of the nitrogen and oxygen also reacts with the hot walls of the plasma reactor. As a result, oxygen concentration decreases. The total CO\({}_{2}\) content at the initial point of the plasma chemical process is equal to 0%. An insignificant increase in these gases was observed at 4 min of the experiment. As it can be observed from the measurement results, the CO\({}_{2}\) inside the plasma chemical reactor increased linearly until the end of the experiment at 16 min. This can be explained by the increase in the amount of atomic carbon as plasma flow temperature increases, as more and more organic products are processed at higher temperatures. During this time, CO\({}_{2}\) content increases up to about 5%. An increase in the concentration of these gases is also a reason for the decrease in total oxygen [21]. The total percentage of SO\({}_{2}\), NO\({}_{2}\) and NO inside the reactor was also measured during the treatment of the clay contaminated with hydroquinone (Figure 9). When analyzing measurement results, the amount of these gases formed in the total volume was not large. The largest amount of NO gas was formed, and the increase was observed at the second minute of the experiment. NO content increased until the 10 th minute of the experiment and reached about 0.027%. Meanwhile, during a further experiment, the total amount of NO remained approximately constant. Gas composition measurements showed a small amount of NO\({}_{2}\) during the experiment. A steady increase in NO\({}_{2}\) was observed throughout the experiment and reached about 0.0025% at the end of the experiment at the 16 th minute. Sulfur dioxide concentrations were also measured during the experiment. As the analysis of the experimental results shows, the dynamics of SO\({}_{2}\) change is very similar to the change of NO\({}_{2}\) concentration [21]. A slight increase in SO\({}_{2}\) was observed throughout the experiment. The highest SO\({}_{2}\) concentration was obtained at the 16 th minute of the experiment and reached about 0.001%. The formation of hydrogen gas and C\({}_{\rm x}\)H\({}_{\rm x}\) compounds was also monitored during the experiment, but no concentration of H\({}_{2}\) gas was observed during the entire experiment. The same result (concentration in the volume reactor 0%) was observed while measuring the concentrations of C\({}_{\rm x}\)H\({}_{\rm x}\) compounds. Figure 2:2 The dependence of gas concentration on the duration of the experiment.