## 3 Discussion  
In the current study we investigated the changes in pH value, redox potential, and molecular oxygen concentration in NaCl solutions under the influence of magnetic fields of various inductances and in the absence of a magnetic field (Figure 1). Our results are generally consistent with the literature data both under the influence of a magnetic field [19; 33; 34], and in its absence [35; 36; 37]. When diluting NaCl solutions, we used a mechanical method (mechanical pipettes and shaking to stir one solution into another). It is known that mechanical action can affect the concentration of molecular oxygen in an aqueous solution [38]. We investigated the effect of shaking on the concentration of molecular oxygen in water (Figure 2). When shaking water saturated with gases, deeration occurs. Conversely, when shaking degassed water, a rapid saturation of water with gases is observed. These processes are probably due to the fact that the water-gas area of contact increases many times during shaking. Comparing the results of this work with the results of [39] allows us to conclude that there is a certain critical concentration of molecular oxygen below which mechanical action causes an increase in concentration, and above which a decrease. In addition, we investigated the effect of magnetic fields of various strengths on the pH of water and NaCl solutions (Figure 3). We showed that with an increase in magnetic field strength, the pH \begin{table}
\begin{tabular}{c c c c c} \hline
**Samples** & **Content** & **pH** & **Redox, mV** & **[O\({}_{2}\)], mg/L** \\ \hline Sample 1 & 2 M NaCl solution mixed with highly diluted NaCl & 5.65 \(\pm\) 0.01 & 290.2 \(\pm\) 2.9 * & 7.88 \(\pm\) 0.01 \\ Sample 2 & 2 M NaCl solution mixed with highly diluted H\({}_{2}\)O & 5.65 \(\pm\) 0.02 & 291.6 \(\pm\) 4.3 * & 7.86 \(\pm\) 0.02 \\ Sample 3 & NaCl without mixing & 5.63 \(\pm\) 0.01 & 275.1 \(\pm\) 2.0 & 7.84 \(\pm\) 0.02 \\ Sample 4 & H\({}_{2}\)O mixed with highly diluted NaCl (10\({}^{-12}\) M) & 5.13 \(\pm\) 0.04 & 424.9 \(\pm\) 8.1 * & 8.43 \(\pm\) 0.03 * \\ Sample 5 & H\({}_{2}\)O mixed with highly diluted H\({}_{2}\)O & 5.04 \(\pm\) 0.07 & 428.2 \(\pm\) 8.8 * & 8.45 \(\pm\) 0.03 * \\ Sample 6 & H\({}_{2}\)O without mixing & 5.15 \(\pm\) 0.05 & 416.5 \(\pm\) 5.1 * & 8.42 \(\pm\) 0.04 * \\ \hline \end{tabular} Note: highly diluted NaCl solutions (10\({}^{-12}\) M) were obtained using a continuous flow microfluidic device. Data are presented as mean \(\pm\) SEM of six independent experiments. * Mean is significantly different from ”NaCl without mixing” group at \(p<\) 0.05.  
\end{table} 
Table 1: Changes in pH value, redox potential, and molecular oxygen concentration after mixing a solution of sodium chloride (2 M) or water with solutions diluted 10\({}^{12}\) times at a \(v/v\) ratio of 1:1.  
decreased, the effect being similar both in deionized water and in aqueous solutions of NaCl at different concentrations. We assumed that under the influence of a magnetic field in the presence of NaCl, the concentration ratio of H+ and OH- ions would differ from that of water. This is indirectly confirmed by an increase in the redox potential observed under the same conditions. We also investigated the effect of magnetic field strength on the redox potential in water and NaCl solutions (Figure 4). We demonstrated that with an increased magnetic field induction, the redox potential also increased; the relative increase depended on the NaCl concentration. Usually, the change in redox potential in deionized water is directly related to the concentration of dissolved molecular oxygen [32], and less often to atmospheric carbon dioxide, which dissolves in water to form carbonic acid [40]. However, the change in the pH values is probably not associated with the presence of sodium cations or chlorine anions in water. The change in pH values is not always associated with the presence of sodium cations or chlorine anions in the water. There are studies that show that new hydrogen bonds are formed in water placed in strong magnetic fields.