## 3 Results and Discussion
### Analysis of Heavy Metals
\begin{table}
\begin{tabular}{l c c c c c c c} \hline \hline  & \multicolumn{6}{c}{**Concentration of Heavy Metals in Mineral Water Samples (\(\upmu\)g/L)**} \\ \hline
**Name** & **Pb** & **Cd** & **Cr** & **Cu** & **Ni** & **Hg** & **Zn** \\ \hline Amita & 12.5 & 1.6 & 8.0 & 134.8 & 9.7 & 1.4 & 288 \\ \hline Franciszek & 5.2 & 0.6 & 3.4 & 118.8 & 4.5 & 0.6 & 600 \\ \hline Henryk & 8.9 & 1.1 & 5.8 & 347.5 & 6.4 & 0.2 & 983 \\ \hline Jozef & 12.0 & 0.7 & 22.5 & 129.8 & 18.4 & 0.4 & 325 \\ \hline Jozefowianka & 37.0 & 1.9 & 17.0 & 183.3 & 31.8 & 0.3 & 528 \\ \hline Laguna & 14.6 & 1.5 & 3.6 & 181.8 & 3.6 & 1.0 & 983 \\ \hline Naleczowianka & 13.9 & 0.7 & 8.0 & 45.3 & 18.8 & 0.3 & 1300 \\ \hline Primavera & 8.1 & 0.7 & 4.8 & 78.5 & 4.5 & 0.5 & 373 \\ \hline Slotwinka & 39.8 & 2.8 & 46.8 & 400.0 & 37.0 & 0.2 & 993 \\ \hline Ustronianka & 15.2 & 0.7 & 11.0 & 53.5 & 7.4 & 0.1 & 150 \\ \hline Zuber & 41.8 & 1.0 & 12.1 & 195.5 & 15.7 & 0.1 & 313 \\ \hline Zywiecki-Krysztal & 10.5 & 0.8 & 21.7 & 31.3 & 5.5 & 0.4 & 323 \\ \hline min & 5.2 & 0.6 & 3.4 & 31.3 & 3.6 & 0.1 & 150 \\ \hline max & 41.8 & 2.8 & 46.8 & 400.0 & 37.0 & 1.4 & 1300 \\ \hline average & 18.3 & 1.2 & 13.7 & 158.3 & 13.6 & 0.5 & 596 \\ \hline standard deviation & 12.6 & 0.6 & 11.8 & 110.3 & 10.7 & 0.4 & 357 \\ \hline median & 13.2 & 0.9 & 9.5 & 132.3 & 8.6 & 0.4 & 450 \\ \hline coefficient of variation & 0.7 & 0.5 & 0.9 & 0.7 & 0.8 & 0.8 & 0.6 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: The concentration of heavy metals in mineral water samples (\(\upmu\)g/L). Figure 8: The concentration of cadmium in mineral waters (\(\upmu\)g/L). Figure 7: The concentration of lead in mineral waters (\(\upmu\)g/L). Figure 9: The concentration of chromium in mineral waters (\(\upmu\)g/L). Figure 11: The concentration of nickel in mineral waters (\(\rm\mu g/L\)). Figure 12: The concentration of mercury in mineral waters (\(\rm\mu g/L\)). Figure 10: The concentration of copper in mineral waters (\(\rm\mu g/L\)). The performed tests showed that in the mineral water samples selected for analysis, zinc was present in the range from 287.5 \(\upmu\)g/L in Amita water to 1300 \(\upmu\)g/L in Naleczowianka water. It should be noted that for drinking water, zinc does not have a specific limit value required. Trace metals, defined as micronutrients and standardized in the MH regulation of 2017, are copper, nickel, chromium, lead, cadmium, and mercury. The highest concentration of copper was in Slotwinka water, 400 \(\upmu\)g/L, and the lowest, 31.3 \(\upmu\)g/L, in Zywiecki-Krysztal water. It should be noted that in all mineral waters, the value 2 \(\upmu\)g/L Cu, specified in the ordinance of the Minister of Health of 2017, was exceeded. Nickel concentrations ranged from 3.6 \(\upmu\)g/L in Laguna water to 37 \(\upmu\)g/L in Slotwinka water. In the case of nickel, the normalized values (20 \(\upmu\)g/L) were exceeded in only two waters: Slotwinka and Jozefowianka (31.8 \(\upmu\)g/L). The concentration of chromium and cadmium in all waters was below the acceptable values of 50 and 5 \(\upmu\)g/L, respectively. For Cr and Cd, the lowest and the highest concentrations were found for the same mineral waters: Jozefowianka 0.7 and 3.4 \(\upmu\)g/L, respectively, and Slotwinka 2.8 and 46.8 \(\upmu\)g/L, respectively. The mercury concentration in 11 waters was below the standard value (1.0 \(\upmu\)g/L). Only in the Amita water did we found an exceedance, 1.4 \(\upmu\)g/L. The greatest exceedances of the permissible value (10.0 \(\upmu\)g/L) were recorded for lead. The concentration range for Pb was 5.2-41.8 \(\upmu\)g/L. The highest concentrations were found in the following waters: Zuber-41.8 \(\upmu\)g/L, Jozefowianka--37.0 \(\upmu\)g/L, and Slotwinka--39.8 \(\upmu\)g/L. The best water for its low lead content is Franciszek.