## 3 Results
### Heavy Metals Research  
The full set of data and descriptive statistics for the tested heavy metals are summarized in Table 3. The obtained values indicate a slight variation in metal concentrations at all sites, which was confirmed by the similar mean and median values. Four of the analyzed metals (chromium Cr, copper Cu, nickel Ni, and lead Pb) were present at low concentrations with large differentiation of concentrations. The ranges of the determined metals were: 0.77-12.83 mg chromium Cr/kg, 0.74-20.74 mg copper Cu/kg, 0.57-56.14 mg nickel Ni/kg, and 5.81-20.43 mg lead Pb/kg. The cadmium Cd values ranged from 0.6 to 1.86 mg/kg of soil, indicating high contamination of the soils with this metal. Also, the degree of contamination of the soils with cadmium Cd was the highest compared to other metals. The studies showed an average of 13% of the cadmium Cd load on the soils in relation to the limit value causing the risk (10 mg/kg). The remaining heavy metals can be ranked in the following order of the soil percentage with respect to the risk limit: lead Pb (2.38%) > copper Cu (1.14%) > nickel Ni (1.04%) > chromium Cr (0.72%). The conducted research has shown that the tested soils pose the greatest threat due to the known content of the most toxic metals, i.e., cadmium Cd and lead Pb. \begin{table}
\begin{tabular}{l l c c c c} \hline \hline
**Site** & **Name of Point** & **Cr** & **Cd** & **Cu** & **Ni** & **Pb** \\ \hline  
zulin Prehod & 2.9 \(\pm\) 0.4 & 1.7 \(\pm\) 0.5 & 4.9 \(\pm\) 0.5 & 2.77 \(\pm\) 0.3 & 10.6 \(\pm\) 2.0 \\ \hline
18 & Wielki Lan & 1.0 \(\pm\) 0.2 & 1.0 \(\pm\) 0.2 & 5.4 \(\pm\) 0.5 & 3.64 \(\pm\) 0.4 & 5.81 \(\pm\) 0.7 \\ \hline
19 & Wola Wereszczyriska & 3.2 \(\pm\) 0.5 & 1.6 \(\pm\) 0.4 & 10.9 \(\pm\) 1.5 & 0.85 \(\pm\) 0.07 & 10.6 \(\pm\) 2.0 \\ \hline
20 & Wolka Wytycka & 5.4 \(\pm\) 1.0 & 0.6 \(\pm\) 0.1 & 2.9 \(\pm\) 0.3 & 3.4 \(\pm\) 0.4 & 8.07 \(\pm\) 1.5 \\ \hline
21 & Zeremitska & 2.6 \(\pm\) 0.4 & 1.9 \(\pm\) 0.5 & 7.6 \(\pm\) 0.6 & 10.8 \(\pm\) 1.0 & 20.4 \(\pm\) 5.0 \\ \hline
22 & Minimum & 0.8 \(\pm\) 0.9 & 0.6 \(\pm\) 0.1 & 0.7 \(\pm\) 0.06 & 0.57 \(\pm\) 0.06 & 5.81 \(\pm\) 0.7 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Geochemical analysis results and uncertainty in the soil of the Poleski National Park [mg/kg]. The soils showed low contents, but were characterized by spatial differentiation in the presence of trace metals (Figure 4). The sites of Astrosciezka, Las Tafle, Lipniak, Mietilukka, Ostoja Poleska, Sciezka Splawy, Urszulin Premod, Wola Wereszczynska, and Zereminska showed higher concentrations compared to other locations. Chromium Cr obtained the highest values at the positions of Lipniak (11.90 mg/kg) and Mietilukka (12.83 mg/kg). Comparably, the highest values of cadmium Cd, in the range of 1.73-1.74 mg/kg, were found in the soil at the sites of Mietiluk, Ostoja Poleska, and Urszulin Premod, with the maximum value (1.86 mg/kg) at the site of Zereminska. The highest concentrations of copper Cu were found at the sites of Astrosciezka (20.74 mg/kg), Ostoja Poleska (17.87 mg/kg), and Wola Wiereszczynska (10.85 mg/kg). The highest concentration of nickel Ni (56.71 mg/kg) was found at the Las Tafle site. It was the highest concentration value for all metals. Apart from this position, nickel Ni achieved much lower concentrations in the remaining positions. The nickel Ni content in the soil at the sites of Astrosciezka and Zereminska was 11.47 g/kg and 10.84 mg/kg, respectively. Increased lead Pb concentrations in the soil were also recorded at these sites, reaching 16.17 mg/kg and 20.43 mg/kg, respectively. Apart from these two sites, higher concentrations of lead Pb were found at the Sciezka Splawy site, amounting to 17.36 mg/kg. The different content of metals in the soils is likely to be due to the different grain size distribution. Greater accumulation can be observed in fine-grained materials (Figure 5).