# Mineral Composition of _Chelidonium majus_ L. and Soils in Urban Areas
## 3 Results
### Analysis of Correlation of Microelement and Rare Earth Metal Content in the Plant-Soil System  
The correlation coefficients regarding the content of trace elements within the studied tissue of _Ch. majus_ indicate significant variability (Table S1). A strong correlation was observed between the soil and rhizome for elements such as Zr, which strongly correlates with soil elements like Mo (0.924), Co (0.966), U (0.959), Th (0.929), V (0.923), and W (0.900). A high and statistically significant correlation was found in the stem-soil system for Sr-Li (0.905), W-Sn (0.913), Sb-Ag (0.890), G-Ag (0.837), and others (Table S2). The relationship between soil elements and leaves was identified for parameters such as Sr-Mo (0.970), Sb-Ag (0.962), Ge-W (0.993), and others (Table S3). Overall, the system of dependencies within plant tissues and soil element content for trace elements is highly diverse, which may be linked to the soil materials (parent rock), which, in most cases, in urban parks are of anthropogenic origin. Often, during the construction of urban parks, the soil has been transported from other areas and composting sites.  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & & **Fe** & **Ca** & **P** & **Mg** & **Al** & **Na** & **K** \\ \hline \multirow{6}{*}{**Condens**} & Ca & 0.6116 & & & & & & \\  & P & 0.0735 & 0.2043 & & & & & \\  & Mg & 0.1384 & 0.6672 & 0.8662 * & & & & \\  & Al & 0.1713 & 0.3012 & 0.2364 & 0.3632 & & & \\  & Na & \(-\)0.2675 & \(-\)0.6312 & \(-\)0.3901 & \(-\)0.6186 & \(-\)0.7831 & & \\  & K & \(-\)0.3501 & \(-\)0.5222 & \(-\)0.4674 & \(-\)0.3624 & \(-\)0.1839 & \(-\)0.468 & \\  & S & 0.7768 & 0.102 & 0.0035 & \(-\)0.0475 & 0.5973 & \(-\)0.0834 & 0.7371 \\ \hline \multirow{6}{*}{**Condens**} & Ca & 0.5777 & & & & & & \\  & P & \(-\)0.0263 & 0.7141 & & & & & \\  & Mg & 0.0189 & 0.5 & 0.0396 & & & & \\  & Al & 0.1278 & \(-\)0.508 & \(-\)0.8916 * & \(-\)0.4883 & & & \\  & Na & 0.0808 & \(-\)0.1801 & 0.1762 & \(-\)0.3089 & \(-\)0.5183 & & \\  & K & 0.3843 & \(-\)0.7005 & \(-\)0.8444 * & \(-\)0.6824 & 0.1098 & \(-\)0.4636 & \\  & S & 0.3613 & 0.4849 & 0.2786 & 0.4884 & 0.6556 & 0.6987 & 0.3873 \\ \hline \multirow{6}{*}{**Condens**} & Ca & 0.0717 & & & & & & \\  & P & 0.0649 & 0.5189 & & & & & \\  & Mg & \(-\)0.5832 & 0.6278 & 0.6352 & & & & \\  & Al & 0.6885 & 0.3646 & 0.0245 & 0.3104 & & & \\  & Na & 0.5808 & \(-\)0.0243 & \(-\)0.4582 & \(-\)0.1441 & 0.4722 & & \\  & K & 0.2711 & \(-\)0.3237 & \(-\)0.163 & \(-\)0.417 & \(-\)0.3394 & \(-\)0.055 & \\  & S & 0.6723 & \(-\)0.3427 & \(-\)0.6738 & \(-\)0.4993 & 0.1235 & \(-\)0.1333 & \(-\)0.1713 \\ \hline \hline \end{tabular} \({}^{*}\) Correlation coefficients are significant at \(p<\) 0.050.  
\end{table}
Table 5: Correlation coefficients between the content of major elements in the soil and the analyzed tissues of _Ch. majus_.  
The concentrations of metals in the analyzed tissues and soil are arranged in the order given in Table 6. In the chemical composition of the leaves and rhizomes of _Ch. majus_, K ranks first in the order in all of the analyzed tissues. Ca ranks second in both tissues and soils. The order of elements in soils is slightly different (Table 6). The plants show selective uptake of elements from the soil, concentrating those that are most needed for their functioning. The distribution of elements in the plant varies depending on the part of the plant (Table 6). In leaves, boron (B), in stems, rubidium (Rb), and in rhizomes and soil (in all locations), silver (Ag) rank first in terms of content (Table 2). The next elements with significant values in the order are Ba and Sr.