## 3 Results and Discussion
### Accumulation and Translocation of PTEs
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Publication**} & \multirow{2}{*}{**Plant Species**} & \multirow{2}{*}{**Sampling Location**} & \multirow{2}{*}{**Factor**} & \multicolumn{6}{c}{**PTEs**} \\ \cline{5-10}  & & & & **Cd** & **Cu** & **Ni** & **Pb** & **Hg** & **Zn** \\ \hline \multirow{3}{*}{Our study} & \multirow{3}{*}{_Mellotus albus_} & \multirow{3}{*}{Agricultural soil} & BCF & n.d. & 0.26 & 0.04 & 0.03 & 0.04 & 0.16 \\  & & & BAC & n.d. & 0.2 & 0.023 & 0.06 & 0.08 & 0.18 \\  & & & TF & 0.8 & 0.79 & 0.76 & 1.51 & 1.76 & 1.39 \\ \hline \multirow{3}{*}{[PERSON] et al. [1]} & \multirow{3}{*}{_Mellotus officinalis_} & \multirow{3}{*}{Mine} & BCF & n.d. & 0.75 & n.d. & n.d. & n.d. & n.d. \\  & & & BAC & n.d. & n.d. & n.d. & n.d. & n.d. & n.d. \\ \cline{2-10}  & & & TF & n.d. & 0.08 & n.d. & n.d. & n.d. \\ \cline{2-10}  & & & BCF & n.d. & 0.29 & n.d. & n.d. & n.d. & n.d. \\ \cline{2-10}  & & & BAC & n.d. & n.d. & n.d. & n.d. & n.d. \\ \cline{2-10}  & & & TF & n.d. & 0.37 & n.d. & n.d. & n.d. \\ \hline \multirow{3}{*}{[PERSON] et al. [1]} & \multirow{3}{*}{Mine} & BCF & 1.07 & 0.49 & 0.55 & 1.25 & n.d. & 0.27 \\  & & BAC & 2.59 & 0.62 & 1.85 & 2.03 & n.d. & 2.11 \\  & & & TF & 1.19 & 0.9 & 0.75 & 1.12 & n.d. & 1.02 \\ \cline{2-10}  & & & BCF & 0.9 & 0.59 & 0.52 & 1.29 & n.d. & 0.28 \\  & & & BAC & 0.83 & 1.52 & 2.95 & 0.9 & n.d. & 2.64 \\  & & & TF & 0.94 & 1.16 & 1.15 & 1.05 & n.d. & 1.3 \\ \hline \multirow{3}{*}{_Congza bonariensis_} & \multirow{3}{*}{Sewage sludge dump} & BCF & 1.86 & 0.75 & 0.94 & 2.04 & n.d. & n.d. & 0.34 \\  & & BAC & 0.95 & 4.26 & 1.61 & 7.92 & n.d. & 1.04 \\  & & TF & 8.23 & 1.09 & 0.58 & 0.91 & n.d. & 0.66 \\ \cline{2-10}  & & & BCF & 1.36 & 0.86 & 0.66 & 1.75 & n.d. & 0.38 \\  & & & BAC & 0.74 & 1 & 2.06 & 0.71 & n.d. & 2.34 \\  & & & TF & 0.56 & 0.55 & 0.62 & 0.57 & n.d. & 0.99 \\ \hline \multirow{3}{*}{_Rumex dentatus_} & \multirow{3}{*}{Sewage sludge dump} & BCF & 1.64 & 0.73 & 0.81 & 2 & n.d. & n.d. & 0.32 \\  & & BAC & 0.81 & 1.04 & 3.72 & 0.63 & n.d. & n.36 \\  & & TF & 0.61 & 0.76 & 0.75 & 0.71 & n.d. & 0.8 \\ \hline \multirow{3}{*}{_Solanum nigrum_} & \multirow{3}{*}{Sewage sludge dump} & BCF & 2.72 & 1.04 & 1.02 & 2.79 & n.d. & 0.4 \\  & & BAC & 5.19 & 2.11 & 1.12 & 4.62 & n.d. & 1.02 \\  & & TF & 0.66 & 0.68 & 0.47 & 0.67 & n.d. & 0.66 \\ \hline \multirow{3}{*}{_Lycopersicon esculentum_} & \multirow{3}{*}{Sewage dump} & BCF & 3.18 & 1.32 & 0.31 & 2.97 & n.d. & 0.45 \\  & & BAC & 1.52 & 1.45 & 0.82 & 1.43 & n.d. & 0.89 \\  & & TF & 0.29 & 0.38 & 0.65 & 0.32 & n.d. & 0.56 \\ \hline \multirow{3}{*}{_Phragmites australis_} & \multirow{3}{*}{Sewage dump} & BCF & 1.43 & 0.81 & 0.67 & 1.74 & n.d. & 0.33 \\  & & BAC & 0.97 & 1.18 & 1.92 & 1.04 & n.d. & 1.71 \\  & & TF & 0.89 & 0.69 & 0.79 & 0.95 & n.d. & 0.73 \\ \hline \multirow{3}{*}{[PERSON] et al. [47]} & \multirow{3}{*}{_[PERSON]_} & \multirow{3}{*}{BCF} & n.d. & n.d. & n.d. & n.d. & n.d. & n.d. \\  & & BAC & n.d. & n.d. & n.d. & n.d. & n.d. \\ \cline{2-10}  & & BCF & n.d. & n.d. & n.d. & n.d. & n.d. \\ \cline{2-10}  & & BAC & n.d. & n.d. & n.d. & n.d. & n.d. \\ \cline{2-10}  & & BAC & n.d. & n.d. & n.d. & n.d. & n.d. \\ \cline{2-10}  & & BCF & n.d. & n.d. & n.d. & n.d. & n.d. \\ \cline{2-10}  & & BAC & n.d. & n.d. & n.d. & n.d. & n.d. \\ \cline{2-10}  & & BAC & n.d. & n.d. & n.d. & n.d. & n.d. \\ \cline{2-10}  & & TF & 0.974 & 0.462 & 0.863 & 1.099 & n.d. & 0.176 \\ \hline \multirow{3}{*}{Cosed landfill area} & BCF & n.d. & n.d. & n.d. & n.d. & n.d. & n.d. \\ \cline{2-10}  & & BCF & n.d. & n.d. & n.d. & n.d. & n.d. \\ \cline{2-10}  & & BCF & n.d. & n.d. & n.d. & n.d. & n.d. \\ \cline{2-10}  & & BAC & n.d. & n.d. & n.d. & n.d. & n.d. \\ \cline{2-10}  & & TF & 0.454 & 0.843 & 0.715 & 0.715 & n.d. & 0.581 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: The comparison of bioconcentration factor (BCF), bioaccumulation factor (BAC), and translocation factor (TF), in various studies and our study. Zn. These results suggest that _M. albus_ cannot be classified as a hyperaccumulator.