## 4 Conclusion  
Soil is a great geochemical reservoir for contaminant as well as a natural buffer for transportation of chemical materials and elements in the atmosphere, hydrosphere, and biomass. For this, it is the most important component of the human biosphere. As soil is an important constituent of the human biosphere, any harmful change to this segment of the environment seriously affects the overall quality of human life. The most adverse effect of heavy metals is that they can be introduced into the food chain and threaten human health. Agricultural products growing on soils with high metal concentrations are represented by metal accumulations at levels harmful to human and animal health as well as to the bio-environment. The impact of anthropogenic heavy metal contamination on agriculture soil around DEPZ was evaluated in this study using seasonal variation and indices. All the indices more or less revealed that the study area was seriously affected by different metals. Dry seasons  
\begin{table}
\begin{tabular}{l l l l l l l l l l l} \hline  & **Fe** & **As** & **Mn** & **Cu** & **Zn** & **Cr** & **Pb** & **Hg** & **Ni** & **Cd** \\ \hline
**Dry Season** & & & & & & & & & & \\ Fe & 1 & & & & & & & & & \\ As & 0.467 * & 1 & & & & & & & & \\ Mn & 0.553 * & \(-\)0.048 & 1 & & & & & & & \\ Cu & \(-\)0.004 & \(-\)0.078 & 0.174 & 1 & & & & & & \\ Zn & 0.112 & \(-\)0.020 & 0.226 & 0.964 ** & 1 & & & & & \\ Cr & 0.016 & \(-\)0.096 & 0.164 & 0.972 ** & 0.957 ** & 1 & & & & \\ Pb & 0.263 & 0.512 * & \(-\)0.224 & 0.558 * & 0.570 ** & 0.469 * & 1 & & & \\ Hg & 0.185 & 0.079 & 0.281 & \(-\)0.047 & \(-\)0.129 & \(-\)0.088 & \(-\)0.165 & 1 & & \\ Ni & 0.579 ** & 0.193 & 0.142 & 0.161 & 0.248 & 0.213 & 0.393 & \(-\)0.010 & 1 & \\ Cd & \(-\)0.041 & \(-\)0.122 & 0.217 & 0.978 ** & 0.941 ** & 0.960 ** & 0.410 & \(-\)0.064 & 0.060 & 1 \\
**Wet Season** & & & & & & & & & & \\ Fe & 1 & & & & & & & & & \\ As & 0.753 ** & 1 & & & & & & & & \\ Mn & 0.557 * & 0.223 & 1 & & & & & & & \\ Cu & 0.315 & 0.417 & 0.535 * & 1 & & & & & & \\ Zn & 0.110 & 0.173 & 0.511 * & 0.889 ** & 1 & & & & & \\ Cr & 0.750 ** & 0.571 ** & 0.555 * & 0.703 ** & 0.525 * & 1 & & & & \\ Pb & 0.548 * & 0.454 * & 0.125 & 0.489 * & 0.323 & 0.668 ** & 1 & & & \\ Hg & 0.082 & 0.037 & 0.371 & \(-\)0.158 & \(-\)0.101 & 0.150 & 0.081 & 1 & & \\ Ni & 0.623 ** & 0.547 * & 0.539 * & 0.599 ** & 0.473 * & 0.672 ** & 0.622 ** & \(-\)0.092 & 1 & \\ Cd & 0.296 & 0.351 & \(-\)0.069 & 0.003 & \(-\)0.326 & 0.132 & 0.029 & \(-\)0.091 & 0.099 & 1 & \\ \hline \end{tabular}
* Correlation is significant at the 0.05 level (2-tailed); ** Correlation is significant at the 0.01 level (2-tailed).  
\end{table}
Table 8: Correlation coefficient matrix for the metals in soil around DEPZ during the dry and wet seasons.  
resulted in some multi-fold higher values of the overall indices. These metals with high concentrations in the studied soils may have been mixed with groundwater by leaching. High concentrations of heavy metals in soils around industrial facilities originate from an anthropogenic source which is associated with unrestrained solid release and untreated or poorly treated fluid wastes from these industrial facilities. To control soil contamination, legislative measures must be taken, legally binding the individual industries, forbidding discharge of untreated or poorly treated industrial effluents. Lowering the quality of soil health due to these industries can only be restricted if a zero discharge system ETP is implemented throughout the DEPZ. Immediate steps including regular monitoring of toxic metals in the agricultural soil is needed to check the environmental quality. Wastewater discharged from DEPZ could be recycled for the remediation of pollution in a sustainable and eco-specific way. Moreover different remediation measures should be taking promptly to remove excising metal contamination.