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. 2022 Mar 9;12:3868. doi: 10.1038/s41598-022-07789-x

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The comparison of the mean values of Zn (a), Cu (b), Cd (c), Pb (d), and Ni (e) between urban and non-urban soils in different soil types. Different letters indicate significant differences in metal content within each soil type at P < 0.05 confidence interval.