highly significantp < 0.001
Two-way ANOVA confirmed highly significant main effects of both sample type (F = 28.4–52.3, p < 0.001) and functional zone type (F = 18.6–35.2, p < 0.001) on all metal concentrations, with significant interactions for Pb, Cu, Zn, and Cr ( p < 0.05) indicating that enrichment patterns varied among functional zones ( Table 3 ).