Abstract
Spatiotemporal dynamics of Cu, Zn, Cd and Pb (2021-2023, Gulistan, Khavast and Mirzaabad sites) were assessed. Across nine annual observations, mean, standard deviation, coefficient of variation, criterion-normalized coefficient and integrated load were calculated. Individual coefficients remained below 0.207, and the site-level sum below 0.448. Cadmium showed the highest relative variability; Khavast was distinguished by Cu-Zn-Cd, Mirzaabad by Pb.