SUITMA 2005 Cairo - Heavy metal contents in soils of urban-rural gradients in Sofia region
SUITMA 2005 Cairo
| This abstract is about one of the papers of the Properties of unconventional soils theme of the SUITMA 2005 symposium. |
| Vania Doichinova,i | Miglena Zhyanski.i |
Concentrations of Cu, Zn, Pb and Cd were measured in soils, under oak stands in urban (U) - suburban (SU) - rural (R) gradients from Sofia region. The distribution of these heavy metals through genetic profiles, also dependency of the altitude and distance from the center of the town were assessed. Heavy metals concentrations in the upper 0-20 cm soil layers are measured in borders - Cu: U 24.53-70.40 mg/kg; SU 14.10-24.70 mg/kg; R 22.47-53.03 mg/kg; Zn: U 30.60-98.80 mg/kg; SU 29.15-47.47 mg/kg; R 35.97-130.47 mg/kg; Pb U 24.03-31.77 mg/kg; SU 17.80-35.40 mg/kg; R 21.47-57.97 mg/kg; Cd U 0.20-0.40 mg/kg; SU 0.27-0.66 mg/kg; R 0.15-0.33 mg/kg; as the high concentration Zn and Pb are found in rural sample plot closed to the highway. On the base of calculated EF was determined heavy metals contamination of urban environment. Heavy metal contents through the profile line follow the character behavior of concrete chemical element: Cu and Pb top-accumulation and Zn migration. The altitude is a factor of heavy metals distribution in order with nearness to the source of pollution and other climatic elements. The horizontal distribution of Pb with the distance from the city center, shows polynomial allocation with great statistical significance (p < 0.05; R2 = 0.837). Multivariate statistical analysis (PCA) demonstrated that Cd and Pb can be inferred to be tracers of anthropogenic pollution. Zinc takes medium status, whereas Cu is interpreted to be mainly inherited from parent materials.
