Mobility of lead, zinc and cadmium in alluvial soils heavily polluted by smelting industry
Vanek, A.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju)E-mail:[email protected] | Boruvka, L.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju) | Drabek, O.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju) | Mihaljevic, M.(Karlova Univ. (Czech Republic). Prirodovedecka Fakulta) | Komarek, M.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju)
The mobility of Pb, Zn and Cd was studied in two profiles of alluvial soils (Pribram region, Czech Republic) heavily contaminated by metallurgy. Heavy metals concentrations were determined after digestion with a mixture of HF and HClO4. The mobility was assessed using the mobility factor (MF) representing the proportion of heavy metals present in the exchangeable and carbonate bound fraction based on the Tessier's sequential extraction procedure. The MF ranged from 2 to 46% for Pb, from 19 to 62% for Zn and from 61 to 94% for Cd. The distribution of Zn and Cd varied according to the depth, which was caused by high amounts of these metals present in labile forms. The profile distribution of Pb (the least mobile metal) was characterized by a gradual decrease with depth. The contamination was higher in soils 2.5 km away from the smelter in comparison with the profile in its close vicinity. This fact confirms the existence of extreme fluvial contamination.
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