The accumulation of cadmium, lead and zinc by different vegetables from zasavje (slovenia)
Sommaire de l'article
Zasavje has been exposed to mining and electricity production in last two centuries. Except by emissions from the Trbovlje Thermal Power Plant environment is also polluted by other kinds of industry, which is situated in narrow valleys. In our research soil pollution and accumulation of heavy metals in most common vegetables were investigated in Zagorje ob Savi. Eight gardens in different distances from pollutant sources were included in the field experiment. Samples of topsoil, unwashed and washed edible green parts of endive (Cichorium endiviae) and roots of carrot (Daucus carota) were sampled and analyzed for Pb, Cd and Zn. Heavy metal concentrations in soil and plants were determined using flame and electrothermal atomic absorption spectrometric methods. The results of the soil analysis showed that the soil is not polluted with heavy metals. In contrast, endive leaves and carrot roots from all gardens accumulated high concentrations of Cd. Concentrations of Pb in washed and unwashed leaves of endive indicated that plants are affected by emissions from industry. The concentrations of Cd in analyzed plants are the highest, because it is the most mobile heavy metal.