Main scientific interest: 1) contamination by potentially toxic elements (heavy metals) in geomaterials (soil, stream sediment, surface water and groundwater) in urban areas and mining, industrial and agricultural sites; 2) assessment of natural background levels of potentially toxic elements in geomaterials (soil and stream sediment); 3) behaviour of trace elements in the soil and soil-plant system; 4) assessment of air and soil quality by using bioindicators; 5) use of nanoparticles in environmental applications.