D. Salkova*, M. Panayotova-Pencheva Department of Experimental Parasitology, Institute of Experimental Morphology, Pathology and Anthropology with Museum, Bulgarian Academy of Sciences, Acad. G. Bonchev 25, 1113 Sofia, Bulgaria (Manuscript received 18 January 2016; accepted for public

I. Zhelyazkova, S. Atanasova, V. Barakova, G. Mihaylova Abstract. Sample taking was carried out in the active bee season of 2010 (June – July) in order to make a comparative analysis of the content of some heavy metals and metalloids (copper Cu, zinc Zn, lead Pb, cadmium Cd, nickel Ni