Ecological assessment of medicinal vegetable raw materials of the Voronezh region on the example of flowers of a tansy ordinary

The article addresses to the problems of contamination by heavy metals of herbal substances in Voronezh Oblast, Russia. The object of the study was Tanacetum Vulgare gathered in urban and agro-ecosystems exposed to anthropogenic impact. The research was conducted by atomic absorption spectrophotometric method, using the MGA-915MD atomic absorption spectrometer in accordance with pharmacopoeia method. The study gave consideration to 51 samples of Tanacetum Vulgare contaminated by heavy metals (plumbum, mercury, cadmium, nickel, copper, zinc, cobalt, chromium) and arsenic. All samples meet the existing requirements, specified in reference documentation, in regards to norms of contained heavy metals (plumbum, cadmium, mercury) and aresnic. Comparing the data on the content of heavy metals in top soil of the region and the content of these elements in Tanacetum Vulgare blossoms, it can be argued that there exist some substantial physiological barriers preventing the plants from accumulation of ecotoxicants in their reproductive organs...