Fundamental regional ecological and pharmacognostic studies of the quality of LRS were carried out on the example of Voronezh oblast, and the peculiarities of the accumulation of the most dangerous heavy metals and arsenic in LRS growing both in traditional places of harvesting and in anthropogenic disturbed ecotopes were studied. The highest concentrations of lead are observed in the roots of medicinal dandelion and common burdock, common knotgrass, and plantain leaves. The mercury content in all the studied samples is generally low and does not exceed 10% of the MAC. Higher concentrations of cadmium were found in herbs of bitter wormwood and five-lobed motherwort, roots of common burdock and medicinal dandelion, and leaves of large plantain. The arsenic content in a number of samples of bitter wormwood grass and common yarrow, big plantain leaves, and common burdock roots exceeded the MAC. Nickel is intensively accumulated by the leaves of greater plantain and stinging nettle, by the herbs of five-lobed motherwort, and common knotgrass. The most active concentrators of chromium and cobalt are the roots; chromium also actively accumulates in the leaves of the plants under study. High accumulation of copper was distinguished by herbs. Zinc accumulates to the greatest extent in the studied roots and herbs of plants. Clarkes of the studied elements in plants of the synanthropic flora of Voronezh oblast have been identified, which, along with the MAC, is an important ecological and geochemical indicator for LRS, reflecting the combined impact of technogenic and natural processes occurring in a certain time slice.
N. A. Dyakova (Wed,) studied this question.