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Agricultural ecosystems are the main source of animal food production. The consequences of economic activity are associated with the receipt of substances of anthropogenic origin xenobiotics in various components of ecosystems, their
movement and accumulation.
The first place among the most dangerous for human health toxicants is occupied by heavy metals (HM). A classic example of such migration mechanisms is the "grazing chain", which begins with grazing plants when they are eaten by farm animals. An important role is played by contamination of the plant surface as a result of settling from the air on the leaves and stems of metalcontaining particles. In the diet of the person surface akrasanee TM does not play a significant role, since before use they are cleaned and washed. This is not the case with animals that eat superficially contaminated pasture or hay harvested from it. In this case, HMS deposited in the dust should be considered as part of the flow entering the food chain. In this regard, the maximum transition coefficients (KP) from the diet to animal products (milk, meat) differ in the pasture period of animals.
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