The results of a study of the content of heavy metals (zinc, lead, cadmium and copper) in the agroecosystem of the southern zone of the Middle Amur region according to the "soil– plant –water" scheme by inversion voltammetry are presented. In the period 2021–2024, the following studies were conducted: farm soil; fertilizers applied (carbamide and superphosphate); irrigation water; vegetable products (beets, carrots, cabbage, potatoes) grown in the ground. Superphosphate contained as impurities (mg/kg): zinc – 25.4±3.8; cadmium – 0.21±0.03; lead – 12.5±0.8; copper – 13.2±1.9. Impurities were found in carbamide (mg/kg): zinc – 18.9±2.8; cadmium – 0.22±0.03; lead – 13.5±0.8; copper – 23.5±3.5. Thus, these fertilizers are sources of heavy metals entering the soil. However, the average concentrations of these chemical elements in the soil, although they exceeded the background concentrations, were significantly lower than the approximate permissible concentrations. This makes it possible to classify arable soils in terms of heavy metal content as slightly polluted, which do not pose a danger to human health. The content of zinc, copper, lead and cadmium in irrigation water is significantly lower than the maximum permissible concentrations. Thus, the residents of the region are provided with vegetables that meet the safety requirements for the content of heavy metals.

Egorova Irina V., Panova Lyudmila P., Rodionova Natalia A., Smirnova Victoria N.

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