METHOD FOR CONTROLLING INFLUX OF HEAVY METALS AND ARSENIC AS PART OF SEDIMENTARY LOAD ON ARABLE RECLAIMED LANDS OF FLOODPLAIN AGRICULTURAL LANDSCAPE Russian patent published in 2024 - IPC G01N33/24 A01G20/20 

FIELD: ecology.

SUBSTANCE: invention relates to ecology, particularly geoecology, as well as to complex land reclamation. Method involves selection of a controlled area of the investigated floodplain, placing on it before the flood of plastic piled mats imitating the cover of the investigated surface, removal of mats after flood completion, drying of silt deposit to air-dry state, extraction of sediments from pile surface of mats, weighing and determination of qualitative and quantitative composition of heavy metals in them. On the selected section of the floodplain, mats with a fleecy surface imitating arable soil cover are placed, 4 pieces/ha with size of 0.14 m² — 0.2×0.7 m at distance of 40 m from each other in the plan along the diagonal of the section, placing the mats with the long side along the diagonal. After descent of water, removal of mats, drying and extraction of silt deposit, sediments are weighed and mixed from all mats and, without dividing them into fractions, qualitative and quantitative content of bulk forms of heavy metals and arsenic in sediments is determined in an average sample. Their concentration coefficient is calculated, defined as the ratio of the content of the element in the sediment to the regional soil background, as well as total input of heavy metals and arsenic in sediments into underlying alluvial arable soil during annual flood.

EFFECT: method makes it possible to determine content of heavy metals and arsenic in sediments with higher accuracy, to give an objective comparative assessment of the annual contamination of alluvial arable soil with bulk forms of heavy metals and arsenic in sediments, determine the total input of heavy metals and arsenic in the composition of the annual sedimentary load on floodplain areas of arable lands and based on the results, propose preventive measures to reduce the availability of toxicants for plants.

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