INFLUENCE OF HUMIC PREPARATION ON INACTIVATION OF NICKEL IN SOIL AND SEDIMENTS
The use of the humic preparation "Darina" contributed to an increase in the concentration of mobile phosphorus and, especially, exchange potassium, with a slight increase in exchange bases in the soil, silt and their mixtures.The drug caused a noticeable increase in the proportion of humic acids in relation to fulvic acids and led to an increase in the mass fraction of powdery and silty fractions of physical clay in the soil, silt and soil-silt mixtures. The effect of the drug had a slight acidification of the soil, silt and their mixtures, compared with the options without the use of the drug. The use of the drug to inactivate Nickel in bottom sediments, soil and their mixtures led to a decrease in the concentration of compounds of water-soluble and mobile forms of metal after each treatment with the drug by the end of the experiment. The best option against the background of the drug, in which the greatest relative detoxification of metal compounds was noted, was option 3, using soil. In comparison with the use of humate, watering the soil, silt and their mixtures with water did not significantly affect the decrease in the concentration of both water-soluble forms of Nickel and mobile forms. Possible mechanisms (ion exchange, complexation, coagulation, adsorption, chemical precipitation) of Ni(II) interaction with various organic (humic and fulvic acids) and mineral (clay minerals and insoluble salts) components of soil, silt and their mixtures are considered. The interaction and transformation of water-soluble and mobile nickel compounds in soil and sediments under the action of humic preparation are noted to have different binding strengths.