CHANGE OF MOBILE FORMS OF HEAVY METALS IN GRAY FOREST SOILS UNDER THE INFLUENCE OF HUMIC PREPARATIONS OBTAINED USING DIFFERENT TECHNOLOGIES

The article presents the results of experimental studies evaluating the effect of humic preparations obtained using different technologies in the content of mobile forms of heavy metals in contaminated gray forest soil. Analyzed humic preparations obtained by classical alkaline extraction technology and innovative ultrasonic cavitation technology of peat. The drugs were added to the gray forest soil artificially contaminated with heavy metals - zinc, lead, cadmium and copper. The humic preparations determined by the concentration of the active substance - the content of humic and fulvic acids. It was found that ultrasonic cavitation technology allows to obtain a more concentrated formulation as compared with the alkaline extraction technology. It was established experimentally that the concentration of mobile forms of heavy metals in the soil is reduced by using humic substances obtained by cavitation technology. These drugs help reduce the concentration of mobile forms 5-15% copper, 50% zinc, 25-30% lead, 5-15% cadmium.The preparations obtained according to the traditional alkaline peat extraction technology, by contrast, increases the mobility of heavy metals. Perhaps the reason for this phenomenon is due to the peculiarities of the chemical composition of the studied drugs. The basis of preparations obtained by cavitation technique lie fulvic and humic acids. They form inactive complexes with heavy metals. The basis of preparations obtained by alkaline technology - soluble potassium humates and fulvates. They can form soluble complexes of heavy metals, thereby increasing their mobility. But the soluble complexes are not stable over time and can be destroyed, with the release of heavy metals.The experimental results were analyzed one year after the laying of the experience.

humic preparations, heavy metals, gray forest soils, cavitation, alkaline extraction