The modeling of dissolution of cobalt, nickel, and iron oxides in sulfuric acid shows that the rate determining step of the dissolution is the passage of oxide complexes formed on the surface of oxide particles to a solution. A system analysis of the dissolution curves (α-τ) of the oxides is developed to calculate the kinetic parameters ( E a ). Cobalt oxide Co 3 O 4 dissolves in H 2 SO 4 more rapidly than nickel and iron oxides (Ni 2 O 3 and Fe 2 O 3 ).
The content of heavy metals (cadmium, lead, zinc, copper) in the soil and in the body of insects was studied using an inversion volt-amperometric method of analysis (SWV) and spectrometric analysis using ICP 730-ES. Samples for analysis were selected at the Malinki biological station (on the border of the Podolsky and Narofominsky districts of the Moscow region) and at the Pavlovskaya Sloboda agrobiological station (located in the Istrinsky district of the Moscow region). Studies have allowed us to provide an environmental assessment of the composition of the soil and the content of heavy metals in the body of insects. According to the degree of contamination of the organism of insects of the Chrysomelidae family (leaf beetle) and the Carabidae family (ground beetles), the studied metals can be arranged in a series of zinc > lead > copper > cadmium, which practically coincides with a number of pollution of the studied soils by these metals.
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