Influence of nanoparticles on soil microflora
by D.G. Churilov; G.I. Churilov; V.V. Churilova; S.D. Polischuk; S.N. Borychev; N.V. Byshov
International Journal of Nanotechnology (IJNT), Vol. 18, No. 9/10, 2021

Abstract: For the first time, the effect of nanoparticles of different sizes and physical-chemical parameters on the biological activity of soil and microorganisms that respond to environmental changes has been comprehensively studied. The soil microbial community is very sensitive to environmental changes. First of all, changes in the number of microorganisms occur. It leads to some violation of the natural balance of the microbial community of the soil. The method for determining the degree of toxicity of various media for microorganisms allows to take into account the effect of chemicals, in particular nanoparticles, on microorganisms. Nanoparticles (NPs) of metals have almost no effect on bacterial populations. The response to NPs of copper oxides and zinc is highly dependent on the concentration introduced into the soil. Low concentrations of oxides can stimulate the survival of bacteria that use resistance mechanisms allowing them to grow. At high concentrations of oxides NP, the relative abundance of bacteria decreases. The reactivity of NPs in natural conditions depends on both the type of soil and the size of nanoparticles, in the range of 20 nm (depending on the type of soil and physicochemical characteristics). NPs are much more reactive and reduce the survival of microorganisms. The metal content in the soil practically did not change when treating plant seeds with nanoparticles before planting, regardless of their species, and remained no higher than the control and the MPC (permissible concentration of gross content). This is typical for low-frequency metals and oxides with a concentration of up to 1000 g/ton, size up to 100 nm.

Online publication date: Wed, 13-Oct-2021

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