Abstract
Determination of permissible concentrations of pollutants in relation to water bodies and water quality is the basis for further measures to form technological approaches to water treatment and wastewater treatment, to determine the standards of permissible exposure and technological indicators. The main standard, which is the basis for such calculations - the maximum permissible concentration (MPC) of pollutants or the approximate safe level of exposure (S), are threshold (deterministic) values. It is assumed that the establishment, for example, of the MPC for fisheries water bodies is based on the analysis of toxicological indicators. However, in fact, rationing is carried out on the basis of selective toxicological studies [1], which do not provide such determinism. The obtained data characterize only the influence of the selected levels of toxicant concentration on the studied organisms.
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