Content Of Harmful Substances Research Articles

Requirements for the content of harmful substances in market products of plastics and rubber. Part V. Vehicles and their equipment

This article continues the review of applicable regulations on the safety of products placed on the European Union (EU) market. Part V regarding the regulations on the control of hazardous substances in vehicles, including their components and equipment made of plastics and rubber, covers EU regulations and national acts adapting Polish law to EU legislation in this area.

Experiments on thermal neutralization of marine oily waters

During the operation of the ship's power plant, the formation of oily waters is inevitable. Numerous methods and technologies used on ships do not always ensure the purification of oily waters to the amount of oil content regulated by national and international standards and requirements. In this regard, the development of a new type of installations that allow for the complete purification of oily waters from petroleum products, as well as to reduce their energy and weight and size indicators is relevant. The article presents the first results of experimental studies of the method of thermal neutralization of oily waters, consisting in their spraying in the gas outlet tract of a marine diesel engine, followed by evaporation of water and afterburning of petroleum products from the composition of oily waters with exhaust diesel gases. The research was carried out on a specially designed laboratory stand. The burner of the stand allows to obtain exhaust gases identical in composition and temperature to the exhaust gases in the flue of a marine diesel engine. A gas or liquid medium can be supplied to the flue through the nozzle. Within the framework of the described research period, the influence of the flow rate and composition of the medium supplied to the flue on the temperature at various points of the flue and the resulting composition of the exhaust gases were evaluated. The main task of this stage of the study is to determine the effect of the flow rate and composition of the medium supplied to the flue on the compliance of the gas parameters at the outlet of the installation with the standards for the content of harmful substances in the exhaust gases of marine diesel engines.

The 14-3-3 protein nt GF14e interacts with CIPK2 and increases low potassium stress in tobacco

ABSTRACT Potassium (K+) plays a role in enzyme activation, membrane transport, and osmotic regulation processes. An increase in potassium content can significantly improve the elasticity and combustibility of tobacco and reduce the content of harmful substances. Here, we report that the expression analysis of Nt GF14e, a 14-3-3 gene, increased markedly after low-potassium treatment (LK). Then, chlorophyll content, POD activity and potassium content, were significantly increased in overexpression of Nt GF14e transgenic tobacco lines compared with those in the wild type plants. The net K+ efflux rates were severely lower in the transgenic plants than in the wild type under LK stress. Furthermore, transcriptome analysis identified 5708 upregulated genes and 2787 downregulated genes between Nt GF14e overexpressing transgenic tobacco plants. The expression levels of some potassium-related genes were increased, such as CBL-interacting protein kinase 2 (CIPK2), Nt CIPK23, Nt CIPK25, H+-ATPase isoform 2 a (AHA2a), Nt AHA4a, Stelar K+ outward rectifier 1(SKOR1), and high affinity K+ transporter 5 (HAK5). The result of yeast two-hybrid and luciferase complementation imaging experiments suggested Nt GF14e could interact with CIPK2. Overall, these findings indicate that NtGF14e plays a vital roles in improving tobacco LK tolerance and enhancing potassium nutrition signaling pathways in tobacco plants.

Nitrogen Removal Mechanism and Microbial Community Changes of the MBR Bioaugmented with Two Novel Fungi Pichia kudriavzevii N7 and Candida tropicalis N9

Ammonia nitrogen wastewater causes dissolved oxygen concentrations to decrease and the content of harmful substances to increase. To characterize the application properties of two novel strains of highly efficient ammonium transforming fungi—Pichia kudriavzevii N7 and Candida tropicalis N9—this study used both as compound microbial agents to treat nitrogenous wastewater. Here, we investigated the bioaugmentation effect of compound fungi N7 and N9 in the MBR bioreactor and the effect of N7 and N9 on the fungal and bacterial microbial communities in the system. The results revealed that in the first week after inoculation of N7 and N9, the average removal rate of ammonium in the experimental and control groups were 89.43% and 82.86%, respectively, and the NO3−-N accumulation concentrations were 12.56 mg·L−1 and 17.73 mg·L−1, respectively. The average transformation rate of total nitrogen in the experimental and control groups were 46.32% and 30.6%, respectively. ITS sequencing results indicated that N9 could be a dominant fungus in the complex MBR system. The results of 16S rRNA sequencing showed that the dominant bacterial communities in the system were changed by the inoculation of compound fungi. Therefore, the compound fungi can be applied to strengthen the treatment of nitrogenous wastewater due to its compatibility.

Імовірнісні моделі подання знань для підтримки прийняття рішень в умовах ризику та невизначеності на прикладі галузі охорони атмосферного повітря

In order to systematize and integrate the acquired experience necessary for decision-making in conditions of war and man-made danger, as well as for the purpose of controlling emissions of greenhouse gases or other harmful substances, knowledge presentation models have been de-veloped that take into account both the results of the analysis of available data and probabilistic assessments of the state safety of man-made enterprises and adjacent territories. In order to im-prove the decision-making process, a number of probabilistic models are considered, which are based on the calculation of subjective probability estimates regarding the occurrence of danger-ous events and forecasting the corresponding risks. Factors of various nature are considered during modeling: external influences, concentrations of harmful substances, greenhouse gas emissions, indicators of the state of safety of man-made productions, efficiency of equipment, accounting of violations, and other indicators. Also, the knowledge system provides for calcu-lating the risks of dangerous events, the probability of which increases under the interaction of two or a number of hazardous factors. On the basis of the conducted research, an algorithm for building and the structure of a probabilistic model of knowledge focused on software implementation in the decision-making support system for managing the safety of man-made enterprises that pose threats to the popula-tion and the natural environment has been developed.

Research on the distribution of harmful substances in automotive products based on chemical quantitative

At present, China's automotive industry lacks standardized standards and testing methods for conducting harmful substance testing and evaluation of products.This article finely disassembled a passenger car model and conducted detection and analysis of harmful substances. More than 320000 materials were tested, involving 85 assembly components. This article studies six harmful substances in automotive materials, including lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated biphenyl ethers. The content of harmful substances and their distribution in different materials and components are analyzed. This article provides technical reference for conducting hazardous substance assessments in the automotive industry through data analysis. The harmful substance mainly contained in the studied automotive product is lead, which is mainly distributed in materials such as copper alloys, aluminum, steel, solder, plastics, etc. The content of mercury, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated biphenyl ethers in automobiles is generally low.

Modelling the Spatial Distribution of Industrial Facilities and Green Areas to Reduce the Ecological Footprint

The work solves conjugated problems of a stationary and non-stationary nature for the processes of transfer and diffusion of harmful substances into the atmosphere emitted by industrial facilities to protect the ecology and environment from man-made factors. When mathematically modelling mass transfer in air, absorption coefficients were considered depending on climatic conditions and external disturbances, as well as adhesion coefficients of aerosol particles with vegetation and other weather and climatic factors. Analytical solutions and dual functionality were obtained, and solutions have been developed to optimize the location of industrial facilities in the region from the perspective of economic development and environmental protection. Numerical calculations have shown that the efficiency of particle capture by vegetation is a key factor depending on the type and size of vegetation and varying throughout the year. Experiments have confirmed that the concentration of harmful substances in the ground layer of the atmosphere decreases with increasing coefficients of absorption and capture of particles by vegetation. Computational experiments carried out on a computer have established that with an increase in the diffusion coefficient, the zone of distribution of pollutants expands.

ДИНАМИКА КОНЦЕНТРАЦИЙ РАСТВОРЕННЫХ ФОРМ ТЯЖЕЛЫХ МЕТАЛЛОВ В ВОДЕ РЕКИ МОСКВЫ ПО ДАННЫМ МОНИТОРИНГОВЫХ ИССЛЕДОВАНИЙ В 2021-2023 ГОДА

Background. The Moskva River is a prime example of a natural urban watercourse subjected to strong and varied anthropogenic pressure. For many years, this river has been characterized by increased content of heavy metals. The exceedance of the maximum allowable concentrations of harmful substances in the waters of water bodies used for fishery can result in disruption of the normal functioning of aquatic ecosystems. Relevance. The summarized data collected over the course of monitoring surveys of the Moskva River for three years will be indicative of the relative contribution of natural and anthropogenic sources into its pollution. The aim of this work is to identify the dynamics of spatial and temporal distribution of heavy metals in the Moskva River water and its relation to hydrological seasons, as well as to assess the anthropogenic pressure exerted by the city of Moscow on the river. Methods. Water samples were collected in 2021-2023 during four hydrological seasons. Identification of heavy metals in the collected samples has been carried out using the atomic absorption method. Results. The analysis of the content of dissolved heavy metals (iron, cadmium, cobalt, manganese, copper, nickel, lead, and chrome) in the Moskva River water in various seasons of 2021-2023 has been conducted, and the same was done for zinc in 2023. The dynamics of the spatial and temporal distribution of these heavy metals has been identified, as well as its dependence on the hydrological phases. The influence of the urban infrastructure on the composition of the Moskva River water has been elucidated. Within the investigated area, the exceedance of the values prescribed by the water quality standards for the water bodies used for fishery (MACfish) has been recorded. Conclusion. The waters of the Moskva River have been characterized as polluted, mainly with iron, manganese, copper, and zinc. For lead, chrome, cobalt, nickel, and cadmium, no exceedance of the MACfish has been recorded. It has been found that the majority of the investigated elements were exceeding the values prescribed by the established standards in the spring season, but their concentrations decreased in summer.

Техніко-економічні передумови доцільності створення в Україні виробництва синтетичного моторного палива

The article formulates the main scenarios for organizing the supply of motor fuel to Ukraine. It is shown that a significant reduction in imports of motor fuel in the post-war period is possible only through the restoration and development of oil production and refining with the simultaneous search for options for organizing the production of synthetic motor fuel from non-oil raw materials. The article compares the technical characteristics of a full-cycle oil refinery and a plant producing synthetic motor fuels from coal. It is shown that in the USA and Western Europe, the depth of oil refining is 90-95 %. In Ukraine, these figures were much lower - only 72.1 %. In addition, the European Union's environmental standards governing the content of harmful substances in exhaust gases from cars and specialized machinery are becoming stricter, which should stimulate the development of oil refining and transport engineering technologies. When synthetic motor fuels are produced, the degree of carbon conversion of the original fossil coal into the target light products is 56.0 %, which is objectively less than the depth of oil refining. Under such conditions, the main advantages of obtaining synthetic motor fuels from coal compared to oil refining for the conditions of our country are: reduction of import dependence of the country's economy; sulphur content in the products obtained meets the requirements of modern European standards; the depth of processing of synthetic products reaches 90 % and more with the use of relatively simple equipment; favorable technological properties of synthetic oil determine its price on the world market by about 30 % higher than the best light oil ‘brent’; the obtaining of a by-products of increased demand (light hydrocarbons, thermal and electrical energy); the possibility of obtaining synthetic base oils. Keywords: fossil coal, motor fuel, synthetic fuel, oil refining, refining depth, Nelson index. Corresponding author: I.V. Shulga, e-mail: ko@ukhin.org.ua

Impact of transportation on the environmental friendliness of agricultural food products

This article examines the impact of transportation on the sustainability of agricultural food products. To identify the impact of the transportation process on food quality, this study analyzed the content of harmful substances (nitrates) in several batches of potato fruits before and after the transportation process from the place of harvest to the place of storage. The measurements were carried out using an ecotester – a nitrate meter. The measurement was carried out in three batches of potato fruits collected from different agricultural fields. The results obtained allow us to assess the level of influence of transportation on the environmental friendliness of potato fruits. The results of the study are relevant for further research in the field of improving the quality and environmental friendliness of food products, including through optimization of their transportation processes, and can also be used in conducting broader research in the field of agriculture and ecology.

Использование комплексных органических удобрений при возделывании зерновых культур

In order to determine the effectiveness of the use of soils, laboratory studies were carried out in a mixture with various local agricultural ores, meliorants and waste from agricultural and industrial production, including microorganisms, macro- and microelements. The work was carried out as part of the implementation of a comprehensive project to create high-tech production, provided for by the Decree of the Government of the Russian Federation No. 218 dated April 9, 2010 on the topic "High-tech production of soils by innovative waste processing methods" (state contract identifier 000000S407521QL90002). In the introduction, the requirements for soils on the content of harmful substances are given. The research methodology contains objects, schemes of experiments, the place and conditions of their conduct. The results provide a detailed analysis of laboratory studies conducted with spring wheat and barley, with the reduction of biomorphometric indicators. The illustrations show the growth and development of the vegetative mass of plants. The conclusions reflect the results of the data obtained. The analysis of the average indicators of the two studied crops allowed us to identify 9 options for the subsequent selection of optimal components and ratios: Soil 75%+25 KOU%+defecate, Soil 75%+25 KOU%+phosphogypsum, Soil 75%+25 KOU%, Soil 50%+50 KOU%+phosphogypsum, Soil 50%+50 KOU %+zeolite, Soil 75%+25 KOU%+zeolite, Soil 75%+25 KOU%+ NPK, Soil 50%+50 KOU%+ NPK, Soil 50%+50 KOU%+defecate. Keywords: SOIL, COMPLEX ORGANIC FERTILIZER, BARLEY, WHEAT, MELIORANT, ZEOLITE, PHOSPHOGYPSUM, MYCORRHIZA, PLANT HEIGHT, PLANT MASS

Promotion of Ca2+ Accumulation in Roots by Exogenous Brassinosteroids as a Key Mechanism for Their Enhancement of Plant Salt Tolerance: A Meta-Analysis and Systematic Review.

Brassinosteroids (BRs), the sixth major phytohormone, can regulate plant salt tolerance. Many studies have been conducted to investigate the effects of BRs on plant salt tolerance, generating a large amount of research data. However, a meta-analysis on regulating plant salt tolerance by BRs has not been reported. Therefore, this study conducted a meta-analysis of 132 studies to elucidate the most critical physiological mechanisms by which BRs regulate salt tolerance in plants from a higher dimension and analyze the best ways to apply BRs. The results showed that exogenous BRs significantly increased germination, plant height, root length, and biomass (total dry weight was the largest) of plants under salt stress. There was no significant difference between seed soaking and foliar spraying. However, the medium method (germination stage) and stem application (seedling stage) may be more effective in improving plant salt tolerance. BRs only inhibit germination in Solanaceae. BRs (2 μM), seed soaking for 12 h, and simultaneous treatment with salt stress had the highest germination rate. At the seedling stage, the activity of Brassinolide (C28H48O6) was higher than that of Homobrassinolide (C29H50O6), and post-treatment, BRs (0.02 μM) was the best solution. BRs are unsuitable for use in the germination stage when Sodium chloride is below 100 mM, and the effect is also weakest in the seedling stage. Exogenous BRs promoted photosynthesis, and antioxidant enzyme activity increased the accumulation of osmoregulatory and antioxidant substances and reduced the content of harmful substances and Na+, thus reducing cell damage and improving plant salt tolerance. BRs induced the most soluble protein, chlorophyll a, stomatal conductance, net photosynthetic rate, Glutathione peroxidase, and root-Ca2+, with BRs causing Ca2+ signals in roots probably constituting the most important reason for improving salt tolerance. BRs first promoted the accumulation of Ca2+ in roots, which increased the content of the above vital substances and enzyme activities through the Ca2+ signaling pathway, improving plant salt tolerance.

Environmental approach to ensuring the security of modern enterprises

The development of integration processes and globalization requires an increase in enterprises' level of security. It becomes a necessary condition for their functioning. Issues related to the environmental and economic security of enterprises become relevant in modern conditions of rapid development of production and foreign economic relations and require further research not only at the level of the country but also at the level of regions and enterprises. Therefore, for enterprises, an essential point in their work is ensuring environmental safety without negatively impacting economic safety. Ensuring the enterprise's economic security is always important because it determines its ability to be stable on the market and flexible. Suppose the enterprise needs to pay attention to measures to counter environmental threats. In that case, it may lead to significant financial losses and even stop work. It is emphasized that the ecological component of the enterprise's economic security must guarantee the society's safety from business entities carrying out industrial and commercial activities. For this purpose, the manufacturer must carefully comply with the national norms of the minimum permissible content of harmful substances entering the environment and the ecological parameters of the manufactured products. It has been proven that enterprises' effective use of natural resources will contribute to producing quality products, increase competitiveness, and, most importantly, be environmentally safe for people's health. It is noted that an essential problem in ensuring control over the management system of the ecological component of safety is the reliability of the reported data of the enterprises' users of natural resources. It emphasized the need to introduce stricter requirements for environmental reporting by enterprises, which should lead to strict compliance with the norms and requirements of legislation in the field of ecology and, therefore, increase the environmental and economic security of the enterprise. Enterprise management is built on a balanced solution to environmental and economic problems, finding the optimal relationship between ensuring environmental safety and the expediency of enterprise activity. Keywords: ecological component, enterprise, safety, environmental economy, resources.

Pollutants production, energy recovery and environmental impact of sewage sludge co-incineration with biomass pellets

This study describes the production of pollutants, energy recovery and environmental impact of the co-incineration of sewage sludge and biomass pellets. The main objective of this study is to describe the use of energy generated by co-incineration and to assess the environmental impact of emitted pollutants. Co-incineration takes place in five different blended. The combustion takes place in a fluidised bed reactor with an average combustion temperature of 915–939 °C. The combustion process is mapped by Fourier transform infrared spectroscopy, Continuous Mercury Monitoring Systems, thermocouples, pressures, and flows sensors. The results show that the concentrations of harmful substances, namely SO2 and NOX, reach values of 12.39–1730.33 mg∙m–3N for SO2 and 93.30–1156 mg∙m–3N for NOX. This means that the emission limits are exceeded 40 times for SO2 and 8 times for NOX in the worst case. Regarding heat recovery, the resulting value of potential energy recovery from the flue gas is 5.35–7.69 MJ∙kg–1, and as the sewage sludge content in the fuel increases, the heat recovery value decreases. The resulting values of pollutant concentrations are also analyzed using a life cycle assessment approach using the GaBi software. The results show that sewage sludge incineration has the greatest impact on climate change, terrestrial ecotoxicity, and human toxicity. Again, as the sewage sludge content in the fuel decreases, the hazardousness of the discharged flue gas decreases. This study presents a relatively promising option to use sewage sludge as a secondary fuel in large combustion sources under certain conditions.

Requirements for the content of harmful substances in market products of plastics and rubber. Part IV. Toys

The article is a continuation of the existing legal acts review on the safety of products placed on the European Union (EU) market. The review, in part IV concerning the provisions on the control of hazardous substances in toys, covers both EU legal acts and national acts transposing EU regulations into Polish law in this regard.

Экологические аспекты при утилизации отработанных охлаждающих жидкостей

Purpose: To consider the issue of the state of the problem of collection, disposal and impact of used coolants on the environment, primarily from road transport. To show the need for recycling of spent cooling liquids, the search for new compositions of cooling liquids and the intensification of the collection of spent antifreeze from the population. Methods: Comparing the characteristics of main coolants, highlighting their advantages and drawbacks on the stage of efficiency reduction. Analysis of the types of contaminants accumulating in spent antifreeze. Comparison of advantages and disadvantages of typical methods for purifying spent coolants. Analysis of the growth of sources of anthropogenic impact in the considered area. Results: The most important characteristics of coolants have been established. The most characteristic types of contaminants contained in antifreeze are identified and the most suitable methods of their regeneration are given. The high relevance of the considered problem of the circulation of spent antifreeze as a result of the rapid growth of motorization of the population in the absence of proper control by the state is noted. The necessity of searching for new safe antifreezes while maintaining the target qualities of coolants is revealed. Practical significance: The necessity of revising the attitude to antifreeze in terms of assessing their danger to the environment is shown. The ways of improving the handling of waste coolant solutions in terms of intensifying their collection from enterprises and the public are outlined. It has also been noted that it is necessary to search for new solutions of cooling liquids with a lower content of harmful substances in them to protect humans and the environment.

Research on the Physical and Chemical Characteristics of Dust in Open Pit Coal Mine Crushing Stations and Closed Dust Reduction Methods

As an important link in open-pit mining production, the crushing station produces a large amount of dust during the production process. Dust has the characteristics of a wide spread area, great harm, and difficult governance. Therefore, dust control has become a key issue that needs to be solved in open-pit mining. In this article, we assess results after high-speed cameras and dust concentration detectors are installed around the crushing station to monitor the dust concentration in the surrounding air. It is found that in the air, dust with a particle size of less than 2.5 μm accounts for 67.43%, less than 10 μm accounts for 17.30%, and less than 100 μm accounts for 15.27%. In settled dust on the ground, particles with a particle size of less than 100 μm account for 42.69% of the sample, and particles less than 10 μm account for 16.60% of the sample. Secondly, physical and chemical properties testing is conducted on the dust. XRD test results show that SiO2 in the dust accounts for 65.80%; XRF test results show that the oxide Al2O3 in the dust accounts for up to 46.84%; ICP test results show that the element Al accounts for 42.62% of the total amount of trace elements detected; and Si accounts for 35.11%, clarifying the content of harmful substances to the human body. Finally, Fluent software, Ansys 2020 R1, is used to simulate the diffusion law of dust under different states of the crushing station, including an open state, a closed state, and the installation of a dust removal system. Based on the simulation results and the actual situation on site, the optimal dust reduction method suitable for the crushing station is proposed, and the diffusion law of dust under this method is simulated. The tracked dust shows that the dust removal efficiency of PM2.5 reaches 97.00%, PM10 reaches 99.60%, and TSP reaches 98.30%.

PRODUCTION ENVIRONMENTALLY FRIENDLY DIESEL FUEL BASED ON DEAROMATIZED DIESEL FRACTION AND BUTYL ESTERS OF FATTY ACIDS OF SUNFLOWER OIL

Currently, special attention is paid to the environmental performance of fuels, because, the ever-increasing quantity of transport leads to an increase in the emission of harmful substances into the atmosphere. In particular, for the introduction of environmentally friendly technologies for the production of diesel fuels, first of all, it is necessary to obtain diesel fuel with a low content of sulfur, nitrogen and polycyclic aromatic compounds, which requires the processes of hydrotreating, hydrocracking and hydrodearomatization are carried out, which require significant economic costs. The presented article considers an alternative process for reducing the content of harmful substances, in particular aromatic compounds in the composition of diesel fuel. The process of dearomatization of the diesel fraction was carried out using N-methylpyrrolidone as an extractant at a ratio of extractant : diesel fraction 2:1 for 6 hours. The physicochemical properties of the dearomatized diesel fraction have been studied. In the resulting dearomatized diesel fraction, the sulfur content decreased to 0.0220%, and the content of aromatic compounds to 0%, in addition, the fractional composition is facilitated, the density and viscosity decrease. In order to replenish the resource of diesel fuel, oxygen-containing additives were added to the dearomatized diesel fraction - butyl esters of fatty acids of sunflower oil in an quantity of 5-10%, and the physicochemical properties of the resulting compounds were studied. It was revealed that the addition of butyl esters of fatty acids of sunflower oil to the composition of the dearomatized diesel fraction favorably affects the quality indicators of the obtained compounds. So, there is an increase in the flash point by 6°C and the cetane number by 4-5 points, and the sulfur content decreases to 0.0198%. In addition, the diameter of the wear scar decreases by about 2 times and for a 5% compound it is 0.430 mm, and for a 10% compound it is 0.370 mm, which meets the modern requirements of the standard. Thus, obtaining environmentally friendly diesel fuel is possible by dearomatization of the diesel fraction with the subsequent addition of butyl esters of fatty acids of sunflower oil, which can be recommended as a multifunctional additive to diesel fuels.

Применение дезинфектантов нового поколения в решении современных проблем обеззараживания в водопроводно-канализационном хозяйстве

Purpose: To consider and evaluate alternative methods of water disinfection and disinfection of water supply and sewerage facilities and to select the most effective. To determine the possibility of using several agents at the same time, to select disinfectants with a biodegradable composition, the use of which will help reduce the negative impact on the environment. Methods: Comparison of the composition and effectiveness of existing disinfectants. Results: The necessity of using various combinations of disinfectants to reduce the likelihood of resistance in microorganisms to biocides is indicated. The most promising method for treating structures is the aerosol method, which allows achieving the necessary disinfection effect with small doses of the reagent. The use of multi-component disinfectants (such as the “Silver Bullet” anolyte and biocide) is safe for humans and the environment due to their composition, it also helps prevent microbial habituation to the substances. Practical significance: Due to the conditions of water intake changing for the worse and stricter regulations for the content of harmful substances in drinking water, the use of combined schemes for water disinfection and disinfection of structures has most potetial.

The current ecological and ichthyotoxicological state of the shlis-selburg bay lake Ladoga

The article presents the materials of biological and chemical-analytical studies of the Shlisselburg Bay of Ladoga lake, that plays an important fishery and sanitary-hygienic role as a source of water supply of St. Petersburg. The dominant role of ichthyo-fauna in the assay of the ecological and toxicological state of the studied water area is shown. The purpose of the conducted research is to assess the ecological and ichthyo - toxicological state of the Shlisselburg Bay of Ladoga lake, as one of the main fishery water areal and the only source of water supply of St. Petersburg (the source of the Neva River). Biological and chemical analytical studies of the water area of the Shlisselburg Bay in laboratory conditions were carried out in the summer-autumn period in 2022 in three water areas. A feature of the Shlisselburg Bay is the presence of a runoff flow, that initiates the removal of pollutants and the nature of bottom sediments, which makes the Bay less vulnerable to anthropogenic impact. Currently, the methods used to assess water quality for the fisheries perspective are biological – bioindication and biotesting, as well as the results of chemical analysis in comparison with the standards for the content of harmful substances in water, sediments, precipitation and fish. Preference is given to “express’ methods: biotesting and bioindication of fish research results. Analysis of materials from previous studies have given reason to consider a gradual decrease in anthropogenic load (exposure to pollutants) on fish, as generally recognized indicators of water quality, given from fisheries positions. The results of the research showed that the ecological and toxicological condition of the Shlisselburg Bay has now improved, but cannot be considered satisfactory. Taking into acount the state of the ichthyo fauna and the level of its pollution, it can be characterized as weakly expressed sublethal with a possible transition to medium-expressed, conditionally sublethal in the spring period.