This article deals with the impact of chemicals on the degree of recycle water purification, the physical and chemical coagulation process is described and the results of tests that show the effectiveness of these reagents are presented.

This article discusses the possibility and practice of Kazakhstani enterprises producing chemical products and raw materials, which are oriented to export regulations REACH, adopted by the European Union that will greatly increase the safety and competitiveness of domestic production.

This article considers chemical safety as a system of measures aimed at protecting vital human interests against adverse chemical effect from threats of processing, storing and destroying hazardous chemicals. Chemical safety is ensured by a complex of legal, organizational, financial, material and informational measures intended for prevention and elimination of real and potential security risk, mitigation of their consequences.

The article discusses the biotechnological aspects of the use of medusomycete as a producer of chemicals in cosmetology. Organoleptic and chemical studies of a tea drink using various growth substrates were performed.

Main problem: Presence of acidic chemicals such as carbon dioxide and hydrogen sulphide, composition of production fluids triggers corrosion. Corrosion in oil and gas industry leads to deterioration of equipment since most of equipment is made of metal alloys. Application of inhibitors is one of the corrosion mitigation methods that needs to be controlled because it is important to identify optimal concentration of the chemicals in production fluids.Residual chemical analysis plays an important rolein identifying the appropriate dosage of corrosion inhibitors and its correction. It is imperative to find the most optimal concentration of amines due to the fact that both overdose and underdose could lead to equipment deterioration. The chemical analysis is hindered by complexity of mixtures that are applied in petroleum industry. Purpose: The main purpose of this article is to find out the most effective method of residual chemical analysis for inhibitors used against sweet and sour corrosion by studying and analyzing corresponding literature review. The analysis should be carried out with robust, sensitive, and accurate instrumentation. Methods :Theoretical study of composition and mechanism of amines used in oil and gas industry as corrosion inhibitors and selection of appropriate instrumental analytical techniques for the residual analysis. Results and their importance: After careful studying and consideration of modern instrumental analytical techniques the most optimal and efficient method in terms of robustness, time saving and cost was selected. Ion chromatography is an adequate method to carry out residual chemical analysis for amines that are used as inhibitors in oil and gas industry to prevent sweet and sour corrosion.

Today, there is a full development of the food industry. It is characterized by the widest mechanization and automation of production and transport processes, the use of artificial cold and vacuum technology, the latest physical methods, chemical and biological preparations to accelerate technological processes. There are a huge variety of new products. New ways of long-term preservation of products in hermetic airtight packaging are promising. Now it is possible to deliver products from almost any industry to anywhere in the world. But the main problem for the modern consumer is that today's food industry is moving by leaps and bounds in the application and addition of chemical food additives: preservatives, flavors, dyes, stabilizers, antioxidants and substitutes for raw materials. To correctly answer the question of how to treat the use of food with food additives, it is necessary to understand and weigh the main disadvantages and advantages of using them. Advantages are that the product is better preserved, has an attractive appearance. Disadvantages are that the human body wears out, processing various chemicals, it is harmful to health. And with certain doses of use it becomes dangerous. Everyone has their own attitude to their health and their own priorities in life. Many people have come to terms with the daily use of products with additives, but others consciously refuse almost everything in the store. But the fact that no one wants to be poisoned from an overdose of various chemicals or starve to death. Therefore, the main advice is to carefully study the composition indicated on the label of food products and know the measure of their consumption. It is also impossible to believe blindly that the label was written with the truth. Manufacturers often use additives literally visually, which can lead to the production of a product with a dangerously higher concentration. It also happens that the manufacturer intentionally exceeds the norm in order to hide the shortcomings of the product (stale, poor quality of raw materials) and increase the yield of the finished product. The food additives added to many foods (usually designated by the code E) are predominantly harmful to the body. With moderate consumption, the use of products with E-supplements is not too harmful to the body (for example, several times a month). The situation is dangerous when a person consumes products with a large number of food additives daily or even several times a day when using various products. Nowadays, there are several hundred food additives with the code E (from E100 to E1521).

The main problem: The rheological properties of calcium salts are of theoretical and practical interest for a modern researcher. The theoretical interest is primarily related to the search for general patterns and manifestations of the rheological properties of solutions of calcium salts. The practical component is based on the search for patterns and dependencies of the properties of solutions on the structure and composition of the object of study. Such chemicals as calcium salts are of particular practical interest, they are widely used in various fields, such as the food, chemical and pharmacological industries. Hydrophilic high-molecular solutions of alginates, namely calcium alginate, are actively used in the preparation of soft dosage forms, the manufacture of jelly masses in confectionery, act as thickeners in the food industry. They are characterized by a fairly high percentage of viscosity at low concentrations, bioavailability, prolonging effect, absence of irritating properties, biocompatibility with many polymers, which is especially important in the pharmaceutical industry and medicine. The use of calcium salts for these purposes is currently very promising, since these organic salts have a number of unique properties associated with gelation. Purpose: This paper contains the results of studying the features of the rheology of calcium alginate solutions. A concentration range of 0.1-0.7 % was chosen for the studies, which is sufficient to avoid gelation at room temperature. The dependence of viscosity on concentration, temperature (in the range of 25-45 °C) and shear rate were studied. Methods: Analysis of theoretical sources, observation, comparison of results. The rheological characteristics of the obtained substances were studied using a capillary viscometer. The measurements were carried out in the temperature range of 25-45°C. Results and their significance: it was found that there is a significant dependence of viscosity on concentration and temperature. For concentrations of 0.3 – 0.7 %, a similar type of dependence is observed, in contrast to solutions with a concentration of 0.1 % . Explanations of these dependencies were proposed.

Main problem: The article analyzes water quality assurance as the main goal of preserving human health. The study of chemical and microbiological parameters of wastewater and drinking water was carried out using generally accepted standards. The number of deaths associated with the use of contaminated drinking water, according to WHO, tripled in 2021 and reached almost 19 thousand against 6 thousand in 2020. In addition, the number of neoplasms, diseases of the genitourinary system, digestive organs and skin increased by 2 %, to 1.486 million. The reasons for the increase in the level of harmful chemicals and microbiological pollutants in the water are outdated sewage treatment plants, old pipes and disinfection with chlorine. Purpose: Study of the quality of wastewater and drinking water in Pavlodar, study of the quality of wastewater and drinking water in Pavlodar. Methods: Sampling of wastewater, chemical and bacteriological analysis of wastewater and drinking water, statistical method, correlation analysis of experimentally obtained results and calculated characteristics, etc. Results and their significance: In the field of public health risk, pollution of reservoirs that are sources of household drinking water supply and recreational water use, the continuing necessary high deterioration of water supply networks, their accident rate, as a result of low level of operation, failures in the operation of treatment facilities. Hygienic assessment of reservoirs according to complex indicators indicates the continuing high degree of water pollution in places of water use. The water quality indicators of the surface reservoirs of the region remain low in terms of sanitary and chemical (primarily organoleptic and general sanitary), as well as microbiological indicators. According to toxicological indicators, the level of water pollution in places of water use is estimated as moderate. The main pollutants of the Irtysh River in Pavlodar are industrial enterprises and housing and communal facilities that discharge untreated or insufficiently treated wastewater into reservoirs. A complex of causes of drinking water pollution has been identified: high deterioration of water supply networks, their accident rate, because of a low level of operation, failures in the operation of treatment facilities, unfair treatment of industrial wastewater by industrial enterprises of Pavlodar, etc. Priority preventive directions for improving the quality of water as a source of life are the implementation of long-term targeted planning of measures for the modernization of water supply and sewerage networks and facilities in Pavlodar. The state of water supply necessary and measures to improve it should be constantly monitored and considered at meetings of sanitary and anti-epidemic commissions.