The relevance of the problem under consideration is due to the need for hardware to cover a wide range in the determination of heavy metals in food. One of the primary and important tasks remains to ensure control of the quantitative content of lead, the introduction and application of fast and reliable methods of their research. The analysis of the data obtained shows that all the results on the study of wheat bread for the content of lead, obtained by stripping voltammetry and atomic absorption spectrometry for the assessment of precision and operational control of the error using the method of additions are satisfactory. The obtained monitoring results indicate that in the range of less than 0.01 mg of lead per 1 kg of wheat bread prevail (75.6%) over other ranges. The least registered sample results are (2.2%) with the range of obtained data: 0.1-1.0 mg/kg.

Proteins are one of the most important indicators of blood. More than 150 individual whey proteins are currently known. However, an idea of the protein spectrum of blood can also be obtained on the basis of the concentration of total protein, albumin, globulins, the value of the protein coefficient, and the nature of their ratio gives an idea of the direction of protein metabolism (anabolic or catabolic), since the specificity of metabolic processes determines the productivity of layers. The concentration of total protein in the blood of chickens did not depend on the age of the bird, namely the period of the reproductive period, and hence the level of egg production. It fluctuated at the level of 37.2-42.0 g / l. Albumin concentration significantly increased during oviposition from 17.51 ± 1.71 to 21.36 ± 2.09 g / L. At the same time, the percentage of albumin in the total protein concentration increased from 47.07 ± 1.27 (26 weeks of age) to 53.93 ± 1.33% (p≤0.05) (80 weeks of age). The amount of globulins in the blood of hens did not depend on the age and duration of the reproductive period, but had a tendency to decrease, which was the result of a gradual decrease in the defenses of the bird’s body. The resistance of the body of laying hens decreases to the greatest extent at the age of 80 weeks, which causes an increase in Alb / Gl - coefficient by 1.51 times (p≤0.05) compared to the beginning of oviposition. The concentration of urea in the body of hens steadily increased during oviposition from 2.76 ± 0.18 (26 weeks of age) to 4.03 ± 0.11 mmol / L (p≤0.05) (80 weeks of age). The uric acid content in the blood of laying hens did not depend on the age and duration of the reproductive period and varied in the range of 0.39 ± 0.007 - 0.43 ± 0.002 mmol / L.

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The agricultural food industry is currently facing significant challenges. The development of the food industry, biotechnology, chemistry and related sciences has brought a huge number of new substances that can have a negative effect on humans, the level of environmental pollution has increased, which necessitates stricter requirements for food safety. The relevance of the problems of producing organic food, which has recently gone far beyond the boundaries of purely scientific interests, has made them the subject of discussion for various sectors of society. The demand for safe, environmentally friendly and biologically clean, and high-quality food is growing. At the same time, the production of agricultural and food products should be cost-effective. Today, bio-food markets have already formed in the world: these are plant growing products (fruits, vegetables), animal husbandry (dairy products), baby food, and grain. The growth of the cultural level of the population will increase the demand for beef and its processed products. In this regard, the study and search for safe natural components that affect the yield of meat and are able to efficiently convert the energy of food into organic protein are critical. The paper presents the results of studies of beef meat grown using the technology of intensive cultivation using a biostimulator of natural origin. A positive effect of humic natural substances on carcass morphology and beef quality has been proven. An additional reserve to provide an increase in consumer value and production of safe meat raw materials using a natural peat preparation is shown.

A qualitative and quantitative analysis of hydrochemical parameters of water is given in order to identify the factors that determine their spatial and temporal changes in a lake-type reservoir. Water samples were taken in 2019 and 2020 from the average level in spring (April), summer (July) and autumn (September) in the first week of the month in accordance with the requirements of GOST R 51592-2000 in three sections. The first target (1) is the shallow upper part (depth from 2 to 4 m); the second target (2) is the central part (depth from 5 to 7 m) and the third target (3) is the near – dam part (depth up to 12.2 m). Statistical analysis of the obtained data was performed using the unlimited Principal component analysis (PCA) technique and the limited redundancy analysis (RDA) technique. The effects were considered statistically significant at P<0.05, and useful for discussion-at P<0.10. It was found that, despite the flood increase in the level of chemical components in the water of the reservoir, most of them meet the requirements for fishing waters, with the exception of iron, copper, manganese, zinc, nickel and lead, which exceed the MPCVR from 1.1 to 45.0 times. The total variability of the hydrochemical composition of water in the reservoir, estimated by the PCA method, depends on the season of the year by 71.4 %. A similar result was obtained by the RDA method in a model with a single regressor. When all factors are taken into account in the RDA model, the variability of the water chemical composition is affected by the season of the year by 74.3 %, the year of research by 11.1 %, and the location of the target by 1.9 %. The primary indicators of water for the proportion of unexplained variability in both the PCA and RDA methods are manganese, bicarbonates, lead and aluminum, and pH.