Izvestiya of Saratov University.
ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)


Химия

ВЛИЯНИЕ ОРГАНИЧЕСКИХ И НЕОРГАНИЧЕСКИХ ВЕЩЕСТВ, СОДЕРЖАЩИХСЯ В ПИТЬЕВОЙ ВОДЕ, НА ЕЕ КАЧЕСТВО И ЗДОРОВЬЕ НАСЕЛЕНИЯ

Вода является одним из ключевых факторов здоровья человека. Качество питьевой воды – глобальная проблема современного человечества. Практически все ее источники подвергаются антропогенному и техногенному воздействию разной интенсивности. Проблема качества питьевой воды актуальна как в глобальном масштабе, так и в рамках отдельно взятого региона или населенного пункта.

Термогравиметрическое исследование содержания фракций воды в крови мышей в условиях острой гипоксии и гиперкапнии и под воздействием антигипрксантов

Гипоксия - широко распространенное явление, возникающее как в условиях дефицита кислорода во внешней среде, так и в результате различных патологий. При изменении внешних условий происходят изменения в соотношении структурных фракций воды и общего содержания воды. Структурное состояние воды зависит от стадии развития адаптационного синдрома. Степень гидратации биополимеров увеличивается на стадии резистентности организма и уменьшается на стадии истощения. Цель исследования - изучить фракции воды в крови под воздействием гипоксии и антигипоксантов.

Electrochemical SERS study of some endogenous components of human biofl uids

The work describes electrochemical (EC) protocol suitable for preparation of copper electrodes which can be used as substrates in surface-enhanced Raman spectroscopy (SERS). These SERS-active electrodes have been used for electrospectral studies based on the combination of electrochemical and SERS analysis (EC-SRS analysis). Several endogenous bodyfl uid components (urea, creatinine, uric acid, bilirubin) have been selected for the study because they can signifi cantly aff ect the SERS-based determination of other analytes in bodyfl uids (for example, drugs).

Phase tree, forecast of crystallizing phases and description of chemical interaction in the system KCl–CaCl2–BaCl2

The construction of a phases tree of a ternary system with three binary compounds KCaCl3 , K2 BaCl4 , CaBaCl4 is given. The phase tree includes four secondary phase triangles CaCl2 –KCaCl3 –СаBaCl4 , CaBaCl4 –KCaCl3 –BaCl2 , KCaCl3 –BaCl2 –K2 BaCl4 and KCaCl3 –CaBaCl4 –KCl. These triangles are connected by three stable secants KCaCl3 –СаBaCl4 , KCaCl3 –BaCl2 , KCaCl3 –K2 BaCl4 . Crystallizing phases in stable and secant elements correspond to the simplex tops.

Photocatalytic water purification from phenol and formaldehyde

Industrial development leads to an increasing number of persistent and highly toxic organic compounds such as phenol and formaldehyde. Chemical oxidation processes (in particular, photooxidation) are widely used for water treatment and wastewater and groundwater treatment. As part of the work done, an assessment of the possibility of using photocatalysis for post-treatment of wastewater from phenol, formaldehyde, and their mixtures has been carried out.

Application of cationic dye pyronin G (Y) for quantitative extraction-photometric determination of higher carboxylic acids in fi sh

The relevance of this study is due to the need to develop methods for the extraction and quantitative determination of higher carboxylic acids in fi sh. In this work, we propose a simple, inexpensive, and highly sensitive extraction-photometric technique for the selective determination of the total content of fatty acids.

Synthesis and some properties of colloidal quantum dots of mercury selenide

The synthesis of colloidal quantum dots of mercury selenide using mercury oxide as a precursor is proposed. The proposed method is characterized by the use of a less toxic component in the reaction mixture - mercury oxide. The transmission electron microscopy method established an average diameter of 5–6 nm and the shape of quantum dots. A histogram of the size distribution of synthesized nanoparticles is presented. An important property of the synthesized nanoparticles is the crystal structure established by X-ray diff raction analysis.

Modern methods of controlled radical polymerization for obtaining branched polymers of acrylamide, acrylic acid and (met)acrylates

 A search and analysis has been carried out of English-language 2005–2020 scientifi c literature devoted to methods of obtaining branched (co)polymers of acrylamide, acrylic acid and (met)acrylates in order to obtain novel materials with valuable properties. It has been found that modern methods of controlled radical polymerization are mainly used for this purpose, namely, atom transfer radical polymerization (ATRP), reversible addition-fragmentation chain transfer polymerization (RAFT) and group transfer polymerization (GTP).

Interaction of 3H-furan-2-ones and 4-oxobutanoic acids with 2-(aminophenyl)methanol

Reactions of 4-oxobutanoic acids as well as their cyclic analogues 3H-furan-2-ones with 1,3-binucleophilic reagent (2-aminophenyl) methanol lead to the formation of 1-R-5H-benzo[d]pyrrolo[2,1-b][1,3]oxazines and 3a-R-2,3,3a-trihydro-5H-benzo[d]pyrrolo[2,1-b][1,3]oxazin1-ones, respectively. Quantum-chemical calculations of the Fukui reactivity indices and local hardness have substantiated the mechanisms of the reactions carried out.

ВЛИЯНИЕ ОРГАНИЧЕСКИХ И НЕОРГАНИЧЕСКИХ ВЕЩЕСТВ, СОДЕРЖАЩИХСЯ В ПИТЬЕВОЙ ВОДЕ, НА ЕЕ КАЧЕСТВО И ЗДОРОВЬЕ НАСЕЛЕНИЯ

Вода является одним из ключевых факторов здоровья человека. Качество питьевой воды – глобальная проблема современного человечества. Практически все ее источники подвергаются антропогенному и техногенному воздействию разной интенсивности. Проблема качества питьевой воды актуальна как в глобальном масштабе, так и в рамках отдельно взятого региона или населенного пункта.

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