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Photochemical transformations of some thiol substances and their participation in chemical self-purification processes of natural waters

Author: Blonschi Vladislav
Degree:doctor of chemistry
Speciality: 02.00.20 - Ecological chemistry
Scientific advisers: Viorica Gladchi
doctor, professor, Moldova State University
Gheorghe Duca
doctor habilitat, professor, Moldova State University
Institution: Moldova State University


The thesis was presented on the 28 December, 2021
Approved by NCAA on the 1 March, 2022


Adobe PDF document1.57 Mb / in romanian
Adobe PDF document1.48 Mb / in english


CZU 574.5:544.52:547.367

Adobe PDF document 6.99 Mb / in romanian
152 pages


thiols, cysteine, self-purification, photolysis, redox status, inhibitory capacity, mercaptide, monitoring, spirulina, toxicity


Thesis structure: introduction, six chapters, general conclusions and recommendations, bibliography of 125 titles, 9 annexes, 117 pages of basic text, 65 figures, 24 tables. The results obtained are published in 15 of scientific papers.

The aim of the paper: consists in evaluating the contribution of thiols in the processes of chemical self-purification of aquatic systems, by establishing the legitimacy of photochemical transformation of thiols.

The objectives of the research: to establish the legitimacy of photochemical, redox and radical transformation of cysteine on model systems; monitoring the content of thiol compounds and hydrochemical parameters in the water bodies in the Dniester river basin; conducting bioassays using cysteine and glutathione, to establish their influence on the biological activity of hydrobionts.

Scientific novelty and originality: it consists in the study of photochemical transformations of cysteine and its influence on the redox state of water. Extrapolation of the legalities on model systems to the real systems, having as reference the database obtained following the monitoring of the thiol compounds in some surface waters. The result obtained that contributes to solving an important scientific problem consists in the scientific reconceptualization about the place and role of native thiol compounds in natural waters, which led to the complex study of their influence on chemical self-purification capacity, especially photochemically. allowed to determine the influence of thiols on the formation of the redox state of natural surface waters.

Theoretical significance: of the research paper consists in complementing the fundamental knowledge in the field of ecological chemistry about the influence of thiol compounds on chemical self-purification processes.

Applicative value: of the research results aim at their use in the ecochemical study of natural surface waters, the possibility of detecting pollution with biodegradable substances of a protein nature.

Implementation of scientific results: the results obtained can be used by institutions specializing in ecological chemistry and environmental protection for monitoring surface water in the country, as well as in assessing the level of pollution of aquatic objects.