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Persistent organic pollutants in the aquatic ecosystems of the Republic of Moldova


Author: Ivanova Anastasia
Degree:doctor of biology
Speciality: 03.00.16 - Ecology
Year:2022
Scientific adviser: Elena Zubcov
doctor habilitat, professor, Institute of Zoology
Institution: Institute of Zoology

Status

The thesis was presented on the 15 April, 2022
Approved by NCAA on the 1 July, 2022

Abstract

Adobe PDF document – 1.75 Mb / in english
Adobe PDF document – 1.81 Mb / in romanian

Thesis

CZU 504.064:574.58(478)(043.2)

Adobe PDF document 4.32 Mb / in romanian
148 pages

Keywords

persistent organic pollutants, aquatic ecosystem, Dniester River, Prut River

Summary

Ivanova Anastasia „Persistent organic pollutants in the aquatic ecosystems of the Republic of Moldova”, PhD thesis in biological sciences, Chisinau, 2022 Structure of the thesis. The thesis consists of introduction, four chapters, conclusions and recommendations, bibliography (290 titles), 59 figures, 10 tables, 8 annexes, 148 pages. The obtained results were published in 13 scientific papers. Keywords: persistent organic pollutants, aquatic ecosystem, Dniester River, Prut River. Field of investigation: 166.01. Ecology. The purpose of the research consists in investigation of persistent organic pollutants and their accumulation processes in some components of the aquatic ecosystems of the Dniester River and the Prut River by implementing modern methods, laboratory techniques and high-performance analytical equipment. Objectives of the thesis: study, testing and implementation of modern analytical methods for the POP determination in the components of aquatic ecosystems according to international standards and methods; determining the dynamics of the content of organochlorine pesticides and other POPs in the waters of transboundary aquatic ecosystems within the limits of the Republic of Moldova; establishing the level of POPs accumulation in the sediments and estimating the ecological quality of the sediments according to the POP content; specifying the methodological aspects regarding the determination of pesticides in fish tissues. Scientific novelty and originality consists of establishing the dynamics of the residue content of Σ4HCH, Σ6DDT, ΣHAP in water, sediments and fish tissues in transboundary aquatic ecosystems; determination of the migration of these substances in time and space being the basis for the development of the theory of the functioning of aquatic ecosystems in the current conditions. For the first time, some legitimacies of accumulation in the sediments of the industrial compounds Σ20BPC and Σ34DEPB were determined and established; the ecological status of the sediments was evaluated according to several ecological guidelines on POPs content. By adjustment, specifying and implementing high-performance techniques and equipment, results were obtained on the level of accumulation of persistent organochlorine pesticides in the muscles of the body, liver and gonads in 2 species of fish. The investigations and the results obtained expand the knowledge regarding the complex monitoring of the functioning of the aquatic ecosystems. The solved scientific problem consists in the scientific argumentation of the migration of POPs in the aquatic ecosystems of the Republic of Moldova, which led to highlight the importance of POPs investigations on the pollution of aquatic components. The theoretical significance. The tested methods, and high-performance equipment implemented in research, approved in Sweden and Moldova allowed to obtain results on accumulation and migration of POPs, including forms of transformation, are theoretical points in the development of ecological science of the functioning of aquatic ecosystems and their complex monitoring. The applicative value of the work. The results of testing POP analysis techniques in the components of aquatic ecosystems contribute to the development of the methodological basis of ecotoxicological studies. The results on the POP content are valuable for estimating surface water quality and the ecological status of sediments. Implementation of scientific results. The results of research on the state of aquatic ecosystems are of interest to the Ministry of Environment and subordinate agencies. They are implemented at the "Dunărea de Jos" University of Galați. The results became part of 2 international projects (BSB27 MONITOX, BSB165 HydroEcoNex) and 1 national project on the State Program 2020-2023 (20.80009.7007.06 AQUABIO).