Browsing by Author "Bunduchi, Elena"

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ACADEMICANUL GHEORGHE DUCA – CONTRIBUŢII LA DEZVOLTAREA ŞI CONSOLIDAREA ÎNVĂŢĂMÂNTULUI SUPERIOR CHIMIC ŞI DE PROTECŢIE A MEDIULUI AMBIANT LA UNIVERSITATEA DE STAT DIN MOLDOVA
(CEP USM, 2022) Bunduchi, Elena
ANALIZA DINAMICII MULTIANUALE A COMPOZIŢIEI IONICE A APELOR FLUVIULUI NISTRU
(CEP USM, 2011) Goreaceva, Nelli; Gladchi, Viorica; Bunduchi, Elena; Şurîghina, Olga; Romanciuc, Lidia
The present article contains the analysis of the long-term and annual variability of the water content of the Moldovan Middle region of Dniester, performed on the results of annual hydro chemical surveys of 2003-2010.
ASSESSMENT OF KINETIC PARAME TERS IN THE WATERS OF THE NISTRU COURSE IN THE SECT ION NASLAVCEA – DUBASARI
(Academia de Știinițe a Moldovei, 2006) Bunduchi, Elena; Duca, Gheorghe; Gladchi, Viorica; Goreaceva, Nelli; Mardari, Igor
The current work represents the results of a monitoring executed on Nistru River waters between October 2003 and September 2005. The water quality was valuated on the basis of such kinetic indicators as redox state and capacity of inhibition. The obtained results shows that Nistru River water in the segment Naslavcea village – Dubasari barrage are continuously polluted with reducing substances that diminish the H2O2 content, that actually determines the redox state of natural waters and the content of free radicals
ASSESSMENT OF KINETIC PARAMETERS IN THE WATERS OF THE NISTRU COURSE IN THE SECTION NASLAVCEA – DUBASARI
(2006) Bunduchi, Elena; Duca, Gheorghe; Gladchi, Viorica; Goreaceva, Nelli; Mardari, Igor
The current work represents the results of a monitoring executed on Nistru River waters between October 2003 and September 2005. The water quality was evaluated on the basis of such kinetic indicators as redox state and capacity of inhibition. The obtained results shows that Nistru River water in the segment Naslavcea village – Dubasari barrage are continuously polluted with reducing substances that diminish the H2O2 content, that actually determines the redox state of natural waters and the content of free radicals
ASSESSMENT OF THE SELF-PURIFICATION CAPACITY OF VALEA MORILOR’S LAKE
(Academia de Ştiinţe a Moldovei, 2017) Bunduchi, Elena; Goreaceva, Nelly; Lutenco, Maria
THE BUFFERING CAPACITY OF THE WATERS OF SOME LAKES FROM CHISINAU
(Academia de Ştiinţe a Moldovei, 2014) Bunduchi, Elena; Gladchi, Viorica; Goreaceva, Nelly
CHEMICAL AUTOPURIFICATION OF ACTIVE BLUE DYE-POLLUTED NATURAL WATER
(Academy of Sciences of Moldova, 2017) Bunduchi, Elena; Gladchi, Viorica; Duca, Gheorghe
CHEMICAL COMPOSITION FROM THE DNIESTER RIVER TRIBUTARIES
(2013) Gladchi, Viorica; Duca, Gheorghe; Goreaceva, Nelli; Bunduchi, Elena; Lis, Angela
This article presents the results obtained in the framework of the project 09.832.08.06A The role of the tributaries on formation of the Dniester river water and the study of the waters quality of sources/fountains in the catchment area of the Dniester river as sources of water supply and for irrigation in the State Program, ScientificResearches and of the management of waters quality.
CHEMICAL COMPOSITION FROM THE DNIESTER RIVER TRIBUTARIES
(2013) Gladchi, Viorica; Duca, Gheorghe; Goreaceva, Nelli; Bunduchi, Elena; Lis, Angela
This article presents the results obtained in the framework of the project 09.832.08.06A The role of the tributaries on formation of the Dniester river water and the study of the waters quality of sources/fountains in the catchment area of the Dniester river as sources of water supply and for irrigation in the State Program, Scientific Researches and of the management of waters quality.
CHIMIA ECOLOGICĂ A APELOR NATURALE ȘI PROCESE DE AUTOPURIFICARE A SISTEMELOR ACVATICE. ISTORIA ȘI DEZVOLTAREA LA UNIVERSITATEA DE STAT DIN MOLDOVA
(CEP USM, 2022) Gladchi, Viorica; Bunduchi, Elena; Blonschi, Vladislav; Romanciuc, Lidia
COMPOZIŢIA CHIMICĂ A APELOR DIN BAZINUL NISTRULUI INFERIOR (ANUL 2015)
(CEP USM, 2016) Gladchi, Viorica; Bunduchi, Elena; Goreaceva, Nelli
COMPOZIŢIA CHIMICĂ ŞI STAREA REDOX A APELOR NISTRULUI MEDIAL
(2008) Gladchi, Viorica; Goreaceva, Nelli; Duca, Gheorghe; Bunduchi, Elena; Borodaev, Ruslan; Mardari, Igor; Romanciuc, Lidia
The result of construction of a hydrochemical system in the section line of the Dniester River at Novodniestrovsk was the achievement of practically total control of the river flow in the Moldovan part. At the same time, this system controls not only the seasonal variation of the level of the river but also forms a new hydrological and hydrochemical regime of the river as a result of the controlled discharge of water through the Novosdniestrovsk barrage. The level of impact of this process on the quality of waters was the main objective of current research. With this purpose during the years 2005-2006 there were performed investigations in the segment of the River starting with buffer reservoir (200 m below the barrage) at Naslavcea and ending with c. Dubasari (100 m below the Dubasari barrage). Water samples were collected in 6 different section lines. The parameters measured included: water temperature, pH, Eh, rH, hydrogen peroxide content, OH radicals content, dissolved oxygen, total amounts of iron, copper, soluble forms of nitrogen compounds, COD, BOD5 and others. A special attention was drawn to the analysis of the redox state of waters, the content of OH radicals and other parameters that were affected by man-made systems or activities. In the frames of the project 8 expeditions were carried out.
Compoziția chimică, procese de poluare și autopurificare a fluviului Nistru în porțiunea barajul Dubăsari (amonte r. Răut) – or. Vadul lui Vodă (amonte r. Ichel). Perioada anilor 2020 – 2022
(Editura USM, 2023) Gladchi, Viorica; Blonschi, Vladislav; Bunduchi, Elena; Lis, Angela
Articolul include rezultatele monitoringului apelor fluviului Nistru în porțiunea barajul de la Dubăsari, amonte vărsare a r. Răut – or. Vadul lui Vodă, aval de vărsare a r. Ichel pe parcursul anilor 2020-2022. Sunt analizate parametrii hidrochiici tradiționali, care reprezintă dinamica macroelementelor, mineralizării și indexul hidrochimic al apelor fluviului. La fel, a fost analizat regimul de oxigen al apelor, variația diferitor forme minerale ale elementelor biogene, precum și gradul de poluare a apelor cu substanțe organice de diferit tip. Rezultatele obținute indică influența apelor afluentului Răut asupra parametrilor hidrochimici al Nistrului în porțiunea monitorizată și un grad avansat de poluare a apelor fluviului cu substanțe organice greu degradabile, care sunt în mare parte de origine antropogenă.
Content of harmful and potentially harmful substances in conventional cigarette smoke and in tobacco heating system TSH 2.2. Comparison of the scientific results of independent research and Philip Morris International
(CEP USM, 2024) Gonța, Maria; Gladchi, Viorica; Bunduchi, Elena
In this paper, the content of harmful and potentially harmful constituents (HPHCs) in conventional cigarette smoke and in the Tobacco Heating system 2.2 (THs 2.2) product, developed by Philip Morris International (PMI) and marketed under the brand name IQOs (I Quit Ordinary smoking), as well as for conventional 3R4F cigarettes, was examined using statistical data obtained from studies of scientifc papers published between 2015 and 2022. Based on the analysis of the results presented by independent and industry-sponsored studies, it was found that the harmful and potentially harmful constituents (HPHC) are not entirely eliminated from the HTP aerosol, so these products are still not without risks for the population. The data obtained for all analyzed chemicals, with the exception of the substance with order number 30, n-nitrosoanabasine, support the theory put out in this study, according to at least one group or multiple groups of independent experts. In other words, in each individual case, at least one group of independent experts attests that the information provided by the company’s experts about the concentrations of the analyzed compounds (at least for the maximum values obtained) in the aerosol stream emitted by an IQOs device is not diminished.
DINAMICA CALITĂŢII APELOR NISTRULUI DE MIJLOC
(CEP USM, 2011) Gladchi, Viorica; Bunduchi, Elena; Goreaceva, Nelli; Şurhîghina, Olga
This paper analyzes the long-term dynamics of dissolved oxygen, mineral forms of nitrogen and phosphorus, organic matter and kinetic parameters of the Moldovan Middle region of Dniester in the period 2005-2010.
DINAMICA CAPACITĂŢII DE AUTOPURIFICARE A APELOR LACULUI DĂNCENI ÎN PREZENŢA GLUTATIONULUI
(CEP USM, 2021) Bunduchi, Elena; Borodaev, Ruslan; Lis, Angela
ESTIMATION OF THE NATURAL WATER SELF-PURIFICATION CAPACITY FROM THE KINETIC STANDPOINT
(Academia de Știinițe a Moldovei, 2008) Duca, Gheorghe; Bunduchi, Elena; Gladchi, Viorica; Romanciuc, Lidia; Goreaceva, Nelli
The current paper contains a synthesis of the processes of chemical auto-purification that take place in natural waters; examples of mechanisms of such processes occurring with participation of dissolved organic matter, oxidants of the biogeochemical cycle of oxygen and of transition metals including copper and iron are presented. The kinetic indicators of natural water quality are presented as well.
ESTIMATION OF THE NATURAL WATER SELF-PURIFICATION CAPACITY FROM THE KINETIC STANDPOINT
(2008) Duca, Gheorghe; Bunduchi, Elena; Gladchi, Viorica; Romanciuc, Lidia; Goreaceva, Nelli
The current paper contains a synthesis of the processes of chemical auto-puriﬁcation that take place in natural waters; examples of mechanisms of such processes occurring with participation of dissolved organic matter, oxidants of the biogeochemical cycle of oxygen and of transition metals including copper and iron are presented. The kinetic indicators of natural water quality are presented as well.
EVALUAREA CAPACITĂŢII DE AUTOPURIFICARE A APELOR LACULUI DĂNCENI ÎN CONDIŢIILE DE CREŞTERE A CONCENTRAŢIEI DE CISTEINĂ
(CEP USM, 2020) Bunduchi, Elena; Borodaev, Ruslan
Evaluarea capacității sistemului redox de autopurificare a apelor lacului Dănceni la poluarea cu tioli și vitamine
(Editura USM, 2023) Bunduchi, Elena; Borodaev, Ruslan; Gladchi, Viorica; Lis, Angela
Pe exemplul apelor lacului Dănceni și ale unor substanțe din grupul tiolilor (cisteina, glutationul) și a formelor farmaceutice ale vitaminelor din complexul B (B6, B9, B12), în concentrații care modelează situația de poluare în apele naturale, s-au efectuat cercetări pentru a stabili încărcătura de poluant care poate fi acceptată de apele naturale, astfel încât acestea să elimine poluarea și să-și mențină capacitatea de autopurificare. Procesele de autopurificare au fost monitorizate după parametri ca: pHul, gradul de saturație în oxigen, oxidabilitatea permanganatometrică, capacitatea de inhibiție. Cercetările au demonstrat că potențialul de autopurificare al sistemului acvatic natural devine vulnerabil la concentrațiile de tioli de ordinul ≥ 0.8·10-4 M, iar în cazul vitaminelor aceste concentrații constituie factori declanşatori ai situaţiei de „redoxtoxicitate” ireversibile în sistemele acvatice naturale.