Browsing by Author "Goreaceva, Nelli"
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Item ANALIZA DINAMICII MULTIANUALE A COMPOZIŢIEI IONICE A APELOR FLUVIULUI NISTRU(CEP USM, 2011) Goreaceva, Nelli; Gladchi, Viorica; Bunduchi, Elena; Şurîghina, Olga; Romanciuc, LidiaThe 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.Item 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, IgorThe 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 radicalsItem 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, IgorThe 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 radicalsItem CHEMICAL COMPOSITION FROM THE DNIESTER RIVER TRIBUTARIES(2013) Gladchi, Viorica; Duca, Gheorghe; Goreaceva, Nelli; Bunduchi, Elena; Lis, AngelaThis 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.Item CHEMICAL COMPOSITION FROM THE DNIESTER RIVER TRIBUTARIES(2013) Gladchi, Viorica; Duca, Gheorghe; Goreaceva, Nelli; Bunduchi, Elena; Lis, AngelaThis 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.Item COMPOZIŢIA CHIMICĂ A APELOR DIN BAZINUL NISTRULUI INFERIOR (ANUL 2015)(CEP USM, 2016) Gladchi, Viorica; Bunduchi, Elena; Goreaceva, NelliItem COMPOZIŢIA CHIMICĂ ŞI STAREA REDOX A APELOR NISTRULUI MEDIAL(2008) Gladchi, Viorica; Goreaceva, Nelli; Duca, Gheorghe; Bunduchi, Elena; Borodaev, Ruslan; Mardari, Igor; Romanciuc, LidiaThe 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.Item DINAMICA CALITĂŢII APELOR NISTRULUI DE MIJLOC(CEP USM, 2011) Gladchi, Viorica; Bunduchi, Elena; Goreaceva, Nelli; Şurhîghina, OlgaThis 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.Item 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, NelliThe 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.Item ESTIMATION OF THE NATURAL WATER SELF-PURIFICATION CAPACITY FROM THE KINETIC STANDPOINT(2008) Duca, Gheorghe; Bunduchi, Elena; Gladchi, Viorica; Romanciuc, Lidia; Goreaceva, NelliThe 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.Item EVOLUŢIA COMPOZIŢIEI CHIMICE A APELOR DIN LACUL VALEA MORILOR ÎN PERIOADA DE IARNĂ-PRIMĂVARĂ 2014(CEP USM, 2014) Bunduchi, Elena; Goreaceva, Nelli; Gladchi, Viorica; Furtuna, AnastasiaItem IMPACTUL PROCESELOR REDOX DE TRANSFORMARE A NICOTINAMIDEI ÎN AUTOPURIFICAREA APELOR NATURALE(CEP USM, 2013) Bunduchi, Elena; Gladchi, Viorica; Duca, Gheorghe; Goreaceva, Nelli; Verdeş, VeronicaPrezenta lucrare este consacrată studiului proceselor de transformare a nicotinamidei în apa naturală ca sistem redoxcatalitic, fiind evaluată contribuţia acestor procese la autopurificarea apelor naturale. Rezultatele au relevat că nicotinamida este un substrat de tip peroxidazic. Oxidarea catalitică se realizează efectiv la prezenţa concomitentă a oxigenului molecular şi a peroxidului de hidrogen după mecanismul ion-molecular. Procesul de oxidare catalitic este inhibat la concentraţii ale nicotinamidei de ordinul 10-2 M, ca rezultat al legării ionilor de Cu(II) în complecşi catalitc inactivi. Degradarea fotochimică a nicotinamidei, în condiţiile mediului ambiant, se produce doar prin fotoliză indirectă, fie mediată de fotosensibilizatori sau radicalii O H . Procesele de autopurificare radicalice sunt încetinite la concentraţii ale substanţei ≥ 10-4 M.Item MONITORIZAREA ÎN BAZA INDICATORILOR CINETICI A STĂRII UNOR APE NATURALE (a. 2016)(CEP USM, 2017) Bunduchi, Elena; Gladchi, Viorica; Goreaceva, NelliItem MONITORIZAREA PROCESELOR REDOX DE AUTOPURIFICARE A UNOR APE NATURALE (A. 2017)(CEP USM, 2018) Bunduchi, Elena; Gladchi, Viorica; Goreaceva, NelliProiect:15.817.02.35A Elaborarea procedeelor de epurare a apelor reziduale de poluanţi greu bipodegradabili şi compoziţia, autopurificarea chimică, posibilităţi de valorificare a apelor din bazinul Nistrului de josItem PROCESE DE AUTOPURIFICARE CHIMICĂ ŞI FOTOCHIMICĂ A SISTEMELOR ACVATICE ÎN PREZENŢA COLORANTULUI ALBASTRU REACTIV DIRECT(CEP USM, 2013) Gladchi, Viorica; Duca, Gheorghe; Goreaceva, Nelli; Bunduchi, ElenaÎn lucrare sunt prezentate rezultatele studiului influenţei colorantului albastru reactiv direct asupra proceselor de autopurificare chimică şi fotochimică a sistemelor acvatice pentru a estima rolul colorantului în procesele ce decurg în apele naturaleItem PROCESE REDOX-FOTOCHIMICE DE AUTOPURIFICARE DE COLORANTUL ALBASTRU DIRECT(CEP USM, 2015) Bunduchi, Elena; Gladchi, Viorica; Lutenco, Maria; Goreaceva, NelliItem ROLUL ORGANIZAŢIILOR OBŞTEŞTI ÎN EDUCAŢIA ECOLOGICĂ A POPULAŢIEI(Academia de Ştiinţe a Moldovei, 2005) Gladchi, Viorica; Goreaceva, Nelli; Romanciuc, Lidia; Mardari, Iurie; Borodaev, Ruslan; Bunduchi, ElenaItem THE STUDY OF REDOX CONDITIONS IN THE DNIESTER RIVER(Academia de Știinițe a Moldovei, 2008) Gladchi, Viorica; Goreaceva, Nelli; Duca, Gheorghe; Bunduchi, Elena; Romanciuc, Lidia; Mardari, Igor; Borodaev, RuslanThe work presented in the paper discusses the contribution of the Novodnestrovsc water system to the formation of redox conditions in the lower Dniester. The conclusions were drawn on the basis of a long-term protocol of analyses that included the analysis of the oxygen regime, evaluation of the content of hydrogen peroxide, rH2, biological oxygen demand as well as other additional parameters.Item THE STUDY OF REDOX CONDITIONS IN THE DNIESTER RIVER(2008) Gladchi, Viorica; Goreaceva, Nelli; Duca, Gheorghe; Bunduchi, Elena; Romanciuc, Lidia; Mardari, Igor; Borodaev, RuslanThe work presented in the paper discusses the contribution of the Novodnestrovsc water system to the formation of redox conditions in the lower Dniester. The conclusions were drawn on the basis of a long-term protocol of analyses that included the analysis of the oxygen regime, evaluation of the content of hydrogen peroxide,rH2, biological oxygen demand as well as other additional parameters.Item THE STUDY OF THE BUFFERING CAPACITY OF SEVERAL WATER OBJECTS IN THE REPUBLIC OF MOLDOVA(Academia de Știinițe a Moldovei, 2010) Lis, Angela; Duca, Gheorghe; Bunduchi, Elena; Gladchi, Viorica; Goreaceva, NelliThe Republic of Moldova is situated among countries with relatively poor water resources, therefore their protection and rational use remains a national problem. Due to its geographic position, the Republic of Moldova is subjected to transboundary pollution. The current work represents the estimation of the buffering capacity on the Dniester River waters and its tributaries between November 2008 and October 2009. Decrease of the buffering capacity in water basins leads to disruption of the normal activity of aquatic biota, by increasing the toxicity in their living environment. On the basis of the results of measurements, suggestions for the improvement of the situation will