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dc.contributor.authorMisevičienė, Stefanija-
dc.descriptionPuslapiai nurodyti pagal pataisytą leidinį-
dc.description.abstractThe quality of water in rivers of central Lithuania is often not good due to intensive anthropogenic activities. When rivers flow through the town’s territory, concentrated pollution, such as rainwater, industrial and productional waste water discharges, contributes to diffuse sources of pollution. If biogenic substances are the main indicators for diffuse pollution, organic matter, expressed as BOD, is the indicator for concentrated pollution. The article provides the 2013 – 2017 monitoring data on the changes of organic matter in the water of Dotnuvele and Smilga rivers and discusses the reasons for fluctuations in concentrations of these substances. The aim of the research is to investigate the changes in the organic matter of Dotnuvele and Smilga rivers, depending on meteorological factors. For chemical analysis, water samples were taken quarterly. Water analysis was carried out by the ASU Chemical Analytical Laboratory of Water Resources Engineering Institute. The amount of organic matter (BOD7) is calculated as the difference in oxygen content after 7 days of incubation, while the amount of dissolved oxygen (O2) in the water is determined by the electrochemical probe method. The concentrations of BOD7 and O2 in the water of both rivers is compared with the criteria for assessing the ecological status of surface water bodies. The research has shown that the dissolved oxygen concentrations in rivers’ water are strongly influenced by water temperature and precipitation. The lower the temperature, the more of this element is found in rivers’ water (r = -0.69). A lower precipitation amount, which reaches the rivers, increases the amount of oxygen in them (r = -0.50). The increase of BOD7 concentrations in rivers’ water was caused by higher precipitation amount (r = 0.46), higher air (r = 0.41) and lower water temperature (r = -0.41). The ecological status of Dotnuvele and Smilga rivers was usually averageen
dc.description.sponsorshipVytauto Didžiojo universitetas-
dc.description.sponsorshipŽemės ūkio akademija-
dc.format.extentp. 225-226-
dc.relation.ispartofRural Development 2017 [elektroninis išteklius]: Bioeconomy Challenges : The 8th International Scientific Conference, 23-24th November, 2017, Aleksandras Stulginskis University : Abstracts Book. Akademija : Aleksandras Stulginskis University, 2017-
dc.subjectBiochemical oxygen demanden
dc.subjectdissolved oxygenen
dc.subjectecological stateen
dc.subjectsurface wateren
dc.subject.classificationTezės kituose recenzuojamuose leidiniuose / Theses in other peer-reviewed publications (T1e)-
dc.subject.otherAplinkos inžinerija / Environmental engineering (T004)-
dc.titleChanges in Concentrations of Organic Matter in the Mouths of Dotnuvele and Smilga Riversen
dc.typeconference paper-
local.object{"source": {"code": "vdu", "handle": "52832"}, "publisher": {"other": ["Aleksandras Stulginskis University"], "list": false}, "db": {"clarivate": false, "scopus": false, "list": false}, "isbn": ["9786094491238"], "code": "T1e", "subject": ["T004"], "url": [""], "country": "LT", "language": "en", "area": "T", "original": true, "pages": 2, "sheets": 0.143, "timestamp": "20181114160431.0", "account": {"year": 2017, "late": false}, "na": 1, "nip": 0, "affiliation": [{"contribution": 1, "aip": 1, "rel": "aut", "org": [{"create": true, "contribution": 1, "name": "Vytauto Didžiojo universitetas", "id": "111950396", "level": "0", "type": "uni", "research": "1", "status": "1", "unit": {"name": "Žemės ūkio akademija", "id": "09", "level": "1", "type": "aka", "research": "1", "status": "1"}}], "id": "BF2CAF72D9740F2553D261267E4691BC", "lname": "Misevičienė", "fname": "Stefanija", "status": "0", "name": "Misevičienė, Stefanija"}]}-
item.fulltextWith Fulltext-Žemės ūkio akademija-
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications
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