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1.
Prisotnost mikroplastike in njena pestrost v vodnem stolpcu in školjkah klapavicah (Mytilus galloprovincialis) iz školjčišč slovenskega morja
Irma Hostnik, 2023, master's thesis

Abstract: V magistrskem delu smo želeli ugotoviti, katera lokacija v slovenskem morju je najbolj primerna za intenzivno gojenje školjk klapavic (Mytilus galloprovincialis) s stališča prisotnosti mikroplastike in na kateri globini so klapavice najmanj podvržene njenemu vplivu. Analizirali smo mikroodpadke, vključujoč mikroplastiko, v vzorcih morske vode ter školjkah iz školjčišč na Debelem rtiču, Seči in Strunjanu. Morsko vodo smo vzorčili z bencinsko črpalko ter na plovilu filtrirali prečrpano vodo na situ s porami 100 µm (vzorčenje in-situ). Na posameznem vzorčnem mestu smo prečrpali tri paralelne vzorce 1 m3 morske vode na dveh globinah. Skupno smo analizirali filtrate 18 m3 morske vode. Poleg morske vode smo na globini vzorčenja vode odvzeli školjke klapavice, in sicer petdeset školjk na posamezni globini. Analizirali smo torej skupno tristo školjk, sto školjk iz vsakega od treh školjčišč. Prisotnost mikroodpadkov in mikroplastike smo potrdili v vseh vzorcih vode. Z najvišjimi koncentracijami mikroodpadkov je izstopala zgornja vzorčna plast školjčišča na Debelem rtiču. Mikroodpadke smo našli v kar 75,7 % školjk. Najvišje povprečno število mikroodpadkov na školjko smo ugotovili pri školjkah iz školjčišča v Strunjanu.
Keywords: mikroplastika, vodna črpalka, školjke, vodni stolpec, morje, koncentracija mikroodpadkov, koncentracija mikroplastike, FTIR
Published in RUNG: 09.10.2023; Views: 860; Downloads: 13
.pdf Full text (5,02 MB)

2.
Extraction of Organochlorine Pesticides from Plastic Pellets and Plastic Type Analysis
Maryline Pflieger, Petra Makorič, Manca Kovač Viršek, Špela Koren, 2017, review article

Abstract: Plastic resin pellets, categorized as microplastics (≤5 mm in diameter), are small granules that can be unintentionally released to the environment during manufacturing and transport. Because of their environmental persistence, they are widely distributed in the oceans and on beaches all over the world. They can act as a vector of potentially toxic organic compounds (e.g., polychlorinated biphenyls) and might consequently negatively affect marine organisms. Their possible impacts along the food chain are not yet well understood. In order to assess the hazards associated with the occurrence of plastic pellets in the marine environment, it is necessary to develop methodologies that allow for rapid determination of associated organic contaminant levels. The present protocol describes the different steps required for sampling resin pellets, analyzing adsorbed organochlorine pesticides (OCPs) and identifying the plastic type. The focus is on the extraction of OCPs from plastic pellets by means of a pressurized fluid extractor (PFE) and on the polymer chemical analysis applying Fourier Transform-InfraRed (FT-IR) spectroscopy. The developed methodology focuses on 11 OCPs and related compounds, including dichlorodiphenyltrichloroethane (DDT) and its two main metabolites, lindane and two production isomers, as well as the two biologically active isomers of technical endosulfan. This protocol constitutes a simple and rapid alternative to existing methodology for evaluating the concentration of organic contaminants adsorbed on plastic pieces.
Keywords: Environmental Sciences, Issue 125, Microplastics, resin pellets, pesticides, persistent organic pollutants, organochlorine pesticides, dichlorodiphenyltrichloroethane, endosulfan, hexachlorocyclohexane, lindane, Fourier transform infrared spectroscopy, pressurized fluid extractor
Published in RUNG: 10.07.2017; Views: 4570; Downloads: 0

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