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Izvedljivost različnih metod za remediacijo onesnaženih tal z območij vrtcev v občini Celje
ID Joveska, Jasmina (Author), ID Leštan, Domen (Mentor) More about this mentor... This link opens in a new window

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Abstract
Analizirali smo vzorce tal z igrišč 13 vrtcev iz občine Celje z namenom določitve pedoloških lastnosti (pH, CaCO3, organske snovi in teksture). Določene so bile količine potencialno nevarnih kovin (PNK) (Pb, Zn in Cd). Da bi ugotovili peroralno biodostopnost potencialno nevarnih kovin (PNK) pri ljudeh, je bila izvedena in vitro Unified BARGE metoda (UBM), ki simulira prebavni trakt in in-vitro standardni operativni postopek (SOP), ki simulira samo želodec. Možna koncentracija Pb v krvi triletnega otroka je bila izračunana z (IEUBK modelom). Da bi zmanjšali skupne in biološko dosegljive koncentracije PNK v tleh, smo uporabili šest različnih metod sanacije. Prva metoda je bila spiranje tal z ligandom (100 mM CaEDTA) z ekstrakcijskim časom 24 h. Druga sanacijska metoda je bila spiranje tal s (100 mM CaEDTA) s podaljšanim časom ekstrakcije 72 ur. Tretja metoda je bila spiranje tal s (3 M HCl) z ekstrakcijskim časom 2 h. Četrta metoda je bila fizična ločitev talnih delcev z mokrim sejanjem skozi 45 μm sito. Peta metoda je bila stabilizacija PTM z 1 % hidroxi-apatitom. Šesta metoda je bila kombinacija spiranja tal s 100 mM CaEDTA (z 72 urno ekstrakcijo) in stabilizacija z 1 % hidroksiapatitom. Po remediaciji so bili vzorci tal raztopljeni v kislini in PNK so bili analizirani z uporabo FAAS. Izračunana je bila skupna količina odstranjenih PNK iz tal. Biodosegljivosti PNK v remediranih tleh je bila določena z UBM in SOP. Uspeh metod je bil odvisen od vrste tal. Z vidika ohranjanja strukturnosti tal, ne spreminjanja pH tal, ekološke ustreznosti (izgube tal), in ekonomičnosti, se je kot najprimernejša metoda izkazala metoda pranja s 100 mM CaEDTA.

Language:Slovenian
Keywords:remediacija, EDTA, HC1, vodeno sejanje, stabilizacija, hydroxyapatit, UBM, SOP, IEUBK model, svinec, kadmij, cink, biodostopnost, biodosegljivost
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:BF - Biotechnical Faculty
Publisher:[J. Joveska]
Year:2018
PID:20.500.12556/RUL-102261 This link opens in a new window
UDC:631.453:502.175(043.2)
COBISS.SI-ID:9007993 This link opens in a new window
Publication date in RUL:30.07.2018
Views:1186
Downloads:467
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Secondary language

Language:English
Title:Feasibility of different methods of remediation of contaminated soils from kindergartens in Celje municipality
Abstract:
Soil samples from playgrounds of 13 kindergartens from Celje municipality were analyzed for pedological properties (pH, CaCO3, organic matter and texture). The amounts of contaminants of potentially toxic metals (PTMs) (Pb, Zn and Cd) were determined. To establish the oral bioaccessibility of potentially toxic metals (PTMs) in humans, in-vitro Unified BARGE Method (UBM) was performed, simulating the gastrointestinal track and in-vitro Standard Operating Procedure (SOP), simulating only the stomach. The PTMs were determined with Flame Atomic Absorption Spectrometer (FAAS). Possible concentration of Pb in the blood of a 3-year-old was calculated with the Integrated Exposure Uptake Biokinetic Model (IEUBK model). In order to reduce the total and bioavailable concentrations of PTMs in the soil, we used six different remediation methods. First method was washing the soil with chelating agent (100 mM CaEDTA) with extraction time of 24 h. Second remediation method was washing with (100 mM CaEDTA) with prolonged extraction time of 72 h. Third method was washing the soil with (3 M HCl) with extraction time of 2 h. The forth method was physical separation of soil fines with wet sieving through 45 µm sieve. The fifth method was stabilization of PTMs with 1 % hydroxyapatite. The sixth method was combination of soil washing with 100 mM CaEDTA (for 72 h extraction time) and stabilization with 1 % hydroxyapatite. After treatment, the soil samples were acid digested and analyzed for PTMs using FAAS. The total quantity of removed PTMs was calculated, and in-vitro bioaccessibility of PTMs in the remediated soils was determined using UBM and SOP. The success of each method was dependent on soil type. Regarding conservation of soil structure, not decreasing pH, eco-friendliness, not loosing big amounts of soil and economy was the most suitable method soil washing with 100 mM CaEDTA.

Keywords:remediation, EDTA, HCl, wet sieving, stabilization, hydroxyapatite, UBM, SOP, IEUBK model, lead, cadmium, zinc, bioavailability, bioaccessibility

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