Browsing Τμήμα Χημείας / Department of Chemistry by Author "Efstathiou, Maria"
Now showing items 1-13 of 13
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Article
Adsorption of trivalent lanthanides by marine sediments
Liatsou, Ioanna; Efstathiou, Maria; Pashalidis, Ioannis (2015)The interaction of Eu(III) with two different types of marine sediments has been investigated as a function of various parameters (e.g. pH, [Eu(III)]o, I, humic acid) to evaluate their effect on the Eu(III) adsorption. The ...
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Article
Adsorptive removal of U(VI) and Th(IV) from aqueous solutions using polymer-based electrospun PEO/PLLA fibrous membranes
Savva, Ioanna; Efstathiou, Maria; Krasia‐Christoforou, Theodora; Pashalidis, Ioannis (2013)Fibrous membranes based on poly(ethylene oxide) and poly(l-lactide) fabricated by electrospinning were evaluated for the first time as substrates for the adsorption of tetravalent thorium (Th(IV)) and hexavalent uranium ...
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Article
A comparative study of the adsorption of uranium on commercial and natural (Cypriot) sea sand samples
Efstathiou, Maria; Pashalidis, Ioannis (2013)The adsorption of hexavalent uranium on two different types of sea sand [e.g. a local, Cypriot (N-SS) and a commercially available marine sediment (C-SS)] has been investigated as a function of pH, initial metal concentration, ...
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Article
A comparative study on the sorption of tri- and hexavalent actinides on sea sediments
Efstathiou, Maria; Pashalidis, Ioannis (2017)The interaction of tri- and hexavalent actinides with local, Cypriot marine sediments has been investigated as a function of initial metal concentration, before and after “coating” with natural organic matter. Evaluation ...
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Conference Object
Determination of uranium concentration in ground water samples of Northern Greece
Samaropoulos, I.; Efstathiou, Maria; Pashalidis, Ioannis; Ioannidou, Alexandra (2012)The activity concentration of 238U and 234U has been determined in groundwater samples of hot springs and deep wells from the region of Northern Greece. The analysis was performed by alpha spectroscopy after pre-concentration ...
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Article
Emanation studies of radium containing materials by a simple radon monitoring system
Efstathiou, Maria; Sarrou, I.; Pashalidis, Ioannis (2013)The applicability of a radon emanation system to radium determination in fine-grained solid samples has been investigated by means of a closed radon emanation system consisting of a radon monitor and an aluminium vessel. ...
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Article
Seasonal variation, chemical behavior and kinetics of uranium in an unconfined groundwater system
Efstathiou, Maria; Aristarchou, T.; Kiliari, T.; Demetriou, Antri; Pashalidis, Ioannis (2014)The seasonal changes in the concentration of uranium in an unconfined groundwater system in Cyprus have been investigated and compared to corresponding changes of boron and salinity, to better understand the chemical ...
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Article
Simplified determination of uranium in contaminated sea sand samples by alpha-spectroscopy after acidic desorption and liquid–liquid extraction
Efstathiou, Maria; Pashalidis, Ioannis (2015)For the determination of uranium in contaminated sea sand samples by alpha-spectroscopy, we have investigated the applicability of different pre-analytical procedures. The direct electrodeposition after acidic dissolution ...
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Article
A simplified determination of uranium in phosphate rock and phosphogypsum by alpha-spectroscopy after its separation by liquid-extraction
Andreou, Giorgos; Efstathiou, Maria; Pashalidis, Ioannis (2012)A relatively rapid, economic and robust procedure is described for the radiometric analysis of uranium in phosphate rock and phosphogypsum. The analysis is performed by alpha spectroscopy after pre-concentration and ...
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Article
Uranium analysis in Cypriot groundwaters by total alpha-radiometry and alpha-spectroscopy
Efstathiou, Maria; Kiliari, T.; Pashalidis, Ioannis (2011)Two different alpha-radiometric methods (e.g. alpha-spectroscopy and alpha-particle counting) have been applied to the determination of uranium in Cypriot groundwater samples after separation of the radionuclides by cation ...
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Article
Uranium in ground water samples of Northern Greece
Ioannidou, Alexandra; Samaropoulos, I.; Efstathiou, Maria; Pashalidis, Ioannis (2011)The activity concentrations of 238U and 234U have been determined in groundwater samples of hot springs and deep wells in Northern Greece. The analysis was performed by alpha spectroscopy after pre-concentration and ...
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Article
Uranium levels in Cypriot groundwater samples determined by ICP-MS and α-spectroscopy
Charalambous, Chrystalla; Aletrari, Maria; Piera, Panagiota; Nicolaidou-Kanari, Popi; Efstathiou, Maria; Pashalidis, Ioannis (2013)The uranium concentration and the isotopic ratio 238U/234U have been determined in Cypriot groundwater samples by ICP-MS after ultrafiltration and acidification of the samples and α-spectroscopy after pre-concentration and ...
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Article
β-ketoester-functionalized magnetoactive electrospun polymer fibers as Eu(III) adsorbents
Panteli, Sotiris; Savva, Ioanna; Efstathiou, Maria; Vekas, Ladislau; Marinica, Oana Maria; Krasia-Christoforou, Theodora; Pashalidis, Ioannis (2018)Blended polymer fibers based on a hydrophobic random copolymer having β-ketoester metal ion binding functionalities namely poly(methyl methacrylate)-random-poly(2-(acetoacetoxy) ethyl methacrylate) (PMMA-co-PAEMA) and the ...