Browsing by Author "Antoniou, Stella"
Now showing items 1-9 of 9
-
Article
Alpha radiometry of uranium in surface and ground waters by liquid scintillation counting after separation of the radionuclide by cation exchange
Antoniou, Stella; Tsiaili, A.; Pashalidis, Ioannis (2008)The alpha radioactivity of surface and ground water samples has been determined by liquid scintillation counting (LSC) after chemical preparation of the samples by cation exchange using the Chelex 100 resin. The method ...
-
Article
Alpha-radiometry of seawater by liquid scintillation counting
Antoniou, Stella; Costa, Constantinos; Pashalidis, Ioannis (2006)Liquid scintillation counting of the alpha-radionuclides after pre-concentration by cation-exchange represents a simple and robust method for the determination of total alpha-radioactivity in seawater. The total efficiency ...
-
Article
The effect of aging and natural organic matter on the Th(OH)4 solubility
Prodromou, Melpomeni; Antoniou, Stella; Pashalidis, Ioannis (2014)The solution chemistry of actinides, particularly hydrolysis, is of major importance in the design of nuclear waste repositories and in relation to nuclear fuel reprocessing cycles. In this study the formation and solubility ...
-
Article
The effect of humic acid on the formation and solubility of secondary solid phases (Nd(OH)CO3 and Sm(OH)CO3)
Antoniou, Stella; Pashalidis, Ioannis; Gessner, A.; Kumke, M. U. (2011)The formation of secondary Ln(III) solid phases (e.g. Nd(OH)CO3 and Sm(OH)CO3) has been studied as a function of the humic acid (HA) concentration in 0.1M NaClO4 aqueous solution and their solubility has been investigated ...
-
Article
Effect of humic acid on the solid phase stability of UO2CO 3
Antoniou, Stella; Kolokassidou, C.; Polychronopoulou, Kyriaki; Pashalidis, Ioannis (2009)The stability of UO2CO3 has been studied as a function of the humic acid concentration in 0.1M NaClO4, in the weak acidic pH range (4.5-5) under CO2 atmosphere. The solid phase under investigation has been prepared by ...
-
Article
The effect of natural organic matter on the formation and solubility of M(OH)4 solid phases
Antoniou, Stella; Pashalidis, Ioannis (2014)In this study the formation of M(OH)4 solid phases (e.g. Th(IV), Ce(IV) and Zr(IV)) has been investigated as a function of the natural organic matter (NOM) concentration in 0.1 M NaClO4, in the pH range between 2 and 5, ...
-
Article
Experimental and theoretical studies on physico-chemical parameters affecting the solubility of phosphogypsum
Papanicolaou, F.; Antoniou, Stella; Pashalidis, Ioannis (2009)Phosphogypsum is a waste by-product of the phosphate fertilizer industry, which is usually disposed in the environment because of its restricted use in industrial applications. Physico-chemical conditions existing in stack ...
-
Article
Redox chemistry of sulphate and uranium in a phosphogypsum tailings dump
Papanicolaou, F.; Antoniou, Stella; Pashalidis, Ioannis (2010)The present study aims to assess the effect of redox conditions existing within the tailings dump on the stability of phosphogypsum (e.g. sulphate reduction) and uranium(VI). Phosphogypsum sampling and in-situ measurements ...
-
Article
Spectroscopic investigations on the effect of humic acid on the formation and solubility of secondary solid phases of Ln2(CO3) 3
Antoniou, Stella; Pashalidis, Ioannis; Gessner, A.; Kumke, M. U. (2011)The formation of secondary Ln(III) solid phases (e.g., Nd 2(CO3)3 and Sm2(CO3) 3) was studied as a function of the humic acid concentration in 0.1 mol/L NaClO4 aqueous solution in the neutral pH range (5-6.5). The solid ...