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Abstract  

The solubility and solubility product of europium trifluoride were measured by radiometric, potentiometric and conductometric methods. There are significant differences in the values of both solubility and solubility product obtained by the three different techniques. Due to reasons discussed in the text, radiometric values seem to be more acceptable than the others. The thermodynamic functions such as ΔH0, ΔG0 and ΔS0 for the dissolution process were also measured. The positive values of ΔH0 and ΔG0 and the negative value of ΔS0 are indicative of the slight solubility of EuF3. The dependence of solubility on pH and also on the fluoride concentration has also been studied. It was confirmed that europium forms a monofoluoride complex in aqueous solution. The stability constant of this complex was estimated.

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Introduction Cytokines are secreted mostly by cells of the immune system. They are small regulatory proteins that participate in anti-inflammatory and pro-inflammatory processes in the body. Cytokines and their soluble

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molecules [ 6 ]. Adhesion molecules play a central role in endothelial cells–leukocytes adherence and the subsequent migration of leukocytes into perivascular tissue. Soluble vascular cell adhesion molecule-1 (sVCAM-1) was the first adhesion molecule to be

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Journal of Radioanalytical and Nuclear Chemistry
Authors: H. López-González, M. Jiménez-Reyes, M. Solache-Ríos, and A. Rojas-Hernández

Abstract  

Solubility product (Lu(OH)3(s)⇆Lu3++3OH) and first hydrolysis (Lu3++H2O⇆Lu(OH)2++H+) constants were determined for an initial lutetium concentration range from 3.72·10−5 mol·dm−3 to 2.09·10−3 mol·dm−3. Measurements were made in 2 mol·dm−3 NaClO4 ionic strength, under CO2-free conditions and temperature was controlled at 303 K. Solubility diagrams (pLuaq vs. pC H) were determined by means of a radiochemical method using 177Lu. The pC H for the beginning of precipitation and solubility product constant were determined from these diagrams and both the first hydrolysis and solubility product constants were calculated by fitting the diagrams to the solubility equation. The pC H values of precipitation increases inversely to [Lu3+]initial and the values for the first hydrolysis and solubility product constants were log10 β* Lu,H = −7.92±0.07 and log10 K*sp,Lu(OH)3 = −23.37±0.14. Individual solubility values for pC H range between the beginning of precipitation and 8.5 were S Lu3+ = 3.5·10−7 mol·dm−3, S Lu(OH)2+ = 6.2·10−7 mol·dm−3, and then total solubility was 9.7·10−7 mol·dm−3.

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Acta Chromatographica
Authors: Leonel Vinicius Constantino, Douglas Mariani Zeffa, Alessandra Koltun, Mariana Ragassi Urbano, Alisson Wilson Santos Sanzovo, and Suzana Lucy Nixdorf

post-harvest processes, which contribute to the characteristic flavor and aroma of the beverage [ 5 , 7 – 9 ]. Carbohydrates are the main components of green, roasted, and soluble coffee, and they account for 50% of its dry matter, on average

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Abstract  

The structural and solubility changes of a water-insoluble arabinoxylan with a low degree of branching was studied after -irradiation by IR spectroscopy and chemical analysis of the polysaccharide and its polymeric fractions.

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Abstract  

The solubilities of lanthanum oxide in LiF, NaF, KF and eutectic melt LiF-NaF-KF (46.5 mole% LiF; 11.5 mole% NaF and 42.0 mole% KF) were measured in order to find the suitable electrolyte for electrodeposition of lanthanum. Solidus-liquidus lines were obtained by the method of thermal analysis. The solubility of lanthanum oxide in alkali fluorides is rather low and decreases in the order LiF>NaF>KF. It was found that lanthanum oxide reacts with the components of the melt. LaOF and alkali metal oxide are formed during dissolution of La2O3 in the melt.

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Abstract  

This study was carried out to investigate the characteristics of an oxidative-dissolution of fission products (FP) when uranium (U) is dissolved in a Na2CO3–H2O2 carbonate solution. Simulated FP-oxides which contained 12 components were added to the solution to examine their dissolution behaviors. It was found that H2O2 was an effective oxidant to minimize the dissolution of FP. For the 0.5 M Na2CO3–0.5 M H2O2 solution, such elements as Re, Te, Cs, and MoO2 were dissolved with yields of 98 ± 2%, 98 ± 2%, 93 ± 2%, and 26 ± 3%, respectively, for 2 h. Among these components, Re, Te, and Cs were completely dissolved within 10–20 min without regard to the concentrations of Na2CO3, and H2O2 due to their high solubility in the carbonate solution with and without H2O2. However, MoO2 was very slowly dissolved and its yield was 29 ± 3% for 4 h. The pH of the dissolved solution revealed the greatest influence on the dissolution yields of the FP, exhibiting the most effective pH condition in the range of 10–12 in order to create a considerable suppression of the co-dissolution of FP during the oxidative-dissolution of U.

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Ringens, P. J., Hoenders, H. J., Bloemendal, H. (1982) Effect of aging on the water-soluble and water-insoluble protein in normal human lens. Exp. Eye Res. 34 , 201-207. Effect of aging on the water-soluble and water

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-, t - és Welch-próbák. In: Biometria agrártudományi alkalmazásokkal. 164–168. Budapesti Corvinus Egyetem–Aula Kiadó Kft. Budapest. Hong-Ling, L. et al., 2008. Effects of soluble organic N on evaluating soil N

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