Physical Interpretation of Solubility Interaction Constants from the Series Expansion of the Relative Activity Coefficients

1994 ◽  
Vol 59 (9) ◽  
pp. 1911-1921 ◽  
Author(s):  
Jaroslav Nývlt ◽  
Jitka Eysseltová
Keyword(s):  
Activity Coefficient ◽  
Series Expansion ◽  
Activity Coefficients ◽  
Physical Interpretation ◽  
Ternary Systems ◽  
Relative Activity ◽  
Solubility Data ◽  
Close Relationship ◽  
Insight Into ◽  
Saturated Solutions

Hydration analysis, which enables information on ionic processes in saturated solutions to be derived from solubility data in ternary systems, was applied to the interpretation of solubility interaction constants from the relative activity coefficient expansion. A close relationship was found between the hydration analysis parameters and the solubility interaction constants characterizing the relative activity of solute, which extends our insight into the ionic behaviour of the system studied by using the values of the interaction constants.

scholarly journals Mean Activity Coefficients of Peroxodisulfates in Saturated Solutions of the Conversion System 2NH4+ — 2Na+ — S2O8 2– — SO4 2– — H2O at 20 °C and 30 °C

2013 ◽  
Vol 6 (2) ◽  
pp. 163-167
Author(s):  
Jan Balej
Keyword(s):  
Activity Coefficient ◽  
Activity Coefficients ◽  
Relative Activity ◽  
Solubility Data ◽  
Correlation Equations ◽  
Conversion System ◽  
Mean Activity Coefficients ◽  
Saturated Solutions

Abstract Solubility data of the conversion system 2NH4+ - 2Na+ - S2O82- - SO42- - H2O at 20 °C and 30 °C for the partial pseudoternary systems Na2S2O8-(NH4)2SO4-H2O, (NH4)2S2O8-Na2SO4-H2O, Na2S2O8-NaNH4SO4-H2O and (NH4)2S2O8-NaNH4SO4-H2O have been correlated using the relative activity coefficient expansion of the crystallizing component. The obtained correlation equations have been used for the calculation of mean activity coefficients of ammonium and sodium peroxodisulfates in their saturated solutions of the mentioned pseudoternary systems.

Solubility in the System (NH4)2S2O8—NH3—H2O and Mean Activity Coefficients of Saturated Solutions of (NH4)2S2O8

2012 ◽  
Vol 5 (1) ◽  
pp. 12-14
Author(s):  
Jan Balej
Keyword(s):  
Activity Coefficient ◽  
Activity Coefficients ◽  
Pure Water ◽  
Relative Activity ◽  
Mean Activity Coefficient ◽  
The Mean ◽  
Water Values ◽  
Mean Activity Coefficients ◽  
Ammonium Peroxodisulfate ◽  
Saturated Solutions

Solubility in the System (NH4)2S2O8—NH3—H2O and Mean Activity Coefficients of Saturated Solutions of (NH4)2S2O8The solubility data of ammonium peroxodisulfate in aqueous ammonia solutions at 15.5 °C have been evaluated using the relative activity coefficient expansion. Using the known value of the mean activity coefficient of saturated solution of ammonium peroxodisulfate in pure water, values of the mean activity coefficients of this salt in the saturated solutions of the given system have been calculated.

Hydration Analysis and the Expansion of Relative Activity Coefficients

2000 ◽  
Vol 65 (12) ◽  
pp. 1833-1838
Author(s):  
Jaroslav Nývlt
Keyword(s):  
Ternary System ◽  
Phase Equilibria ◽  
Activity Coefficients ◽  
Binary Systems ◽  
Ternary Systems ◽  
Relative Activity ◽  
Solubility Data ◽  
Thermodynamic Condition ◽  
Correlation Methods ◽  
Correlation Parameters

Of correlation methods for solubility in ternary systems, the method of expansion of relative activity coefficients and the hydration analysis are based on the thermodynamic condition of phase equilibria. Both of them require only reliable solubility data in the ternary system and corresponding binary systems. Correlation parameters of both of these methods are interrelated and the methods are compared on the system K2SO4-H2SO4-H2O at 50 °C.

Solubility correlations for ternary systems containing peroxodisulphates

1982 ◽  
Vol 47 (6) ◽  
pp. 1539-1548 ◽  
Author(s):  
Jan Balej
Keyword(s):  
Correlation Function ◽  
Ionic Strength ◽  
Activity Coefficient ◽  
Solid Solutions ◽  
Ternary Systems ◽  
Relative Activity ◽  
Saturated Solution ◽  
Good Representation ◽  
Monovalent Cations ◽  
Experimental Solubility

Correlations of solubility data previously measured on ternary systems containing peroxodisulphates of monovalent cations have been established using the method of relative activity coefficient expansion. The relationships obtained give a fairly good representation of experimental solubility curves for systems which do not form solid solutions. The general form of the correlation function is discussed in relation to the resultant ionic strength of saturated solution.

Research on Thermodynamic Properties of Bioleaching Solution in Lean Nickel-Cobalt Ore by Pitzer - Meissner Model

2015 ◽  
Vol 1092-1093 ◽  
pp. 1455-1459
Author(s):  
Chu Yue Hou ◽  
Gui Ying Zhou ◽  
Jian Kang Wen ◽  
Biao Wu
Keyword(s):  
Thermodynamic Properties ◽  
Activity Coefficient ◽  
Aqueous Solutions ◽  
Activity Coefficients ◽  
Pitzer Model ◽  
Foreign Ions ◽  
Nickel Cobalt

In this paper, we jointly use the Pitzer model and the Meissner model to study thermodynamic laws of bioleaching solution in a lean nickel-cobalt ore in the Jilin Baishan, by using the Pitzer model to calculate activity coefficients of single electrolyte aqueous solutions and the Meissner model to calculate activity coefficients of components in the bioleaching solution. Also we studied the rules of activity coefficient of NiSO4 and CoSO4 in the solution. Results show that when separating and purifying foreign ions from bioleaching solution of the lean nickel-cobalt ore, the descending sequence of their ion concentration’s effect over the solution is Mg2+, Fe3+, Fe2+, Ni2+, Co2+ and Ca2+.

Abraham model correlations for solute transfer into 2-methyl-2-butanol based on measured activity coefficient and solubility data at 298.15 K

2019 ◽  
Vol 293 ◽  
pp. 111454 ◽  
Author(s):  
Igor A. Sedov ◽  
Timur M. Salikov ◽  
Ellen Qian ◽  
Anisha Wadawadigi ◽  
Olivia Zha ◽  
...  
Keyword(s):  
Activity Coefficient ◽  
Solubility Data ◽  
Solute Transfer ◽  
Abraham Model ◽  
Measured Activity

scholarly journals Application of COSMO-RS Method for the Prediction of Liquid-Liquid Equilibrium of Water/n-Dodecane/1-Butanol

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
S. Balasubramonian ◽  
Shekhar Kumar ◽  
D. Sivakumar ◽  
U. Kamachi Mudali
Keyword(s):  
Activity Coefficient ◽  
Mutual Solubility ◽  
Solubility Data ◽  
Interaction Parameters ◽  
Binary Interaction ◽  
Liquid Equilibrium ◽  
Model Interaction ◽  
Uniquac Model ◽  
Unifac Model ◽  
Lle Data

The liquid-liquid equilibrium (LLE) for the system water-dodecane-butanol was estimated using the UNIQUAC model. In the UNIQUAC model interaction parameters were estimated from the vapor-liquid equilibrium (VLE) and LLE data of their constituent binary pairs. The water-dodecane-butanol LLE was experimentally measured at 298.15 K. Phase stability constraints were taken into account while calculating the binary interaction parameters from the mutual solubility data. The COSMO-RS method was used to estimate the activity coefficient in the miscible binary pair. The ternary LLE composition was predicted using the experimental VLE data as well as using the COSMO-RS calculated activity coefficient data along with the experimental mutual solubility data. In the latter case the root mean square deviation (RMSD) for the distribution of butanol between aqueous and organic phase is 0.24%. The corresponding UNIFAC model prediction is 7.63%.

Slow and Fast (Gamma) Neuronal Oscillations in the Perirhinal Cortex and Lateral Amygdala

2001 ◽  
Vol 85 (4) ◽  
pp. 1661-1672 ◽  
Author(s):  
Dawn R. Collins ◽  
J. Guillaume Pelletier ◽  
Denis Paré
Keyword(s):  
Spontaneous Activity ◽  
Perirhinal Cortex ◽  
Field Potentials ◽  
Lateral Amygdala ◽  
Cooperative Interactions ◽  
Close Relationship ◽  
Lesion Studies ◽  
Highly Correlated ◽  
Fast Oscillations ◽  
Insight Into

Most lesion studies emphasize the distinct contributions of the amygdala and perirhinal cortex to memory. Yet, the presence of strong reciprocal excitatory projections between these two structures suggests that they are functionally coupled. To gain some insight into this issue, the present study examined whether the close anatomical ties existing between perirhinal and lateral amygdala (LA) neurons are expressed in their spontaneous activity. To this end, multiple simultaneous recordings of single unit discharges and local field potentials were performed in the LA and perirhinal cortex in ketamine-xylazine anesthetized cats. The perirhinal cortex and LA exhibited a similar pattern of spontaneous activity. Recordings at both sites were dominated by a slow focal oscillation at 1 Hz onto which was superimposed a faster rhythm (≈30 Hz) whose amplitude fluctuated cyclically. Computing crosscorrelograms between focal waves recorded simultaneously in the perirhinal cortex and LA revealed a close relationship between their spontaneous activity. Even when recording sites were separated by as much as 8 mm, the slow focal oscillation remained highly correlated ( r ≥ 0.7). In contrast, the correlation between fast oscillations was usually lower ( r ≈ 0.3). Perievent histograms of neuronal discharges revealed that the firing probability of most LA and perirhinal neurons increased during the depth-negative component of the slow oscillation. In addition, respectively, 47 and 64% of LA and perirhinal neurons exhibited a significant modulation of firing probability in relation to the fast oscillations. Finally, crosscorrelating unit discharges simultaneously recorded in the LA and perirhinal cortex confirmed the presence of phase-related oscillatory events in both structures. In summary, our results suggest that the interconnections existing between the perirhinal cortex and LA can support the genesis of coherent neuronal activities at various frequencies. These results imply that cooperative interactions must be taking place between these structures.

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