Interaction of Univalent and Divalent Cations with Carrageenans in Aqueous Solution

1977 ◽  
Vol 10 (1) ◽  
pp. 197-201 ◽  
Author(s):  
G. Pass ◽  
G. O. Phillips ◽  
D. J. Wedlock
Keyword(s):  
Aqueous Solution ◽  
Divalent Cations

Supramolecular assemblies of phenyl-pyridyl-triazolopyridine and β-cyclodextrin as sensor of divalent cations in aqueous solution

2015 ◽  
Vol 121 ◽  
pp. 295-301 ◽  
Author(s):  
Carolina Jullian ◽  
Samuel Fernández-Sandoval ◽  
Cristian Celis-Barros ◽  
Belén Abarca ◽  
Rafael Ballesteros ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Divalent Cations ◽  
Supramolecular Assemblies

Ionic association in aqueous solutions of bivalent sulphates

1969 ◽  
Vol 313 (1512) ◽  
pp. 131-147 ◽  
Keyword(s):  
Aqueous Solution ◽  
Osmotic Coefficient ◽  
Dissociation Constants ◽  
Divalent Cations ◽  
Ion Pairs ◽  
Osmotic Coefficients ◽  
Close Approach ◽  
Complete Analysis ◽  
Hydration Water ◽  
Similar Magnitude

Osmotic coefficient data for the sulphates of Mg, Ca, Zn, Ni and Cu in aqueous solution have been analysed to obtain the dissociation constants (d.c.) of ion pairs, triplets and quadruplets, as well as information on their state of hydration. The d.c.’s of the sulphate ion pairs, though of similar magnitude, show distinct individualities, and the trend is similar to that of the d.c.’s calculated for the nitrates of di-valent ions, though the d.c.’s of the latter are about 200 times larger. The d.c.’s of the ion triplets show no correlations, but their absolute values are similar to those calculated from the theory of Fuoss & Kraus (1933, 1935) based on electrostatic considerations. The hydration parameters of the associated sulphates (both pairs and triplets), as characterized in the linear (statistical) terms of the osmotic coefficients, are only slightly smaller than those of the fully dissociated electrolytes, indicating that there is only little loss of hydration water in the process of association, in spite of the heavy hydration of the divalent cations and the relatively close approach of the sulphate ion. The complete analysis of the osmotic coefficient curves makes it possible to calculate the absolute values of the activity coefficients of the divalent sulphates (previously not known to any accuracy).

Equilibria in aqueous solution between divalent cations and the α-amino acid 2-(benzylamino)-2-deoxy-d-glycero-d-gulo-heptonic acid

Polyhedron ◽  
1992 ◽  
Vol 11 (5) ◽  
pp. 563-566 ◽  
Author(s):  
C. Valenzuela-Calahorro ◽  
M.A. Díaz-Díez ◽  
E. Sabio-Rey ◽  
F.J. García-Barros ◽  
E. Román-Galán
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Divalent Cations ◽  
Equilibria In Aqueous Solution

The relative stabilities of A- and B-type carbonate substitution in apatites synthesized in aqueous solution

2016 ◽  
Vol 80 (6) ◽  
pp. 977-983 ◽  
Author(s):  
C. H. Yoder ◽  
N. T. Landes ◽  
L. K. Tran ◽  
A. K. Smith ◽  
J. D. Pasteris
Keyword(s):  
Aqueous Solution ◽  
Inductively Coupled Plasma ◽  
Divalent Cations ◽  
Atomic Emission ◽  
Monovalent Cation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Inductively Coupled ◽  
Carbonate Substitution ◽  
Type Substitution

AbstractCarbonated calcium apatites doped with a monovalent cation (Li+, Na+, or K+) or a divalent cation (Mg2+ or Zn2+) were prepared in aqueous solution and analysed by powder X-ray diffraction, inductively coupled plasma atomic emission spectroscopy and infrared spectroscopy. The hypothesis that the location of carbonate in the apatite structure, either in place of hydroxide ions in the c-axis channels (A-type substitution) or in place of phosphate (B-type substitution), is affected by the solution energetics of the cation (specifically its enthalpy of hydration) was strengthened by the observation of larger amounts of Atype carbonate in apatites containing the monovalent cations in aqueous solution. It is shown that cations with low negative enthalpies of hydration favour A-type substitution, whereas cations with higher negative hydration enthalpies, such as divalent cations (Mg2+, Zn2+), favour B-type substitution.

scholarly journals The hydration of divalent cations in aqueous solution. An X-ray investigation with isomorphous replacement

1970 ◽  
Vol 3 (6) ◽  
pp. 486-492 ◽  
Author(s):  
W. Bol ◽  
G. J. A. Gerrits ◽  
C. L. van Panthaleon Eck
Keyword(s):  
Aqueous Solution ◽  
Divalent Cations ◽  
X Ray ◽  
Isomorphous Replacement

Interaction of three pradimicin derivatives with divalent cations in aqueous solution

2000 ◽  
Vol 56 (6) ◽  
pp. 1233-1243 ◽  
Author(s):  
Mei Hu ◽  
Yasuko Ishizuka ◽  
Yasuhiro Igarashi ◽  
Toshikazu Oki ◽  
Hiroshi Nakanishi
Keyword(s):  
Aqueous Solution ◽  
Divalent Cations

ChemInform Abstract: ADSORPTION OF SOME DIVALENT CATIONS FROM AQUEOUS SOLUTION ON PRECIPITATED SILICA

1983 ◽  
Vol 14 (52) ◽  
Author(s):  
G. C. BYE ◽  
M. MCEVOY ◽  
M. A. MALATI
Keyword(s):  
Aqueous Solution ◽  
Divalent Cations ◽  
Precipitated Silica

scholarly journals Adsorption of some Metal Ions from Aqueous Solution on Iraqi Rice Bran and Its Relation to the Physical Properties of these Metal Ions

2014 ◽  
Vol 11 (4) ◽  
pp. 1604-1611
Author(s):  
Baghdad Science Journal
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Metal Ions ◽  
Rice Bran ◽  
Ionic Radius ◽  
Divalent Cations ◽  
Atomic Absorption Spectrophotometry ◽  
Waste Materials ◽  
Absorption Spectrophotometry ◽  
Adsorptive Behavior

Adsorption studies were carried out to test the ability of the Iraqi rice bran (Amber type) to adsorb some metals divalent cations (Cd2+, Co2+, Cu2+, Fe2+, Ni2+, Pb2+, and Zn2+) as an alternative tool to remove these pollutants from water. The Concentrations of these ions in water were measured using flame and flamless atomic absorption spectrophotometry techniques. The applicability of the adsorption isotherm on Langmuir or Freundlisch equation were tested and found to be dependent on the type of ions. The results showed different adsorptive behavior and different capacities of the adsorption of the ions on the surface of the bran. The correlation between the amounts adsorbed and different cation parameters including (electronegativity, ionic radius, and the second ionization potential) were tested. This study showed the applicability of bran, as a cheap and available waste materials, to remove different cations from solution.

Adsorption of some divalent cations from aqueous solution on precipitated silica

1983 ◽  
Vol 79 (10) ◽  
pp. 2311 ◽  
Author(s):  
Gerald C. Bye ◽  
Michael McEvoy ◽  
Mounir A. Malati
Keyword(s):  
Aqueous Solution ◽  
Divalent Cations ◽  
Precipitated Silica
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