Conductometric Study of Calcium(II), Strontium(II), and Barium(II) Perchlorates in Methanol–Ethylene Glycol Mixtures

Doe, Hidekazu; Ohe, Hiroshi; Matoba, Hiroyuki; Ichimura, Akio; Kitagawa, Toyokichi

doi:10.1246/bcsj.63.2785

Cited by 19 publications

(10 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This increased attraction is manifested as an increase in the magnitude of ion pairing between these charges and the formation of new pairs such as triple pairs that would not otherwise form in aqueous solutions. The most widely used standard methods for the determination of association constants include potentiometry (e.g., Doe et al, 1987;Gaizer et al, 1985;Mui and McBride, 1974;Višić et al, 1993Višić et al, , 1994Višić and Makjević, 1996b;Višić et al, 1999), spectrophotometry (Ghasemi et al, 2002), conductometry (e.g., D'Aprano et al, 1993;Doe et al, 1990;Evers and Knox;Gregorowicz et al, 1998Gregorowicz et al, , 1999Niazi et al, 1993aNiazi et al, , 1993bSokol et al, 2005;Srour and McDonald, 2008a), and ion-exchange equilibrium methods (Morris and Short, 1961;Patil and Sharma 1968;Pesavento and Alberti, 2000). Other methods such as specific ion electromotive force (EMF) measurements , NMR, and polarography are used under specific circumstances (Martell and Motekaitis, 1992).…”

Section: Ion Pairing and Complexation Effectsmentioning

confidence: 99%

“…If log K A varies linearly with 1/ε r , pairing is assumed to result solely from electrostatic interactions (Ananthaswamy et al, 1979;Hawes and Kay, 1965;Mui and McBride, 1974;Višić et al, 1993Višić et al, , 1994Višić and Mekjavić, 1996b;Višić et al, 1999). If not, specific solvent-solute interactions are invoked (Doe et al, 1990). Xue and Traina (1996b) observed increased stability of Cu 2+ and EDTA complexes in Ac + and MeOH + H 2 O mixtures as the fraction of solvent or water increased.…”

Section: -Prohmentioning

confidence: 99%

See 1 more Smart Citation

Solution Properties of Inorganic Contamination in Mixed Solvents: Theory, Progress, and Limitations

Srour¹,

McDonald

2011

Critical Reviews in Environmental Science and Technology

View full text Add to dashboard Cite

Most of what is known about the environmental fate and transport of contaminants comes from studies of dilute, aqueous solutions. Theoretical and practical aspects of hydrophobic organic contaminants in aqueous mixtures of organic solvents are well developed, but relatively little attention has been paid to those situations where inorganic contaminants such as metals, water, and organic solvents occur simultaneously. The authors discuss changes in solution properties accompanying the addition of organic solvents. They review more than 500 references to available data on ion solvation, solubility, activity, acidity, pairing, and pH in electrolyte and electrolyte-free solvent mixtures and tabulate selected experimental values. Whenever available, equations developed to estimate these properties are given and their applications and limitations described. The implications of the progress in mixed-solvents solution chemistry on contaminant behavior and transport are described. Major limitations to the study of inorganic contamination in mixed solvents include the absence of complete and comprehensive data (e.g., type of ionic species, activity coefficients, solubility constants) that characterize solute and solvent properties in these mixtures and the indefinite number of possible solute and solvent combinations. The generation of models predicting such data from easily measured benchmark solute and solvent properties is a major challenge. The availability of such database and models may open the field for environmental engineers and soil scientists to study the basic chemical processes and mechanisms of metal contamination in complex multicomponent systems.

show abstract

Section: Ion Pairing and Complexation Effectsmentioning

confidence: 99%

Section: -Prohmentioning

confidence: 99%

Solution Properties of Inorganic Contamination in Mixed Solvents: Theory, Progress, and Limitations

Srour¹,

McDonald

2011

Critical Reviews in Environmental Science and Technology

View full text Add to dashboard Cite

show abstract

“…If log K A varies linearly with 1/ε r , pairing is assumed to result solely from electrostatic interactions (Hawes and Kay, 1965;Mui and McBride, 1974;Ananthaswamy et al, 1979). If not, specific solvent-solute interactions are invoked (Doe et al, 1990). Xue and Traina (1996b) observed increased stability of Cu(II) and EDTA complexes in acetone and methanol water mixtures as the fraction of solvent/water increased.…”

Section: Complexationmentioning

confidence: 99%

“…The most widely used standard methods for the determination of association constants include potentiometry (Gaizer et al, 1985;Doe et al, 1987;Mui and McBride, 1974), spectrophotometry (Ghasemi et al, 2002) and conductometry (Evers and Knox, 1951;Doe et al, 1990). Other methods such as specific ion EMF measurements, nuclear magnetic resonance (NMR), and polarography are used under specific circumstances (Martell and Motekaitis, 1992).…”

Section: Complexationmentioning

confidence: 99%

See 1 more Smart Citation

Metal -surface reactions in mixed aqueous organic solvents

Srour¹

View full text Add to dashboard Cite

The effect of mixed aqueous-organic solvents on exchange and adsorption reactions onto clay minerals is examined in this study while accounting for the effect of cosolvents on metal solution properties, ionic activity and complexation. In the absence of published values, a determination of the primary association constant of selected ions in solution was conducted using conductometric methods. These stability constant values were used to correct for ion-pairing in the exchange and the adsorption experiments. A spectrophotometric determination of pH was accomplished through the quantification of the conditional dissociation constants, s K I , of two indicators (methyl red and phenol red) at constant ionic strength and at 25 o C±2.0 in ethanol and methanol-water mixtures. In these mixtures and under these conditions, solution pH was determined from measurements of the indicator absorbance ratios at two wavelength λ HIn and λ In-within the range 4.5≤pH≤8.5. Calcium-sodium exchange on Wyoming bentonite in methanol, ethanol and acetone-water systems were investigated at constant total chloride concentration and at room temperature. In all treatments, Ca-Na exchange in cosolvents was a surface-controlled phenomenon involving electrostatic and specific solvent-surface interactions. The effect of cosolvents on Cd and Zn sorption to Ca-saturated bentonite and illite in mixed alcohol-water systems at low ionic strength and low initial metal concentration in the presence of nitrate varied between metals. Cd 2+ sorption to bentonite and illite was independent of the solvent dielectric constant suggesting a specific mechanism for Cd 2+ sorption involving inner-sphere complexes with the surface edge sites. Zn 2+ sorption to both clay minerals was strongly dependent on ε r with both increases (illite) and decreases (bentonite) in retention observed with decreased ε r. Although it is not yet possible to predict the effects of cosolvents on metal-surface reactions, it is clear that cosolvents can affect metal concentrations in solution, and therefore contaminant transport (increased hydraulic conductivity resulting from flocculation as Ca 2+ replaces Na + , and hence greater risk of clay liners failure). Additional study is needed on the effects of cosolvents on surface charge density, changes in the interlayer spacing, surface acidity and pH changes before and after sorption. I would like to express my gratitude to Mr. Nicholas Salazar, Ms. Monica Lecaros and Mr. Sunny Baidwan for their encouragement and support. I don't know how to thank Ms. Lina Gomez for being my friend and my family in all the good and the bad times.

show abstract

Ion‐Solvent Interaction of Biunivalent Electrolytes in Dioxane‐Water Mixtures from Conductivity Data at Different Temperatures

Bakr

Mohamed

1999

J Chinese Chemical Soc

View full text Add to dashboard Cite

This paper presents the conductivity measurements for some alkaline earth metal salts MgCl2, MgBr2, Mg(NO3)2, CaCl2, CaBr2 and Ca(NO3)2 by which the ion‐solvent interactions are reported in the concentration range in dioxane‐water mixtures at mass fraction of 0, 3, 10, 20 and 30% at 30°, 35°, 40° and 45°C ± 0.01. The conductance data were analyzed for the limiting molar conductivity, Ao, by the Fuoss‐Edelson conductivity equation for the 2:1 unsymmetrical electrolytes. The results were discussed in terms of the solute‐solvent interaction from the temperature coefficient of Walden product, Λoη of the electrolyte solutions. Moreover, Λoη was found to exhibit a linear relationship with the dielectric constant, ϵ, of the dioxane‐water mixtures. The study gives information regarding the ion‐solvent interactions from the mobilities and Walden product of the ions in the solvent. The ions appear to interact appreciably and the ion‐solvent interaction tends to increase in the order Ca > Mg for the same anion while for the anions, the trend decreases in the order Cl− < Br− < No−3.

show abstract

Conductometric Study of Calcium(II), Strontium(II), and Barium(II) Perchlorates in Methanol–Ethylene Glycol Mixtures

Cited by 19 publications

References 20 publications

Solution Properties of Inorganic Contamination in Mixed Solvents: Theory, Progress, and Limitations

Solution Properties of Inorganic Contamination in Mixed Solvents: Theory, Progress, and Limitations

Metal -surface reactions in mixed aqueous organic solvents

Ion‐Solvent Interaction of Biunivalent Electrolytes in Dioxane‐Water Mixtures from Conductivity Data at Different Temperatures

Contact Info

Product

Resources

About