Tracer Diffusion and Electric Mobility of Ions in Aqueous Solutions:  A Method for Estimating the Average Charge of Complex Ions

2000 ◽  
Vol 45 (2) ◽  
pp. 324-330 ◽  
Author(s):  
Norman A. Bonner ◽  
Emery H. Willes
Keyword(s):  
Aqueous Solutions ◽  
Tracer Diffusion ◽  
Electric Mobility ◽  
Average Charge ◽  
Complex Ions ◽  
Mobility Of Ions

The Photolysis in Acidic Aqueous Solutions of the Monooxalato-bisethylenediamine Chromium(III) Cation and the Bisoxalatomonoethylenediamine Chromate(III) Anion: Photolysis Modes and Quantum Yields

1971 ◽  
Vol 49 (3) ◽  
pp. 375-383 ◽  
Author(s):  
A. D. Kirk ◽  
K. C. Moss ◽  
J. G. Valentin
Keyword(s):  
Quantum Yield ◽  
Aqueous Solutions ◽  
Quantum Yields ◽  
Ligand Field ◽  
Intersystem Crossing ◽  
Empirical Correlations ◽  
Complex Ions ◽  
Ethylenediamine Complex ◽  
Ethylenediamine Ligand ◽  
Ph Range

The photolysis reactions of the complex ions [Cr(en)2ox]+ and [Cren(ox)2]− have been studied in the pH range 1 → 3 and at temperatures from 0 to 25 °C. It has been found that both ions photoaquate to a monodentate protonated ethylenediamine complex which then undergoes further aquation thermally with loss of the ethylenediamine ligand. Quantum yields for these aquations were measured for irradiation into the ligand field bands, the values obtained being 0.18 and 0.02, respectively. The results are discussed in terms of known empirical correlations for Cr(III) complexes. Assuming these reactions may occur from the 4T2g state as precursor, arguments are presented that the correlation between quantum yield and ΔE may depend on mixing of the 4T2g and 2Eg states, and its effect on the intersystem crossing rate constant.

Formation and Properties of Americium Colloids in Aqueous Systems

1981 ◽  
Vol 6 ◽  
Author(s):  
U. Olofsson ◽  
B. Allard ◽  
K. Andersson ◽  
B. Torstenfelt
Keyword(s):  
Ionic Strength ◽  
Aqueous Solutions ◽  
Storage Time ◽  
Large Fraction ◽  
Average Charge ◽  
Particle Sizes ◽  
Aqueous Systems ◽  
Ph Range ◽  
And Storage ◽  
Solution Changes

ABSTRACTThe formation and sorption properties of colloidal americium in aqueous solutions have been studied with variations of pH (2–12), ionic strength (0.01–1.0 M NaClO4), americium concentration (10−7 −10−11 M) and storage time (6 h–6 months). A large fraction of the americium is sorbed on the container walls or on Al2O3 in the pH-range 7–11. Around pH 5–8 and at pH above 12 centrifugable fractions (particle sizes greater than 100 nm) are obtained. The fraction formed at pH above 12, which seems to be a true hydroxide colloid, migrates through an A12O3-filled column with very little retention. The average charge of americium species in solution changes from positive values at pH below 7–8 to negative values at pH above 10–11, as indicated from electromigration studies.

scholarly journals Use of metallurgical dust for removal chromium ions from aqueous solutions

2018 ◽  
Vol 28 ◽  
pp. 01029 ◽  
Author(s):  
Magdalena Pająk ◽  
Agnieszka Dzieniszewska ◽  
Joanna Kyzioł-Komosińska ◽  
Michał Chrobok
Keyword(s):  
Aqueous Solutions ◽  
Sorption Capacity ◽  
Low Cost ◽  
Steel Plant ◽  
Complex Ions ◽  
Maximum Sorption Capacity ◽  
Chromium Ions ◽  
In Series ◽  
High Sorption ◽  
Effective Sorbent

The aim of the study was to determine the potential for the application of dust from steel plant as an effective sorbent for removing Cr(III) and Cr(VI) in the form of simple and complex ions – Acid Blue 193 dye from aqueous solutions. Three isotherms models were used to interpret the experimental results namely: Langmuir, Freundlich, and Dubinin–Radushkevich. Estimated equations parameters allowed to determine the binding mechanism. Based on laboratory studies it was found that the dust was characterized by high sorption capacities for Cr ions and dye from the aqueous solution. The sorption capacity of the dust for Cr(III) and Cr(VI) ions depended on the degree of oxidation, pH of solution and kind of anion and changed in series: Cr(III)-Cl pH=5.0> Cr(III)-SO4 pH=5.0> Cr(III)-Cl pH=3.0> Cr(III)-SO4 pH=3.0> Cr(VI) pH=5.0> Cr(VI) pH=3.0. Dust was also characterized by a high maximum sorption capacity of dye at a range of 38.2 – 91.7 mg/g, depending on the dose of dust. Based on the study it was found that dust from a steel plant, containing iron oxides, can be used as low-cost and effective sorbent to remove pollutions containing chromium ions, especially from acidic wastewater.

scholarly journals Effect of the Fluidity on the Ionic Tracer Diffusion of Thallium (I) Ion in Aqueous Solutions Containing Hydrophilic Polymers

1981 ◽  
Vol 49 (8) ◽  
pp. 496-502
Author(s):  
Katsuo TAKAHASHI ◽  
Kazuo TSUGAWA ◽  
Yoko MATSUOKA ◽  
Toshiaki ISONO ◽  
Reita TAMAMUSHI
Keyword(s):  
Aqueous Solutions ◽  
Tracer Diffusion ◽  
Hydrophilic Polymers
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