scholarly journals Concentration of rhenium from dilute sodium chloride solutions

2008 ◽  
Vol 73 (3) ◽  
pp. 333-339 ◽  
Author(s):  
Dragoljub Lukic ◽  
Jurij Vucina ◽  
Slobodan Milonjic
Keyword(s):  
Sodium Chloride ◽  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Elution Profile ◽  
Experimental Conditions ◽  
Sodium Chloride Solutions ◽  
Low Efficiency ◽  
The Given ◽  
Dowex 1

The conditions for the desorption of rhenium from the anion exchange resin Dowex 1-x8 by HNO3, HCl, H2SO4 and NaOH were determined. The solution (5.0?10-3 mol dm-3 Re in 0.15 mol dm-3 NaCl) was passed through a column containing 0.10 g of the resin. The total sorbed amount of rhenium was 0.20 g/g of the resin. It was then eluted by the corresponding eluent in the concentration range up to about 3.0 mol dm-3. The highest elution efficiency and the most favourable elution profile were found with 3.0 mol dm-3 HNO3. Over 77 % of the sorbed rhenium was found in the first 5 ml of the eluate. Practically all the rhenium was recovered with 20 ml of the acid. Under the given experimental conditions, HCl and H2SO4 were less favourable while NaOH was not applicable, due to very low efficiency of rhenium elution.

Improved thyroxine radioimmunoassay, for filter paper discs saturated with dried blood.

1976 ◽  
Vol 22 (11) ◽  
pp. 1912-1914 ◽  
Author(s):  
M L Mitchell
Keyword(s):  
Anion Exchange ◽  
Filter Paper ◽  
Large Scale ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Clinical Signs ◽  
Excellent Correlation ◽  
Experimental Conditions ◽  
Large Scale Screening

Abstract I describe an improved procedure for estimating thyroxine in dried blood on 0.32-cm filter paper discs, by radioimmunoassay. A weak anion-exchange resin is used to separate free and antibody-bound radiothyroxine and, by measuring the resin-bound 125I-labeled thyroxine rather than the supernatant radioactivity, a tedious and cumbersome step is eliminated. The unique properties of the resin permit considerable latitude in the experimental conditions, in contrast with charcoal, without compromising sensitivity or precision. There is excellent correlation between thyroxine values obtained from discs and those of the corresponding plasmas. Application of this procedure for large-scale screening of newborns has proved to be highly successful in identifying thyroid insufficiency in several babies before clinical signs were apparent.

THE CHROMATOGRAPHIC DETERMINATION OF GLUTAMIC, ASPARTIC, AND CYSTEIC ACIDS USING AN ANION EXCHANGE RESIN

1957 ◽  
Vol 35 (1) ◽  
pp. 1249-1258
Author(s):  
A. M. Marko
Keyword(s):  
Amino Acids ◽  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Chromatographic Determination ◽  
Acetate Buffer ◽  
Cysteic Acid ◽  
Acidic Amino Acids ◽  
Normal Urine ◽  
Dowex 1

Optimum conditions for the separation of the acidic amino acids glutamic, aspartic, and cysteic on an anion exchange resin, Dowex-1 × 8, have been studied. The sample to be analyzed is adjusted to pH 7 and placed on a column of Dowex-1 × 8 previously equilibrated with 0.1 M acetate buffer at pH 4. Glutamic and aspartic acids are separated by elution with 0.1 M acetate buffer at pH 4.0–4.6. Cysteic acid is eluted with 0.2 M acetate buffer at pH 5.5–5.9. With this method quantitative separation of synthetic mixtures of the acidic amino acids has been achieved. This method has also been used to determine the dicarboxylic amino acids in acid hydrolyzates of various proteins, of normal protein-free plasma, and of normal urine.

High cadmium-109 recovery from a dissolved silver target solution using dowex 1×8 anion-exchange resin

2010 ◽  
Vol 52 (5) ◽  
pp. 565-569 ◽  
Author(s):  
M. Sadeghi ◽  
M. Mirzaii ◽  
Z. Gholamzadeh ◽  
P. Sarabadani ◽  
A. Sattari
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Silver Target ◽  
Dowex 1

THE CHROMATOGRAPHIC DETERMINATION OF GLUTAMIC, ASPARTIC, AND CYSTEIC ACIDS USING AN ANION EXCHANGE RESIN

1957 ◽  
Vol 35 (12) ◽  
pp. 1249-1258 ◽  
Author(s):  
A. M. Marko
Keyword(s):  
Amino Acids ◽  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Chromatographic Determination ◽  
Acetate Buffer ◽  
Cysteic Acid ◽  
Acidic Amino Acids ◽  
Normal Urine ◽  
Dowex 1

Optimum conditions for the separation of the acidic amino acids glutamic, aspartic, and cysteic on an anion exchange resin, Dowex-1 × 8, have been studied. The sample to be analyzed is adjusted to pH 7 and placed on a column of Dowex-1 × 8 previously equilibrated with 0.1 M acetate buffer at pH 4. Glutamic and aspartic acids are separated by elution with 0.1 M acetate buffer at pH 4.0–4.6. Cysteic acid is eluted with 0.2 M acetate buffer at pH 5.5–5.9. With this method quantitative separation of synthetic mixtures of the acidic amino acids has been achieved. This method has also been used to determine the dicarboxylic amino acids in acid hydrolyzates of various proteins, of normal protein-free plasma, and of normal urine.

In Vitro Evaluation of Heparin Adsorption During Haemoperfusion with Dowex 1×2 Anion Exchange Resin

1995 ◽  
Vol 23 (1) ◽  
pp. 101-108
Author(s):  
M. Fini ◽  
G. Giavaresi ◽  
M Spighi ◽  
R. Giardino ◽  
M. L. Florio
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
In Vitro Evaluation ◽  
Dowex 1

Highly efficient separation of ruthenium from alkaline radioactive feeds using an anion exchange resin

2020 ◽  
Vol 108 (8) ◽  
pp. 603-613 ◽  
Author(s):  
Parveen Kumar Verma ◽  
Prasanta Kumar Mohapatra
Keyword(s):  
Anion Exchange ◽  
Alkaline Medium ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Solid Phase ◽  
Alkaline Media ◽  
Anionic Complex ◽  
Back Extraction ◽  
Column Studies ◽  
Experimental Conditions

AbstractRuthenium recovery from the alkaline media was attempted using solid phase extraction. UV-Vis and X-ray absorption studies were performed to understand the ruthenium speciation under different conditions relevant to its extraction from alkaline medium. Since Ru forms anionic complex in the alkaline solution, an anion exchange resin (Dowex 1x8) was selected for its recovery from alkaline media. The precipitation of black RuO2 at the resin surface hinders its back exaction. Experimental conditions were optimized for the quantitative uptake of Ru from alkaline feed and its subsequent back extraction by a series of batch studies. About 90 % of the Ruthenium was back extracted from the resin using alkaline hypochlorite solution and nitric acid solution at different stages in the Ru back extraction cycle. The column studies were done under the optimized condition and showed ~80 % Ru recovery with 5 mL of the eluent (8 M HNO3) and ~90 % recovery in 10 mL including the tailing. The mechanism for the ruthenium extraction from alkaline medium and its back extraction from the resin was proposed.

scholarly journals Removal of Chromium(VI) from Aqueous Solution using a Strong base Anion Exchange Resin : Kinetic and Equilibrium Studies

2021 ◽  
Author(s):  
HARISH NAGESH REVANKAR ◽  
PRASANNA S KOUJALAGI ◽  
VIJAYENDRA R GURJAR ◽  
RAVIRAJ M KULKARNI
Keyword(s):  
Aqueous Solution ◽  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Exchange Process ◽  
Maximum Adsorption Capacity ◽  
Experimental Conditions ◽  
Equilibrium Studies ◽  
Strong Base ◽  
Chromium Vi

Abstract The removal of chromium (VI) from aqueous solution using the strong base anion exchange resin Tulsion A-62 (MP) is reported in this study under a variety of experimental conditions, including initial chromium (VI) concentration, contact time, and medium pH. The ion-exchange process for the resin Tulsion A-62 (MP) was relatively simple and after 300 minutes of phase contact, the equilibrium was achieved. The sorption process, which is pH based, extracted the most chromium (VI) when the pH was between 4.0 and 5.0. Both Langmuir and Freundlich adsorption isotherms were used to fit the equilibrium results for Cr(VI) adsorption, however Langmuir isotherm model was found to be more acceptable for the Cr(VI) adsorption and maximum adsorption capacity of Cr(VI) was found to be 201.6 mg/g. Scanning Electron Microscopy with EDX and Fourier transformed infrared spectroscopy were also used to characterize Tulsion A-62 (MP) before and after chromium adsorption. The adsorption mechanism followed reversible first-order kinetics. The findings showed that such anion-exchange resins can be used to effectively extract chromium (VI) ions from water and wastewater.

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