scholarly journals Isolation and radiochemical purification of samarium isotopes using ion exchange resins АВ 17×8 AND KU-2

2021 ◽  
Vol 21 (4) ◽  
pp. 368-377
Author(s):  
Sayan E. Salmenbayev ◽  
◽  
Nazgul K. Nurgaysinova ◽  
Gani M. Yessilkanov ◽  
Аray E. Temirzhanova ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Chemical Elements ◽  
Cation Exchange Resin ◽  
Internal Exposure ◽  
Ion Exchange Resins ◽  
Exchange Resins

The relevance of the research is caused by the need to develop a methodological base for determining 151Sm content in the soil cover of radioactively contaminated territories of Kazakhstan. The developed method for the determining of 151Sm will make it possible to assess the levels of soil contamination with this radionuclide, to determine the character of its spatial distribution, to allow estimating the internal exposure doses for the personnel and the population. The aim of the research is to carry out the isolation and radiochemical purification of samarium isotopes from acid solutions via using ion-exchange resins AV 17×8 and KU-2. Objects: salt solutions based on nitric and hydrochloric acid containing the stable isotopes of some natural, artificial β-emitters and isotopes of U and Th. The concentrations of nitric and hydrochloric acids were equal to the concentrations of the same acids used in the routine analysis of Pu and Am. Concentrations of chemical elements were determined using the Agilent 7700x quadrupole mass spectrometer and the iCAP 6300 Duo atomic emission spectrometer. The results of the experiments on the isolation and radiochemical purification of samarium isotopes from acidic solutions using anion-exchange resin AV 17×8 and cation-exchange resin KU-2 have been presented. It has been shown that the Sm-fraction can be purified from alkaline elements, Tl and U isotopes using the KU-2 cation-exchange resin. In turn, the isotopes U, Fe and Co can be removed using an anion exchange resin in 9M HCl media.

The Inactivation of Plasma-Thromboplastin

1958 ◽  
Vol 02 (03/04) ◽  
pp. 324-341 ◽  
Author(s):  
E Deutsch ◽  
E Mammen
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Ammonium Sulfate ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Ion Exchange Resins ◽  
Morbus Addison ◽  
Serum Factors ◽  
The Difference ◽  
Exchange Resins

Summary1. Anti-plasmathromboplastin activity is found in plasma and in serum.2. The anti-plasmathromboplastin activity was increased in the majority of patients with hemophilia A and B, with chronic idiopathic thrombocytopenia, uremia, and in the cases of obstetrical afibrinogenemia, obstructive jaundice and Morbus Addison examined. It was reduced in patients with hepatitis and with cirrhosis of the liver.3. The anti-plasmathromboplastin of serum is stable on storage; it is inactivated at temperatures over 60° C; it is partially adsorbed on the ion exchange resins ICR 50 and XE 64; it is not adsorbed on BaSO4, Al2O3, Al(OH)3, Kaolin and asbestos filter pads; its activity is increased after treatment with the ion exchange resin XE 88. It is not dialysable and not soluble in ether. It inactivates plasmathromboplastin gradually. After repeated additions of plasmathromboplastin its activity is exhausted.4. Two materials with anti-plasmathromboplastin activity could be separated by fractionation with ammonium sulfate, with ethanol or by changing the pH. These two materials differ in their physical properties and in their mode of action.Anti-plasmathromboplastin I is precipitated with 33% saturated ammonium sulfate, with 15% saturation with ethanol, or at pH 6.0; it is unstable on storage, it is inactivated at 70° C; it is partially adsorbed on the cation exchange resins XE 88 and ICR 50, and completely on XE 64. It inactivates plasmathromboplastin gradually. It is more stable, when oxygen is absent or cystein is added.Anti-plasmathromboplastin II remains in solution after 80% saturation with ammonium sulfate, 53.3% saturation with ethanol, or at pH 5.0. It is storage and heat stable; it is dialysable; it is not adsorbed on cation exchange resin ICR 50; its activity is increased by treatment with ion exchange resins XE 64 and XE 88. Its action is immediate,Both anti-plasmathromboplastins migrate with the α-globulin-fraction.5. The anti-plasmathromboplastin has no phosphatase activity. It does not inactivate platelet equivalents before they have reacted with plasma and serum factors to form plasmathromboplastin. Its action seems to be stoichiometric. The action is not influenced by calcium concentrations in a range from 3 to 14 mg%.6. The difference in the degree of inactivation of plasmathromboplastin with the use of our method as compared to the method of E g l i is due to the difference in the proportions of plasmathromboplastin and anti-plasmathromboplastin used in the tests.

Use of weak cation exchange resin Lewatit S 8528 as alternative to strong ion exchange resins for calcium salt removal

2010 ◽  
Vol 97 (4) ◽  
pp. 569-573 ◽  
Author(s):  
Mónica Coca ◽  
Silvia Mato ◽  
Gerardo González-Benito ◽  
M. Ángel Urueña ◽  
M. Teresa García-Cubero
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Calcium Salt ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Ion Exchange Resins ◽  
Weak Cation Exchange ◽  
Exchange Resins

scholarly journals Extraction of Ascorbic Acid from Acerolas (Malpighia punicifolia L.)

1969 ◽  
Vol 39 (4) ◽  
pp. 184-189
Author(s):  
R. Santini, Jr. ◽  
J. Nevarez
Keyword(s):  
Ascorbic Acid ◽  
Anion Exchange ◽  
Dilute Hydrochloric Acid ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Cation Exchange Resin ◽  
Ion Exchange Resins ◽  
Anion Exchange Column ◽  
Commercial Process ◽  
Exchange Resins

The acerola is considered to be the best natural source of ascorbic acid, it yields from two to four crops during the year, and the ascorbic acid is found dissolved in the juice. Therefore, a method which was used previously for separating and crystallizing the ascorbic acid present in the green walnut hulls, but which could not be applied commercially thereto, has been modified and applied to the acerola. The method involved the use of ion-exchange resins. A cation-exchange resin was used to lower the pH below 2 and an anion-exchange resin to absorb the ascorbic acid. This acid was eluted from an anion-exchange column with a dilute hydrochloric acid Solution. On a laboratory scale the yields obtained were relatively high and in a continuous commercial process the yield should be about 88 percent.

Exchangeable Cations and Picloram Sorption by Soil and Model Adsorbents

Weed Science ◽  
1979 ◽  
Vol 27 (3) ◽  
pp. 257-262 ◽  
Author(s):  
J. S. Arnold ◽  
W. J. Farmer
Keyword(s):  
Cation Exchange ◽  
Anion Exchange ◽  
Equilibrium Solution ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Cation Exchange Resin ◽  
Adsorptive Capacity ◽  
Solution Ph ◽  
Exchange Complex ◽  
Polyvalent Cations

The adsorption of picloram (4-amino-3,5,6-trichloropicolinic acid) was determined on an Aiken silt loam, on three cation exchange resins and on a single anion exchange resin. Adsorption data were evaluated using parameters in the Freundlich equation and their dependance upon cationic composition of the exchange complex, the ionic composition of the equilibrium solution, and the equilibrium solution pH. For the Aiken soil saturated with metallic cations the order of decreasing picloram adsorptive capacity was Fe+3= Cu+2> Al+3> Zn+2> Ca+2> native soil. Increases in adsorption compared to the native Aiken soil could be explained on the basis of decreases in the equilibrium solution pH except for Fe+3, Zn+2, and especially the Cu+2treatments. The adsorptive capacity of the Aiken soil was altered by the addition of several salts simulating addition of fertilizer salts. The Cu+2and Zn+2salts were the only treatments showing increased adsorption which could not be explained readily by pH changes. KH2PO4and NH2CONH2(urea) reduced picloram adsorption. Dowex 50-1 × 4, a strongly acidic cation exchange resin, showed increased picloram adsorptive capacity in the order Cu+2> Al+3> Ca+2> Zn+2= H+. Cellex CM, a weakly acidic cellulose exchanger had increased adsorptive capacities in the order of Cu+2> Ca+2> Al+3> Na+> Fe+3> Zn+2. Picloram adsorption by an anion exchange resin at pH 6.1 was nearly 100%. These results suggest that complex formation of picloram with polyvalent cations on the exchange complex is likely especially for Cu+2and to a lesser extent Fe+3and Zn+2. In soils such complex reactions would most probably involve organic matter, polyvalent cations, and picloram. The formation of chelate ring species is proposed.

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