Separation of ions of cobalt (II) and iron (III) with use of nonselective sulfonic cation resin KU-2-8

2020 ◽  
Vol 21 (9) ◽  
pp. 474-480
Author(s):  
Svetlana Saykova ◽  
◽  
Marina Panteleeva ◽  
Elena Pikurova ◽  
Diana Saykova ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Separation Method ◽  
Simultaneous Presence ◽  
Cation Resin ◽  
Preliminary Separation

A separation method of ions of cobalt (II) and iron (III) has been proposed and studied for the case of their simultaneous presence in a solution. This method includes preliminary separation of an iron portion by alkaline precipitation with pH = 2.3, obtaining the product of simultaneous precipitation of iron and cobalt and extraction of cobalt from it by the method of cation-exchange leaching with the use of nonselective sulfonic cation resin KU-2-8.

The role of ion-association in the chromatographic separation of isomeric cationic cobalt(III)-amine complexes on cation-exchange resins, particularly SP-Sephadex

1977 ◽  
Vol 30 (12) ◽  
pp. 2625 ◽  
Author(s):  
GH Searle
Keyword(s):  
Cation Exchange ◽  
Ion Pairs ◽  
Sodium Perchlorate ◽  
Ion Association ◽  
Chromatographic Separations ◽  
Sodium Tartrate ◽  
Cation Resin ◽  
Cation Exchange Resins ◽  
Exchange Resins

Chromatographic separations of a set of closely similar or isomeric cobalt(III) complexes, of the kinds [Co(dien)2]3+, [Co(dien)(medien)]3+ and [Co(medien)2]3+ [dien = diethylenetriamine; medien = 4-methyldiethylenetriamine or 2,2'-methyliminodi(ethylamine)] on SP-Sephadex C-25 and Dowex 50W-X2 cation-exchange resins have been examined with different eluents as sodium salts. The separations obtained appear to be due primarily to differences in the association constants for ion-pairs formed betwen the complex cations and the eluent anions, rather than due to differences in affinities of the free cations for the resins. The strengths of the associations depend on: (1) the availability on the complex cations of appropriately disposed N-H bonds for hydrogen-bonding to oxyanions, and probably on the acidities of these hydrogens (acidity sec-NH > NH2), rather than on polarity of charge distribution, and (2) the basicities of anions, in the order PO43- > SeO32- > (+)-tartrate2- > SO42- > (+)-Sb2(C,4H2O6)22- > Cl- ≈ NO3- > ClO4-. The effects of association with PO43-, SeO32- and (+)-tartrate2- may be so great that complex cations of different charges are not necessarily eluted in the order of their increasing charges. Determinations of charges and polarities (cis/trans) of cationic complexes by chromatographic procedures must therefore be carried out under conditions where association is minimized, as with sodium perchlorate as eluent. Under these conditions, separations are determined largely by cation-resin interactions which are less specific and less discriminating than cation-anion interactions. SP-Sephadex is a particularly sensitive medium for separating different cationic complexes, and tri- sodium orthophosphate and sodium (+)-tartrate are the most effective and generally useful eluents.

scholarly journals Silver-containing Cation Exchange Resin: Synthesis and Application

2021 ◽  
Author(s):  
Renat KHAYDAROV ◽  
Murodjon ABDUKHAKIMOV ◽  
Ilnur GARIPOV ◽  
Ilkham SADIKOV ◽  
Praveen Thaggikuppe KRISHNAMURTHY ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Spherical Shape ◽  
Climatic Conditions ◽  
Water Softening ◽  
Biofilm Growth ◽  
Cation Resin ◽  
Resin Beads ◽  
Exchange Resins

Cation exchange resins are widely used for water softening and demineralization all over the world. Deposition, metabolism, and growth of bacteria and fungi on the resin beads cause capacity and performance losses, especially during repeated use in cyclic and long-term operations. Over the last decades, modification of different materials by silver nanoparticles (AgNPs) has demonstrated to present significant opportunities in mitigating biofouling problems. The paper deals with a novel facile technique of introducing silver colloids (AgC) into cation exchange resin, providing the formation of silver micro- and nano-inclusions on the cation resin beads. The scanning electron microscope (SEM) measurements have confirmed a spherical shape and uniform distribution of AgC (50 – 1000 nm) on the surface of the resin. To evaluate the antibacterial and fungicidal properties of AgC on the cation resin beads, we have used Aureobasidium sp., Penicillium sp., and Staphylococcus aureus cultures. AgC coating has proved to efficiently prevent bacteria/biofilm growth on the cation resin beads and thereby significantly increase the service life of the cation exchange resin, especially in hot climatic conditions. Possible antibiofouling mechanisms of the modified nanocomposite cationite have been discussed. Since 2020, the modified silver-containing cationite has been successfully utilized for water softening systems of boiler equipment in Uzbekistan, demonstrating the suitability of the suggested facile coating technique for reducing fouling of cation-exchange resin.

IV. An Improved Separation Method for Twenty two Compounds Related to Purine and 6-Thiopurine Metabolism Using High-Pressure Liquid Cation-Exchange Chromatography

1977 ◽  
Vol 32 (11-12) ◽  
pp. 905-907 ◽  
Author(s):  
Hans-Joachim Breter
Keyword(s):  
High Pressure ◽  
Cation Exchange ◽  
Flow Velocity ◽  
Exchange Resin ◽  
Exchange Chromatography ◽  
Separation Method ◽  
Cation Exchange Chromatography ◽  
Improved Method ◽  
Linear Flow ◽  
Linear Flow Velocity

Abstract An improved method is described for the separation of 22 compounds normally related to purine and 6-thiopurine metabolism in biological materials using high-pressure liquid cation-exchange chromatography on strongly acidic exchange resin. The column (0.18 × 100 cm) is eluted with 0.4 ᴍ ammonium formate, pH 4.6, at a linear flow velocity of 5.2 cm · min-1 at 50 °C. The elution volumes of sulphate anions, allopurinol, 6-thioxanthine, adenine, adenosine, and guanosine are demonstrated additionally to further 16 purine and 6-thiopurine compounds.

The Effectiveness of a Cation Resin (Kayexalate) as an Adsorbent of Paraquat: Experimental and Clinical Studies

1987 ◽  
Vol 6 (1) ◽  
pp. 89-90 ◽  
Author(s):  
M. Yamashita ◽  
H. Naito ◽  
S. Takagi
Keyword(s):  
Survival Rate ◽  
Cation Exchange ◽  
Adsorption Capacity ◽  
Activated Charcoal ◽  
Clinical Studies ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Cation Resin

1 The cation-exchange-resin KayexalateR has an adsorption capacity for paraquat 15 times greater than activated charcoal and 6 times greater than Adsorbin. The oral LD 50 of paraquat in rats rose 2.1 times by intragastric injection of Kayexalate.1 2 In the present study, the survival rate of rats given Kayexalate or Adsorbin after paraquat administration was examined. Results of clinical studies on 22 patients are also presented.

Phase separation in sol gel-derived ceramic films of silica-zirconia, alumina-zirconia, and titania-zirconia system

1994 ◽  
Vol 52 ◽  
pp. 646-647
Author(s):  
J. Tong ◽  
L. Eyring
Keyword(s):  
Fracture Toughness ◽  
Phase Separation ◽  
Sol Gel ◽  
Great Influence ◽  
High Strength ◽  
Chemical Durability ◽  
Separation Method ◽  
Toughening Mechanism ◽  
Ceramic Films ◽  
Zirconia Toughened Alumina

There is increasing interest in composites containing zirconia because of their high strength, fracture toughness, and its great influence on the chemical durability in glass. For the zirconia-silica system, monolithic glasses, fibers and coatings have been obtained. There is currently a great interest in designing zirconia-toughened alumina including exploration of the processing methods and the toughening mechanism.The possibility of forming nanocrystal composites by a phase separation method has been investigated in three systems: zirconia-alumina, zirconia-silica and zirconia-titania using HREM. The morphological observations initially suggest that the formation of nanocrystal composites by a phase separation method is possible in the zirconia-alumina and zirconia-silica systems, but impossible in the zirconia-titania system. The separation-produced grain size in silica-zirconia system is around 5 nm and is more uniform than that in the alumina-zirconia system in which the sizes of the small polyhedron grains are around 10 nm. In the titania-zirconia system, there is no obvious separation as was observed in die alumina-zirconia and silica-zirconia system.

Kinetic Study of the Effect of Heparin on the Amidase Activity of Trypsin, Plasmin and Urokinase

1983 ◽  
Vol 49 (03) ◽  
pp. 199-203 ◽  
Author(s):  
V M Yomtova ◽  
N A Stambolieva ◽  
B M Blagoev
Keyword(s):  
Kinetic Study ◽  
Active Center ◽  
Simultaneous Presence ◽  
Amidase Activity ◽  
Competitive Inhibitors ◽  
Uncompetitive Inhibitor

SummaryIt was found that the effect of heparin on the amidase activity of urokinase (E C 3.4.21.31), plasmin (E C 3.4.21.7) and trypsin (E C 3.4.21.4) depended on the substrate used. No effect of heparin on the amidase activity of urokinase and trypsin was observed when Pyro Glu-Gly-Arg-p-nitroanilide (S-2444) and α-N-acetyl-L-lysine-p-nitroanilide (ALNA) were used as substrates. Heparin acted as a uncompetitive inhibitor of trypsin (Ki = 1.2×10-6 M), plasmin (Ki = 4.9×10-6 M) and urokinase (Ki = l.0×10-7 M) when Bz-Phe-Val-Arg-p-nitroanilide (S-2160), H-D-Val-Leu-Lys-p-nitroanilide (S-2251) and plasminogen, respectively, were used as substrates. These results, as well as the data obtained by studying the effect of the simultaneous presence of heparin and competitive inhibitors suggest that although heparin is not bound at the active center of these enzymes, it may influence the effectivity of catalysis.

The Effect of Calcium and Magnesium on Rabbit Blood Platelet Aggregation in Vitro

1964 ◽  
Vol 12 (01) ◽  
pp. 179-200 ◽  
Author(s):  
Torstein Hovig
Keyword(s):  
Platelet Aggregation ◽  
Cation Exchange ◽  
Calcium Concentration ◽  
Blood Platelets ◽  
Blood Platelet ◽  
Rabbit Blood ◽  
Calcium And Magnesium ◽  
Induced Aggregation ◽  
Blood Platelet Aggregation

SummaryThe effect of calcium and magnesium on the aggregation of rabbit blood platelets in vitro was studied, with the following results:1. Platelet aggregation induced by ADP or collagen could be prevented by EGTA or EDTA. The aggregating effect was restored by recalcification. The effect was also restored by addition of magnesium in EDTA-PRP, but not in EGTA-PRP unless a surplus of calcium was present.2. Calcium remained in concentrations of the order of 0.15–0.25 mM after dialysis or cation exchange of plasma. Aggregation of washed platelets resuspended in such plasma could not be produced with ADP or collagen, unless the calcium concentration was increased or that magnesium was added.3. The adhesiveness of blood platelets to collagen was reduced in EGTA-PRP and EDTA-PRP. Release of ADP from platelets influenced by collagen could not be demonstrated either in EGTA-PRP (presence of magnesium) or in EDTA-PRP.4. It is concluded that calcium is a necessary factor both for the reaction leading to release of ADP and for the the aggregation produced by ADP.5. Thrombin induced aggregation of washed platelets suspended in tris-buffered saline in the presence of calcium. No effect of magnesium could be observed unless small quantities of calcium were present.

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