Methods for calculating equilibria in complexation of metal ions with ion exchangers

1986 ◽  
Vol 21 (6) ◽  
pp. 661-666 ◽  
Author(s):  
A. P. Filippov
Keyword(s):  
Metal Ions ◽  
Ion Exchangers

Novel multifunctional ion exchangers for metal ions removal in the presence of citric acid

Chemosphere ◽  
2020 ◽  
Vol 251 ◽  
pp. 126331 ◽  
Author(s):  
Katarzyna Araucz ◽  
Andreas Aurich ◽  
Dorota Kołodyńska
Keyword(s):  
Citric Acid ◽  
Metal Ions ◽  
Ion Exchangers ◽  
Metal Ions Removal

Revisiting syntheses of Ti(iv)/H2PO4–HPO4 functional ion-exchangers, properties and features

2018 ◽  
Vol 42 (2) ◽  
pp. 838-845 ◽  
Author(s):  
Mylène Trublet ◽  
Daniela Rusanova ◽  
Oleg N. Antzutkin
Keyword(s):  
Metal Ions ◽  
Divalent Metal ◽  
Ion Exchanger ◽  
Divalent Metal Ions ◽  
Ion Exchangers ◽  
Strong Affinity

Systematic and readily obtainable ion-exchanger, TiO(OH)(H2PO4)·H2O, with excellent Na+ uptake and strong affinity towards divalent metal ions.

Sorption of Some Metal Ions on Inorganic Electron and Ion Exchangers Based on Zirconium(IV)

2005 ◽  
Vol 78 (8) ◽  
pp. 1266-1269
Author(s):  
T. S. Bondarenko ◽  
E. S. Boichinova
Keyword(s):  
Metal Ions ◽  
Ion Exchangers

scholarly journals SCHEMES OF SOLID-PHASE SPECTROPHOTOMETRIC ANALYSIS OF FOOD OBJECTS

2018 ◽  
Vol 3 ◽  
pp. 33-40
Author(s):  
Elizaveta Kostenko ◽  
Elena Butenko ◽  
Larisa Arseneva
Keyword(s):  
Detection Limit ◽  
Metal Ions ◽  
Solid Phase ◽  
Food Products ◽  
Ion Exchangers ◽  
Standard Samples ◽  
Limit Values ◽  
Standard Methods ◽  
Relative Standard

The aim of research is development of approaches to the development of schemes for microelement analysis of food objects. This will make it possible to monitor food quality by simple and affordable methods in factory laboratories. Based on data on the immobilization of dyes on ion exchangers and on the interaction of metal ions or their complexes with immobilized dyes, solid-phase spectrophotometric (SPS) and photometric methods for determining metal ions in food technology, biotechnology and the environment have been developed. Techniques are sensitive. High distribution coefficients (D³104 cm3/g) of metal ions help to reduce the detection limit when using immobilized dye as compared to the reaction in solution. Based on the detection limit values (DLV), the proposed sorption-spectrophotometric methods for determining metal ions are second only to the atomic absorption (AAS) determination of Cd (II) and Hg (II) ions and the polarographic determination of Cd (II) ions. However, the proposed methods for the determination of these metal ions are sufficient for the determination of Cd (II) and Hg (II) ions in food products at the MPC level. In the case of determination of Pb (II), Zn (II), Cu (II), Fe (III) ions, the developed methods have advantages over standard methods for determination of metal ions in food products, since they make it possible to determine these ions at a level ≤0.1…0.5 MPC; Ion exchangers with immobilized dyes and solid-phase spectrophotometric determination methods with their participation are environmentally safe, since they do not require the use of toxic organic reagents; are simple in execution and economically advantageous because of the low cost of used materials and reagents. The correctness of the results of the determination by the developed methods is proved: by comparison with the results of determinations on standard methods at various analysis objects using the method of additives, standard samples. The relative standard deviation of the developed SPS determination procedures does not exceed 0.10, which indicates satisfactory reproducibility of the results. The developed methods exceed the majority of standard and best analogs, known from the literature, for sensitivity and selectivity. The used methods of analysis are characterized by the simplicity of the experiment, ecological safety, do not require special expensive equipment, highly qualified personnel and a stationary laboratory.

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