Potassium selective electrode

E. Lindner, K. Toth, M. Horvath, E. Pungor, B. Agai, I. Bitter, L. Toke, and Z. Hell, Bis-crown ether derivatives as ionophores for potassium selective electrodes. Fres. Z. Anal. Chem. 322, 157-163 (1985). 

H.A. Arida and R.F. Aglan, A solid-state potassium selective electrode based on potassium zinc ferro-cyanide ion exchanger. Anal. Lett. 36, 895-907 (2003). 

D. Engel and E.W. Grabner, Copper hexacyanoferrate-modified glassy carbon a novel type of potassium-selective electrode. Ber. Bunsenges. Phys. Chem. 89, 982—986 (1985). 

C. Gabrielli, P. Hemery, P. Liatsi, M. Masure, and H. Perrot, An electrogravimetric study of an all-solid-state potassium selective electrode with Prussian blue as the electroactive solid internal contact. J. Electrochem. Soc. 152, H219 (2005). 

Salts, in addition to causing the soil to be basic, can have deleterious effects on analytical procedures. For example, significant error can occur if a potassium-selective electrode is used to determine potassium in a high-sodium soil (see Chapter 9). As discussed in Chapter 14, other salts could cause inaccurate results when atomic absorption analysis of a soil extract is carried out. 

Perhaps the most used substance in biophysical ion-transport experiments is valinomycin, (VIII), which is also the basis of potassium-selective electrodes (63), It is a cydododecadepsipeptide (64), [D-valine,... 

In the case of a neutral non-ionic chelating agent we have neutral carrier-selective electrodes transport is achieved by selective complexa-tion of certain ions. The best-known electrode of this kind is the potassium-selective electrode, whose membrane consists of a valinomycin macrocycle immobilized in phenylether. The important criterion appears to be the size of the cavity in the centre of the macrocycle and interferences are from cations with similar hydrated ionic radius, such as Rb+ and Cs+. 

For example, potassium-selective electrodes can be constructed with the natural macrocycle valinomycin as a neutral carrier in diphenyl ether. This membrane has a much... 

Calcium and potassium selective electrodes have a sensing membrane made of poly(vinyl chloride) (PVC) containing a ligand that forms a complex with the cation. The membrane also contains some additional components. Calcium ISEs are mainly... 

In addition to the Agl electrode, various solid state electrodes and other types like the bis-crown ether-based potassium electrode were studied. Figure 1 shows some results for the silver iodide-based electrode and for the potassium-selective electrode. 

A sohd-state potassium-selective electrode based on potassium zinc hexacyano-ferrates, K2Zn3[Fe(CN)6]2, ion exchanger is described [472]. The sensor can be used in the determination of K+ ion in concentration range 10 —1 M KCl. 

Reference electrode angled near tip positioned close to potassium selective electrode and attached with epoxy and. dental cement. 

The outlook for the application of sodium- and potassium-selective electrodes, carriers with structural formulas... 

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