Makarow A.G., Razdobreev D.A., Sagida M.O.
THE EFFECT OF TEMPERATURE ON THE SENSITIVITY OF IRON DITELLURIDE ELECTRODE TO ION H₃O^{+ [№ 10 ' 2015]}
Influence of temperature on ability of iron ditelluride electrode to feel change of concentration of ion H₃O⁺ in solution on the example of acid-base electrometric titration with use of a glass electrode as a standard for measurement of рН, is investigated. Dependences of potential of a ditelluride of iron from рН are constructed and coefficients of an inclination of linear sites in the range of temperatures from 20 to 60 °C are calculated. Influence of temperature (in the specified range) on reversibility of electrode process at consecutive change рН from sour (2–2,5 рН) to alkaline (10–11 рН) areas and back is investigated. It is noted, that divergences between two branches of titration increase (towards increase of values рН) from 20 to 40 °C, and then to 60 °C considerably decrease. From the point of view of reversibility of electrode process, the best results were received at 20, 55 and 60 °C. Existence of an alkaline mistake of iron ditelluride electrode at value рН more than 10.5. Differential curves titration are constructed at various temperatures, and correlation of the received peaks with indicators of constants of ionization of the acids, which are a part of titrable mix (acetic, phosphoric, boric acids), is executed. The studied electrode on a basis of a ditelluride of iron, unlike traditionally used glass electrode, doesn't demand application of a thermal compensator for measurement рН at various temperatures, and also possesses quite inert surface which isn't losing mirror gloss at contact with sour or alkaline solutions, water and air for a long time.

Makarov A.G., Razdobreev D.A., Sagida M.O.
SENSORS PH ON THE BASIS CHALCOGENIDES OF IRON ^{[№ 6 ' 2014]}
The behavior the electrodes on the basis chalcogenides of iron of structure of FeS₂, FeSe₂ and FeTe₂ at change of concentration of H₃O⁺-ion in solution have been investigated. Shows the advantages and disadvantages of the electrodes in compari-son with commonly used glass electrode.Tilt of electrode functions in the range рН from 3 to 11 are defined. Describes practical application of the investigated elec-trodes for example titration hydrochloric, sulfuric and phosphoric acids.