A deuterium–palladium electrode as a new sensor in non-aqueous media: the potentiometric titration of weak acids in alcohols

Abstract

A deuterium-palladium electrode was employed as a new indicator electrode for the titration of weak acids in tert-butanol and iso-propanol. The investigated electrode showed a linear dynamic response for ptoluenesulfonic acid in the concentration range from 0.1 to 0.001 mol L -1 , with a Nernstian slope of 53.0 mV per decade in tert-butanol. The potential in the course of the titration and at the titration end-point (TEP) was rapidly established. Potassium hydroxide and tetrabutylammonium hydroxide (TBAH) proved to be very suitable titrating agents for these titrations. The response time was less than 10-11 s and the lifetime of the electrode was limitless. The experimental results obtained for the proposed electrochemical sensor and a conventional glass electrode were in good agreement. The advantages of the electrode are longterm stability, fast response, reproducibility, and easy preparation.

Potentiometric Titration of ${\rm NH}_{4}{\rm VO}_{3}$ and ${\rm Na}_{2}{\rm HAsO}_{4}$ in Molten ${\rm NaNO}_{3}$ at 623 K Using a Novel Solid-State Glass/${\rm Nb}_{2}{\rm O}_{5}$ pH Indicator Electrode

“…The method of potentiometric titration using oxygen sensors with solid electrolyte membrane was applied to study the interaction of curium cations with oxygen anions in the molten alkali metal chlorides in the temperature range of 450-850°C depending on oxy-acidity of melt [15]. A deuterium-palladium electrode was employed as a new indicator electrode for the titration of weak acids in tert-butanol and iso-propanol [16]. The polymeric precursor method was used to prepare lowcost solid-state sensors for pH determination based on iridium oxide as the main pH sensitive material.…”