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Portrait of Werner Ingold. Werner Ingold (20 February 1919 – 24 June 1995) was a Swiss chemist and entrepreneur. He was a pioneer in the field of chemical microanalysis, in particular in the development of glass-based, highly resistive pH electrodes.
The bottom of a pH electrode balloons out into a round thin glass bulb. The pH electrode is best thought of as a tube within a tube. The inner tube contains an unchanging 1×10 −7 mol/L HCl solution. Also inside the inner tube is the cathode terminus of the reference probe.
It is agreed that the main mechanisms are based on desorption induced regeneration as electrochemical effects are confined to the surface of the porous carbons so cannot be responsible for bulk regeneration. [3] [6] The performance of different regeneration methods can be directly compared using the regeneration efficiency. This is defined as:
In aquatic environments, platinum is often used due to its high electron transfer kinetics, [5] although an electrode made from several metals can be used in order to enhance the electron transfer kinetics. [6] The most common potentiometric electrode is by far the glass-membrane electrode used in a pH meter.
Most electrodes work over a limited range of conditions, such as pH or temperature, outside of this range the electrodes behavior becomes unpredictable. The advantage of a pseudo-reference electrode is that the resulting variation is factored into the system allowing researchers to accurately study systems over a wide range of conditions.
In 1992, the company was incorporated as Mettler Toledo, Inc. [9] In 1996–97, Mettler Toledo, Inc. was sold by Ciba-Geigy AG to the New York-based AEA Investors Inc., in preparation for a subsequent initial public offering. The initial public offering was completed and began trading on the New York Stock Exchange, under the ticker symbol NYSE ...
It is the electrode that completes the circuit of the three-electrode cell, as it allows the passage of current. It enables the analysis of processes in which electronic transfer takes place. Screen-printed electrode with the three electrode system, reference electrode (RE), working electrode (WE) and auxiliary or counter electrode (AE or CE)
Beckman Model M pH Meter, 1937 [1] Beckman model 72 pH meter, 1960 781 pH/Ion Meter pH meter by Metrohm. A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH. [2]
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