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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]
A glass electrode is a type of ion-selective electrode made of a doped glass membrane that is sensitive to a specific ion. The most common application of ion-selective glass electrodes is for the measurement of pH. The pH electrode is an example of a glass electrode that is sensitive to hydrogen ions.
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.
Commercial reference electrodes consist of a glass or plastic tube electrode body. The electrode consists of a metallic silver wire (Ag (s)) coated with a thin layer of silver chloride (AgCl), either physically by dipping the wire in molten silver chloride, chemically by electroplating the wire in concentrated hydrochloric acid (HCl) [3] or electrochemically by oxidising the silver at an anode ...
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 ...
In 1948, Werner Ingold started to produce glass electrodes for pH measurement, initially as a one-man company operating out of Huttenstrasse 24 in Zurich. Before he devoted himself entirely to the commercialization of pH electrodes, he was contacted by the Imperial Chemical Industries (ICI) Plastics Division to establish a micro-analytical ...
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