Explanation

A device that measures the activity of a specific ion in an electrolyte by using a homogeneous phase membrane, a heterogeneous phase membrane, or a liquid membrane as a separator to have permeability to a certain ion or the potential established by the ion exchange equilibrium between the membrane surface and the electrolyte. The membrane materials in membrane electrode is a kind of selective penetrating membrane: there are inorganic membranes, such as glass membrane, inorganic salt membrane, semiconductor film; Tnacromolecular film, functional molecular fixed membrane, immobilized enzyme membrane, immobilized cell membrane, and immobilized microbial membrane and antigen body membrane; Liquid mold and carrier liquid film. When measuring, it can be divided into two categories based on its changes: the direct conversion of biological changes in the membrane itself while identifying substances; The membrane itself has no physical property changes, but is indirectly convertible when combined with a certain linkage device. membrane electrode is a simple, rapid analytical tool for colored and turbid solutions. The miniaturization of electrodes has been used to directly observe the activity changes of some important ions in body fluids and even cells. It has been successfully used in environmental monitoring, water quality and soil analysis, clinical laboratory testing, marine exploration, industrial process control, as well as geological, metallurgical, agricultural food and drug analysis and other fields.

Classification