Sensing film ion selective electrode prepared by film dropping method

Abstract

The invention relates to a blood gas electrolyte analyzer, in particular to a sensing film ion selective electrode in the blood gas electrolyte analyzer. The sensing film ion selective electrode comprises an electrode chamber and an electrode core, wherein the electrode core comprises a contact, a Ag / AgCl wire, an installation head and an O-shaped ring a; the contact is connected with the Ag / AgCl wire in a welding manner and is adhered to the installation head by epoxy resin; the O-shaped ring a is sleeved in a groove of the installation head; the electrode chamber comprises a pressure ring, a PVC (Poly Vinyl Chloride) ring, a sensing film, an electrode body and an O-shaped ring c; the sensing film is prepared by dropping prepared corresponding film liquid into the PVC ring; and when the sensing film ion selective electrode is assembled, the PVC ring in which the sensing film is formed is placed into an electrode body chamber in the direction that the side of the final layer of dropped film is downwards, then the pressure ring is placed in the electrode body, the pressure ring is pressed to a designated position to fix the sensing film, the O-shaped ring c is sleeved in a groove at the lateral surface of the electrode body, electrode inner liquid is filled in the electrode chamber and the electrode core is screwed into the electrode body chamber so as to form the sensing film ion selective electrode prepared by a film dropping method.

Description

technical field [0001] The invention relates to a blood gas electrolyte analyzer, in particular to a sensing membrane ion selective electrode in the blood gas electrolyte analyzer. Background technique [0002] Electrolytes play an important role in maintaining the balance of the internal environment and normal physiological functions of the human body. Plasma sodium accounts for 92% of total plasma ions and 90% of osmotic pressure, so plasma sodium plays a decisive role in osmotic pressure and is regulated by hypothalamus, posterior pituitary and kidney. Potassium accounts for 98% of the total in cells, and it is of great significance in maintaining the osmotic pressure of intracellular fluid, capacity and substance metabolism, acid-base balance, stress of neuromuscular cell membranes, and maintaining the normal function of myocardium. Cl is the main anion in the extracellular fluid, and Ca ions are the main constituents of bones, which regulate muscle contraction and bloo...

AI Technical Summary

Problems solved by technology

In this method, the membrane solution is directly dropped into the electrode chamber. Generally, the material of the electrode chamber is plexiglass. Most or all of the solute of the membrane solution is tetrahydrofuran, which can corrode all plastic products. Some additives in the plexiglass material in the electrode cavity will Dissolving into the membrane liquid, such as silicon-containing fillers, will destroy the adsorption of ions by the sensing membrane and affect the performance of the sensing membrane

However, in the structure of the inner cavity of the electrode, the place where the membrane solution is dropped is a conical shape with a hole at the bottom. The membrane formed by the first layer of dripping is just in direct contact with the calibration solution or test solution, which will affect the performance of the electrode.

However, the film loading method generally prefabricates the film, and then presses the film assembly into the electrode body cavity. This method has high requirements for the assembly process, and the film must be pressed in place. If it is too loose, the solution on the inner and outer surfaces of the film will short-circuit. If it is too tight, it will cause the membrane to deform and arch and cannot contact the sample solution. If it is too loose or too tight, the electrode will be scrapped. The success rate of assembly is not as high as that of the drop film method.

Images