| 摘要 |
<p>A solid phase ionoselective electrode relates to devices for potentiometrical analysis of ion composition of liquid media. The casing of the electrode consists of a tube (1) of a dielectric material one of the ends of which carries an ionosensitive membrane (2) containing, as additives, La and Nd. The surface of the membrane (2), which faces the hollow of the tube (1) is provided with a solid phase contact (3) made of an oxide compound of the general formula MxLayNdzWO3, where M is an alkali or an alkaline earth metal and where O < x + y + z < 1. Said composition of the membrane (2) and of the contact (3) in the conditions of multiple sterilization with superheated steam at a temperature of up to 143°C allows to maintain the stability of the electrode characteristics due to the restoration of La and Nd ion concentration due to their diffusion from inside the membrane (2) and the contact (3) towards the layer of the membrane (2) neighbouring the solution to be analyzed.</p> |
