Method and device for the determination of substances in...

G - Physics – 01 – N

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G01N 27/49 (2006.01) G01N 27/38 (2006.01)

Patent

CA 2173464

A method for the determination of dissolved substances, in particular oxygen, is described, which is distinguished by an open, diaphragm-free system in a potentiostatic three-electrode arrangement with mechanical self-cleaning. A novel possibility for generating the required reference potential by means of a current-loaded metal electrode offers the option of the employment of the most diverse electrode materials and permits the removal of cross sensibilities in the determination of the dissolved substances. The corresponding apparatus provides the integration of the potentiostat, the electronic controls and the signal processing in one and the same measuring probe. It permits the determination of different analysis media. The method described has its application in technical processing installations, in particular in sewage and potable water processing systems, in food technology, in pharmaceutical technology and in biotechnology, as well as in chemical-technical processes.

L'invention concerne un procédé permettant de déterminer des substances dissoutes, notamment de l'oxygène, qui se caractérise en ce qu'il fait appel à un système sans membrane, ouvert, comprenant un montage potentiostatique de trois électrodes, à autonettoyage mécanique. Selon ce procédé, il est prévu une nouvelle manière de produire le potentiel de référence requis, à l'aide d'une électrode en métal à laquelle est appliqué du courant, ce qui permet d'utiliser les matériaux d'électrode les plus divers et d'éviter les sensibilités croisées lors de la détermination des substances dissoutes. Dans le dispositif correspondant audit procédé, il est prévu d'intégrer le potentiostat, le système électronique de régulation et la préparation préalable du signal dans une seule et même sonde de mesure. Ce dispositif sert à déterminer plusieurs analytes. Ce procédé s'utilise dans des installations industrielles, notamment dans des systèmes de traitement d'eaux usées et d'eau potable, dans l'industrie alimentaire, en pharmatechnologie et en biotechnologie, ainsi que dans des procédés chimico-techniques.

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