Method and apparatus for measuring calcium oxalate scaling

G - Physics – 01 – N

Patent

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G01N 27/42 (2006.01) G01N 27/00 (2006.01) G01N 29/02 (2006.01) G01N 29/22 (2006.01) G01N 29/30 (2006.01) G01N 33/02 (2006.01) G01N 33/18 (2006.01)

Patent

CA 2401881

This invention is directed to a method and apparatus for measuring the rate of calcium oxalate scale formation in a continuously flowing solution having a pH of from about 2 to about 3 comprising measuring the rate of deposition of calcium oxalate scale from the solution on to a quartz crystal microbalance having a top side and a second, bottom side isolated from the solution, wherein the pH of the solution proximate to the microbalance is measured using a pH measuring module and is controlled electrochemically at from about 3.5 to about 9 and wherein the working electrode (23) is coated with or made of a conductive material on which the intensive evolution of hydrogen gas proceeds at potentials more negative than those necessary to achieve a pH of 3.5-9 proximate to the microbalance (2).

La présente invention concerne un procédé et un appareil permettant de mesurer la vitesse de formation du tartre d'oxalate de calcium dans une solution s'écoulant en continu et ayant un pH compris entre 2 environ et 3 environ. Ledit procédé consiste à mesurer la vitesse de dépôt du tartre d'oxalate de calcium de la solution sur une microbalance (2) à quartz comportant une face supérieure et une seconde face, inférieure, isolée de la solution. Ledit procédé est caractérisé en ce que d'une part, le pH de la solution à proximité de la microbalance est mesuré à l'aide d'un module (3) de mesure du pH puis contrôlé électrochimiquement entre 3,5 environ et 9 environ, et en ce que d'autre part, l'électrode (23) de travail est recouverte d'un matériau conducteur ou est fabriquée dans un matériau conducteur sur lequel se produit l'évolution intensive de l'hydrogène gazeux à des potentiels plus négatifs que les potentiels nécessaires à l'obtention d'un pH de 3,5-9 à proximité de la microbalance (2).

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