公开(公告)号：EP1266210B1

公开(公告)日：2009-04-15

申请号：EP01916179.3

申请日：2001-02-23

Applicant: NALCO CHEMICAL COMPANY

Inventor： SHEVCHENKO, Sergey, M. ,  KOUZNETSOV, Dmitri, L. ,  DUGGIRALA, Prasad, Y.

IPC: G01N27/42 ,  G01N27/00 ,  G01N33/18

CPC classification number: G01N29/30 ,  G01N29/022 ,  G01N29/222 ,  G01N33/1853 ,  G01N2291/0256 ,  G01N2291/0426

Abstract: 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).

公开(公告)号：EP1266210A1

公开(公告)日：2002-12-18

申请号：EP01916179.3

申请日：2001-02-23

Applicant: NALCO CHEMICAL COMPANY

Inventor： SHEVCHENKO, Sergey, M. ,  KOUZNETSOV, Dmitri, L. ,  DUGGIRALA, Prasad, Y.

IPC: G01N27/42

CPC classification number: G01N29/30 ,  G01N29/022 ,  G01N29/222 ,  G01N33/1853 ,  G01N2291/0256 ,  G01N2291/0426

Abstract: 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).