公开(公告)号：EP2844993B1

公开(公告)日：2019-12-18

申请号：EP13721511.7

申请日：2013-04-26

申请人： Buckman Laboratories International, Inc

发明人： MCNEEL, Thomas, E. ,  CLARK, Richard, A. ,  LUSK, JR. Richard, D. ,  LIYANAPATIRANA, Chamindu

IPC分类号： G01N27/42

公开(公告)号：EP2844993A1

公开(公告)日：2015-03-11

申请号：EP13721511.7

申请日：2013-04-26

申请人： Buckman Laboratories International, Inc

发明人： MCNEEL, Thomas, E. ,  CLARK, Richard, A. ,  LUSK, JR. Richard, D. ,  LIYANAPATIRANA, Chamindu

IPC分类号： G01N27/42

摘要： A method is provided for measuring an electrolytically-active species concentration in an aqueous or non-aqueous solution for use in providing control of the concentration of the species in a source solution thereof based on the measurements. In the method, a sample containing an electrolytically-active species is added into a measurement cell that has a working electrode and an auxiliary electrode, and a constant current is applied to the measurement cell while the working and auxiliary electrodes are in contact with the sample with monitoring of voltage difference across the electrodes until a change in the voltage difference is detected. A feedback signal is generated based on a parameter of the change in the voltage difference that is directly proportional to the amount of the electrolytically-active species in the sample, which can be used for process control. An apparatus is also described.