公开(公告)号：US3875037A

公开(公告)日：1975-04-01

申请号：US44348574

申请日：1974-02-19

Applicant: BECKMAN INSTRUMENTS INC

Inventor： KRULL IRWIN H

IPC: G01N27/49 ,  G01N27/46

CPC classification number: G01N27/404

Abstract: An electrode structure having a generally tubular body terminating in a generally cup-shaped end with an axially extending aperture. An insert is provided, the insert having a circumferential shoulder for engaging a circumferential detent within the open end of the body, the engagement being accomplished by providing a plurality of axially extending slots about the periphery of the open end, the fingers so formed deforming under pressure of insertion of the insert until the shoulder engages the detent means. A cap is provided to cover the open end of the tubular body in closing mating relationship to maintain the engagement of the shoulder within the detent. The aperture is closed by means of a membrane in sealing relation with an electrode extending through the insert.

公开(公告)号：US3426599A

公开(公告)日：1969-02-11

申请号：US3426599D

申请日：1966-01-14

Applicant: BECKMAN INSTRUMENTS INC

Inventor： KRULL IRWIN H ,  STERNBERG JAMES C

IPC: G01N30/16 ,  G01N1/24

CPC classification number: G01N30/16

公开(公告)号：US3706649A

公开(公告)日：1972-12-19

申请号：US3706649D

申请日：1970-06-29

Applicant: BECKMAN INSTRUMENTS INC

Inventor： COSGROVE RICHARD E ,  KRULL IRWIN H ,  MASK CHARLES A

IPC: G01N27/333 ,  G01N27/46

CPC classification number: G01N27/3335 ,  G01N2410/10

Abstract: AN ELECTROCHEMICAL ELECTRODE FOR MEASURING THE ION CONCENTRATION OR ACTIVITY OF SOLUTIONS. THE ION SENSITIVE BARRIER OF THE ELECTRODE CONTAINS A MACROCYCLIC COMPOUND, MINERAL OIL, AND A SUFFICIENT AMOUNT OF A COMPOUND LIPID TO RENDER THE BARRIER SUBSTANTIALLY SOLID. PREFERABLY, AN AROMATIC COMPONENT IS INCLUDED IN THE BARRIER TO PROVIDE LONG TERM STABILITY OF THE BARRIER. THE MACROCYCLIC COMPOUND IS PREFERABLY VALINOMYCIN WHEN THE ELECTRODE IS TO BE UTILIZED FOR SELECTIVELY MEASURING THE POTASSIUM ION ACTIVITY OF SOLUTIONS, AND IS PREFERABLY NONACTIN WHEN THE ELECTRODE IS TO BE UTILIZED FOR SELECTIVELY MEASURING THE AMMONIUM ION ACTIVITY OF SOLUTIONS.

公开(公告)号：US3617460A

公开(公告)日：1971-11-02

申请号：US3617460D

申请日：1969-12-17

Applicant: BECKMAN INSTRUMENTS INC

Inventor： KRULL IRWIN H ,  MASK CHARLES A

IPC: G01N27/333 ,  G01N27/46

CPC classification number: G01N27/3335

Abstract: An electrochemical electrode assembly for making ion concentration measurements in which a capillary tube open at its rear end and closed by an ion-sensitive barrier at its forward end is removably mounted in a tubular electrode body. A conductor fixedly mounted at the rear end of the tubular body extends through the open rear end of the capillary tube for connection to an internal half cell immersed in electrolyte in the tube. Due to the surface tension of the electrolyte on the wall of the capillary tube, the electrolyte will not escape through the open end of the tube during normal handling of the electrode assembly. In one embodiment, an organic ion exchanger liquid is provided in the capillary tube between an ion-permeable membrane at the forward end of the tube and the electrolyte in which the half cell is immersed. The surface tension of the two liquids on the wall of the capillary tube ensures that the ion-exchanger liquid will not be displaced by the electrolyte and, therefore, the ion exchanger will remain in contact with the membrane.