EP0215446A2
Expired / Lapsed
EP
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Device and method for measuring ion activity
Assignee: Fujifilm Holdings Corp
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Filing: 1986-09-11
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Granted: —
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Expires: 2006-09-11
Abstract
Abstract A device for measuring ion activity comprising two multilayer ion-selective half cells in flat form which are arranged on a supporting frame and electrically insulated from each other and which are provided with ion-selective membrane as the outermost layer; a porous bridge capable of absorbing and retaining an aqueous liquid which is arranged in such a manner that said porous bridge covers at least a portion of said both outermost layers of the half cells, and a dry and water-soluble salt provided in the region from the surface of a outermost layer on one of the half cells to the porous bridge on said half cell. A method for measuring ion activity using the device is also disclosed.
Inventors
- 👤 Asaji Kondo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 00:15
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/307
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
109 words
A device for measuring ion activity comprising: two multilayer ion-selective half cells of the same nature in flat form which are arranged on a supporting frame and electrically insulated from each other and which are provided with ion-selective membrane as the outermost layer; a porous bridge capable of absorbing and retaining an aqueous liquid which is arranged in such a manner that said porous bridge covers at least a portion of said both outermost layers of the half cells; and a dry, water-soluble salt provided in the region from the surface of a outermost layer on one of the half cells to the porous bridge on said half cell.
Claim 2
Independent Claim
109 words
A device for measuring ion activity comprising: two multilayer ion-selective half cells of the same nature in flat form which are arranged on a supporting frame and electrically insulated from each other and which are provided with ion-selective membrane as the outermost layer; a porous bridge capable of absorbing and retaining an aqueous liquid which is arranged in such a manner that said porous bridge covers at least a portion of said both outermost layers of the half cells; and a dry, water-soluble salt provided in the region from the surface of a outermost layer on one of the half cells to the porous bridge on said half cell.
Claim 3
Dependent Claim
28 words
The device as claimed in claim 1, wherein the dry, water-soluble salt is incorporated in a portion of the porous bridge on the side of the reference electrode.
Claim 4
Dependent Claim
30 words
The device as claimed in claim 1, wherein the dry, water-soluble salt is provided outside of and in contact with the porous bridge on the side of the reference electrode.
Claim 5
Dependent Claim
35 words
The device as claimed in claim 1, wherein the dry, water-soluble salt is provided in the region between the porous bridge and the surface of the ion-selective membrane on the side of the reference electrode.
Claim 6
Independent Claim
202 words
A method for measuring ion activity using an ion activity measuring device comprising two multilayer ion-selective half cells of the same nature in flat form which are arranged on a supporting frame and electrically insulated from each other and which are provided with ion-selective membrane as the outermost layer, a porous bridge capable of absorbing and retaining an aqueous liquid which is arragned in such a manner that said porous bridge covers at least a portion of said both outermost layers of the half cells, and a dry and water-soluble salt provided in the region from the surface of a outermost layer on one of the half cells to the porous bridge on said half cell which comprises the steps of: spotting an aqueous liquid sample in the region on the side where where the salt is not provided so that the porous bridge absorbs and retains water of the liquid sample, and at least a portion of the salt is dissolved in the water so as to electrically connecting both half cells to each other; simultaneously or thereafter measuring the potential difference between both half cells; and determining the ion activity of the previously specified ion in the aqueous liquid sample.
Claim 7
Independent Claim
202 words
A method for measuring ion activity using an ion activity measuring device comprising two multilayer ion-selective half cells of the same nature in flat form which are arranged on a supporting frame and electrically insulated from each other and which are provided with ion-selective membrane as the outermost layer, a porous bridge capable of absorbing and retaining an aqueous liquid which is arragned in such a manner that said porous bridge covers at least a portion of said both outermost layers of the half cells, and a dry and water-soluble salt provided in the region from the surface of a outermost layer on one of the half cells to the porous bridge on said half cell which comprises the steps of: spotting an aqueous liquid sample in the region on the side where where the salt is not provided so that the porous bridge absorbs and retains water of the liquid sample, and at least a portion of the salt is dissolved in the water so as to electrically connecting both half cells to each other; simultaneously or thereafter measuring the potential difference between both half cells; and determining the ion activity of the previously specified ion in the aqueous liquid sample.
Claim 8
Dependent Claim
43 words
The method for measuring ion activity as claimed in claim 5, wherein the aqueous liquid sample is supplied in such an amount that the water of the aqueous liquid sample dissolves the salt to produce a substantially saturated aqueous solution of the salt.
Claim 9
Dependent Claim
37 words
The method for measuring ion activity as claimed in claim 5, using the ion activity-measuring device wherein the dry, water-soluble salt is incorporated in a portion of the porous bridge on the side of the reference electrode.
References Cited (Backward Citations)
No citation records indexed.
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