Halide ion-selective devices and methods of determining halides
First Claim
1. In a potentiometric device for the detection of halide ions in a solution under test, said device comprising a layer of silver halide in electrochemical contact with means for making potentiometric measurements related to halide ion concentration, said layer of silver halide in turn bearing a halide ion permeable overlayer of a cellulose ester which inhibits interference due to low molecular weight materials, the improvement comprising the presence in said cellulose ester overlayer of a polyol containing from 2 to 6 hydroxyl groups which results in an extended useful shelf life of said device.
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Abstract
Halide, especially chloride and bromide, ion-sensitive devices which are insensitive to uric acid, and other interfering materials while demonstrating extended shelf lives, are described. Such devices comprise a silver halide layer bearing a thin cellulose ester layer which contains at least one polyol having from 2 to 6 hydroxyl groups.
9 Citations
25 Claims
- 1. In a potentiometric device for the detection of halide ions in a solution under test, said device comprising a layer of silver halide in electrochemical contact with means for making potentiometric measurements related to halide ion concentration, said layer of silver halide in turn bearing a halide ion permeable overlayer of a cellulose ester which inhibits interference due to low molecular weight materials, the improvement comprising the presence in said cellulose ester overlayer of a polyol containing from 2 to 6 hydroxyl groups which results in an extended useful shelf life of said device.
- 5. In a Ag/Ag halide, halide ion-sensitive electrode comprising a layer of silver in electrochemical contact with a layer of silver halide which in turn bears a halide ion permeable overlayer of a cellulose ester which inhibits interference due to low molecular weight materials, the improvement comprising the presence in said cellulose ester overlayer of a polyol containing from 2 to 6 hydroxyl groups, said overlayer resulting in an extended useful shelf life of said electrode.
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13. A Ag/Ag halide, halide ion-sensitive electrode having an extended shelf life comprising a layer of silver in electrochemical contact with a layer of silver halide which in turn bears a halide ion permeable layer of a cellulose ester containing a polyol having from 2 to 6 hydroxyl groups, said polyol being present in said cellulose ester layer in a concentration sufficient to extend the shelf life of said electrode over the shelf life of said electrode not containing said polyol.
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14. A method for determining halide ion concentration in an aqueous solution comprising:
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(a) contacting a halide ion permeable overlayer of a potentiometric halide ion-sensitive device with a sample of said solution, said device comprising a layer of silver halide in electrochemical contact with means for making potentiometric measurements related to halide ion concentration, said layer of silver halide in turn bearing a halide ion permeable overlayer of a cellulose ester containing a polyol having from 2 to 6 hydroxyl groups; and (b) measuring the potential difference between the aqueous solution and the silver halide layer to determine halide ion concentration. - View Dependent Claims (15, 16)
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17. A method for determining halide ion concentration in an aqueous solution comprising:
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(a) contacting a halide ion permeable overlayer of a halide ion-sensitive electrode with a sample of said solution, said electrode comprising a layer of silver which is in electrochemical contact with a layer of silver halide which, in turn, bears as said halide ion-permeable overlayer, a layer of a cellulose ester containing a polyol having from 2 to 6 hydroxyl groups; and (b) measuring the potential difference between the aqueous solution and the silver layer of the electrode. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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- 24. A method of extending the shelf life of a potentiometric halide ion-sensitive device of the type comprising a layer of silver halide bearing a halide ion permeable overlayer of a cellulose ester, which device is to be used with aqueous solution in electrochemical contact with potentiometric measuring means for determining halide ion concentration, said method comprising incorporating in the cellulose ester overlayer a polyol having from 2 to 6 hydroxyl groups.
Specification