Isocyanurate specific electrode and method of analysis and quaternary ammonium isocyanuric acid salts therefore
First Claim
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1. An electrode specific for the isocyanurate ion and capable of determining isocyanurate ion activity in solutions comprising:
- (a) a platinum conductor covered with a plasticized polyvinyl chloride composition containing a quaternary ammonium isocyanurate salt;
(b) means for electrically connecting the platinum conductor to a pH meter, and(c) means for insulating said platinum conductor from said solution.
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Abstract
An electrode that is specific for the isocyanurate ion, and capable of rapid determination of the free isocyanurate ion activity directly in solution uses as its sensing element a platinum wire covered with a polyvinyl chloride membrane. The membrane is plasticized with a solution of a quaternary ammonium salt of isocyanuric acid. When this electrode and a commercial reference electrode are immersed in a solution containing the isocyanurate ion, a differential voltage proportional to the isocyanurate ion concentration is generated which is detected by a pH meter.
6 Citations
13 Claims
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1. An electrode specific for the isocyanurate ion and capable of determining isocyanurate ion activity in solutions comprising:
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(a) a platinum conductor covered with a plasticized polyvinyl chloride composition containing a quaternary ammonium isocyanurate salt; (b) means for electrically connecting the platinum conductor to a pH meter, and (c) means for insulating said platinum conductor from said solution.
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- 2. An electrode specific for the isocyanurate ion and capable of determining isocyanurate ion activity in solutions comprising a platinum surface, portion of which is covered with a plasticized polyvinyl chloride composition containing a quaternary ammonium isocyanurate salt, said surface which is not covered with said composition being covered by a substance that is impermeable to water and electrical conducting means attached to said electrode.
- 4. An electrode specific for the isocyanurate ion and capable of determining isocyanurate ion activity in solutions comprising a centrally located platinum wire one end of which is coated with a plasticized polyvinyl chloride composition containing a quaternary ammonium isocyanurate salt, said wire being surrounded from the coated end for a distance along the length of the wire by a substance that is impermeable to water.
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6. A platinum redox electrode that has been modified by covering that part of the platinum that is exposed with a plasticized polyvinyl chloride composition containing a quaternary ammonium isocyanurate salt.
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7. An electrochemical method of analyzing an aqueous solution for isocyanurate ion which comprises:
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(a) immersing a reference electrode and a platinum electrode covered with a plasticized polyvinyl chloride resin containing a quaternary ammonium isocyanurate salt in a series of aqueous solutions containing known molar concentrations of isocyanurate ions; (b) measuring the difference in potential between the reference electrode and covered platinum electrode when immersed in each of said solutions; (c) preparing a calibration curve by plotting a function of the molar isocyanurate concentration of each solution against the differential potential developed in that solution; (d) immersing said reference electrode and said platinum electrode in an unknown aqueous solution to be analyzed for isocyanurate activity and measuring the differential voltage developed; and (e) determining from the measured differential voltage and the calibration curve the concentration of isocyanurate ion in said unknown aqueous solution. - View Dependent Claims (8, 9, 10)
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11. A quaternary isocyanuric acid salt having the formula:
- ##STR2## wherein R1, R2, R3 and R4 are alkyl radicals of 1 to 18 carbon atoms and the total number of carbon atoms in all of the alkyl radicals is such that the quaternary ammonium salt is soluble in decanol.
- View Dependent Claims (12, 13)
Specification