Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For ion concentration
Patent
1994-12-16
1996-12-03
Soderquist, Arlen
Electrolysis: processes, compositions used therein, and methods
Electrolytic analysis or testing
For ion concentration
2057815, 2057895, 2057805, 204416, 204415, 204418, 204409, 204412, 204411, 436 73, 436 74, 436 79, 436110, 436149, 436150, 422 8201, 422 8202, 422 8203, G01N 3320, G01N 2726, G01N 27333
Patent
active
055804411
ABSTRACT:
An ion concentration measuring apparatus for measuring the concentration of a measuring ion in a sample solution containing the measuring ion and an interfering ion having the same ionic charge number as that of the measuring ion. This apparatus comprises a first ion-selective electrode for generating a potential in response to the measuring ion, and a second ion-selective electrode in response to the interfering ion. The first ion-selective electrode is brought about in contact with a first, second and third standard solutions, each containing known concentrations of ions. A selectivity coefficient of the ion-selective electrode is calculated on the basis of the output potential of the first ion-selective electrode. The first and second ion-selective electrodes are brought about in contact with the sample solution. The concentration of the measuring ion in the sample solution is calculated on the basis of the output potential of the first and second ion-selective electrodes which have been obtained through the contact thereof with the sample solution and the selectivity coefficient. A ratio between the concentration of the measuring ion and the interfering ion in the first standard solution being identical to a ratio between the concentration of the measuring ion and the interfering ion in the second standard solution, and not identical to a ratio between the concentration of the measuring ion and the interfering ion in the third standard solution.
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Amemiya Isao
Kikuchi Hiroshi
Sato Noriko
Kabushiki Kaisha Toshiba
Soderquist Arlen
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