Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1992-06-05
1994-05-17
Gorgos, Kathryn
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
20415323, 2041531, 204405, 204433, 204435, G01N 2726
Patent
active
053125282
ABSTRACT:
The invention relates to a method of determining an ion concentration with the aid of an ion-selective electrode, in which method a known quantity by volume of a sample is taken, a buffer is added and the initial potential of the electrode pair is measured, a known volume having an accurately known ion concentration is added and the potential obtained is measured, the standard solution being added stepwise, and the initial potential of the electrode pair and the slope of the relationship between potential and logarithm of the concentration is calculated for each of the quantities added from the data obtained, a small quantity of the solution to be determined is added, the potential difference is measured and the latter is compared with the required sudden change in potential, after which a sample is again taken and a quantity of the solution to be determined is added which is expected to bring the sudden change in potential into the required region, the potential is then read off and the required concentration is calculated. A description is furthermore given of an apparatus which is suitable for performing said method.
REFERENCES:
patent: 3730685 (1973-05-01), Prohaska
patent: 3738812 (1973-06-01), Berry et al.
patent: 5174872 (1992-12-01), Scott
The Analyst, vol. 103, No. 1225, Apr. 1, 1978, Automatic Titration by Stepwise Addition of Equal Volumes of Titrant, pp. 305-316, By A. Johansson et al.
Dissertation Abstracts International Section B, vol. 50, No. 8, Feb. 1, 1990, by T. R. Berube, p. 3488.
Analytical Chemistry, vol. 51, No. 2, Feb. 1, 1979, Optimizing Precision in Standard Addition Measurement, pp. 232-235, by K. L. Ratzlaff.
Fresenius Zeitschrift Fur Analytische Chemie, vol. 325, 1986, pp. 263-266, Optimizing Precision in Standard Additions Determinations, by M. J. Gardner et al.
Applikon Dependable Instruments B.V.
Bell Bruce F.
Gorgos Kathryn
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