Chemistry: physical processes – Physical processes – Crystallization
Patent
1978-12-11
1980-11-11
Serwin, R. E.
Chemistry: physical processes
Physical processes
Crystallization
204 1T, 204195B, 422 68, G01N 2730, G01N 3348, G01N 3350
Patent
active
042330319
ABSTRACT:
An electrochemical measuring system which effects, measures and sorts charge transfer reactions of selected substances in a sample solution is provided. The system includes a novel electrode which is adapted to measure simultaneously on at least two electrodes at least two electolytic potentials with reference to a reference potential. In a preferred form the electrode comprises a hollow, cylindrical body formed of an electrically insulating material. The electrode is open at least at one end and has a generally smooth cylindrical inner surface. A plurality of electrically discrete active electrode segments are mounted on the inner surface of the electrode with their active surfaces substantially flush with the generally smooth cylindrical inner surface. Completing the electrochemical measuring system are a stirring means for creating a relatively high degree of mixing adjacent the electrode active surfaces, means for charging liquid samples to the cell, and means connecting at least two of the electrically discrete active electrode segments to different electrical potentials. In use a sample to be tested is charged to the cell, and stirring is commenced. One of the electrically discrete active electrode sgements is held at a potential at which a selected substance of interest and also one or more interferring substances responds, while another of the electrode segments is held at a potential at which only the interferring substances respond. The presence of a substance of interest can be determined by subtracting the signals from the one and another electrode segments, and its quantity determined by integrating the signal difference.
REFERENCES:
patent: 3298934 (1967-01-01), Angeleri
patent: 3556950 (1971-01-01), Dahms
patent: 3918910 (1975-11-01), Soya et al.
Matson Wayne R.
Vitukevich Ronald
Environmental Sciences Associates, Inc.
Serwin R. E.
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