G - Physics – 01 – N
Patent
G - Physics
01
N
324/23
G01N 27/30 (2006.01) G01N 27/403 (2006.01) G01N 27/416 (2006.01)
Patent
CA 1138043
ABSTRACT OF THE DISCLOSURE 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 elec- trodes at least two electrolytic 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 gen- erally smooth cylindrical inner surface. A plurality of electrically discrete active electrode segments are mounted on the inner sur- face of the electrode with their active surfaces substantially flush with the generally smooth cylindrical inner surface. Com- pleting 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 segments 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. ESA-117 CIP
319224
Matson Wayne R.
Vitukevich Ronald
Environmental Sciences Associates Inc.
Macrae & Co.
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