An electrode which simultaneously passes current and measures potential, and is chloride selective
Instruments and Techniques
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Summary
The glass pipette normally used for potential measurements in the main duct of the rabbit submaxillary gland is modified. The open tip is closed by melting and a tiny hole of about 20 μm is made into the wall about 3 mm from the closed end. The outside surface, after silvering and chlorinizing, serves as the current passing electrode.
The electrolyte in the lumen contacts the outside via the tiny hole, and is used as the potential measuring electrode. Because of its outside Ag/AgCl coating the electrode can also be used as a combined voltage (lumen) and chloride ion activity (outside surface against lumen) measuring device. The construction and testing of this electrode is described.
Key words
Impedance measurement Cylindrical electrode High frequency Voltage clamp Current clampPreview
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