Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For properties of solid material
Patent
1999-03-29
2000-04-18
Tung, T.
Electrolysis: processes, compositions used therein, and methods
Electrolytic analysis or testing
For properties of solid material
204400, 205775, 401198, G01N 2726
Patent
active
060511265
ABSTRACT:
The nature of a metal sample, such as the purity of precious metals and metal alloys, such as gold, is determined using a handheld probe having an electrode embedded in an electrolyte in a reservoir of the probe and arranged to conduct electrically with the sample through the electrolyte and a fibrous tip. The tip can resemble the point of a marker or writing instrument. The tip is in fluid communication with the reservoir containing the electrolyte, and preferably has the electrode embedded therein. An electrical connection with the electrode is made at the rear of the probe. For testing gold purity, the electrode is preferably a thin platinum wire extending through the reservoir and into the tip to just behind the tip surface. A battery is coupled to a calibration potentiometer whereby the voltage on a millivoltmeter is set to full scale when the probe is open circuited. When coupled to the sample in a circuit, the galvanic cell formed by the same, the electrode and the electrolyte reduces the voltage sensed at the meter, as a function of the extent of galvanic action. Preferably the electrolyte is a weak acid including nitric acid and ammonium chloride salt in aqueous solution.
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Tung T.
Wilkinson Charles A.
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