| 摘要 |
A dynamic precious metal assay which includes the steps of introducing a controlled amount of liquid electrolyte onto a sample of precious metal alloys, placing an inert electrode in contact with the sample in the presence of the electrolyte to create a wet junction, driving a first pulse of electric current through the electrolyte in the wet junction to cause an oxidation/reduction reaction of the alloying materials present in the alloyed sample to form an electrolytic-based paste, terminating the electric current and allowing the current in the paste to decay to an asymptotic level, driving a second pulse of electric current through the electrolytic paste in the junction at an amplitude above the asymptotic level, driving a third pulse of electric current, at a higher amplitude than the second pulse, through the electrolytic paste in the junction, instantaneously measuring the electrolytic conductance of the electrolytic paste, comparing the conductance with an empirical table of electrolytic paste conductance standards, interpolating the conductance by differentiation against the empirical table of standards, and announcing the interpolation. |
