A digital integrator for controlled-potential coulometry |
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Authors: | Thomas L. Frazzini Michael K. Holland Jon R. Weiss Charles E. Pietri |
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Affiliation: | New Brunswick Laboratory, U.S. Department of Energy, 9800 South Cass Avenue, Argonne. IL 60439 U.S.A. |
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Abstract: | Accurate electrolysis current integration is required in controlled-potential coulometry. Analog integrators have been shown to deviate from ideal response by as much as —0.1%. A digital integrator was designed to optimize the linearity of the voltage-to-frequency converter used, minimize the effects of temperature, eliminate integration errors caused by small polarity changes and signal noise, and allow interchangeability with an analog integrator in a state-of-the-art coulometer widely used throughout the nuclear field for controlled-potential coulometry. Evaluation of the digital integrator, calibrated versus the Faraday, showed bias-free determinations of plutonium with a relative standard deviation of approximately 0.02%. The integrator was designed specifically for use in the controlled-potential coulometric determination of plutonium, but many of the features incorporated can be adopted to digital integrators for other uses where accurate integration over long periods of time is required. |
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