IN-SITU COMPENSATION OF CAPACITIVE CHARGING CURRENT IN INCREMENTAL DC POLAROGRAPHY.
Item
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Title
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IN-SITU COMPENSATION OF CAPACITIVE CHARGING CURRENT IN INCREMENTAL DC POLAROGRAPHY.
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Identifier
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AAI8312337
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identifier
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8312337
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Creator
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BRATIN, PETER.
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Contributor
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Joseph Glickstein
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Date
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1983
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Language
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English
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Publisher
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City University of New York.
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Subject
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Chemistry, Analytical
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Abstract
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A new method and computerized instrument for compensation of capacitive charging current in incremental dc polarography or introduced. The incremental charging current is directly proportional to the differential double layer capacitance, which can be measured in-situ, in the presence of faradaic current, by the phase-null technique. This technique eliminates interference of the faradaic current in the range where the compensation is most needed, namely at low concentrations.;The new method offers advantages over existing methods in respect to both, a rigorous theoretical basis and experimental capabilities of versatility and accuracy, including an improved approach to incremental measurements which was necessary to attain good precision in the sub-micromolar range. The performance of the instrument was tested with Zn(II), Cd(II) and Pb(II) solutions, with terms derived directly from experimental measurements. In all cases, for the concentration range between 2 x 10('-7)M and 1 x 10('-5)M, the calibration curves were linear with a standard deviation of the slope better than (+OR-)6%.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Chemistry
