Journal of Solution Chemistry

, Volume 1, Issue 5, pp 455–463 | Cite as

A radio-frequency moving-boundary detector

  • Krishnahadi S. Pribadi
Article

Abstract

A new type of moving-boundary detector is described in which boundaries are detected at platinum ring electrodes situated on the outside of a moving-boundary tube. These rings are part of a bridge circuit operating at radio frequencies. Impedance changes in the region of the rings are converted by a phase-sensitive detector to a voltage output which, when operating in the differential mode, takes the form of a sharp peak as a boundary passes through the rings. Boundary displacements of less then 20 μm can be detected, and a precision of better than 0.02% is obtained in the measurement of boundary velocities in typical transference measurements. The fact that only three electrical leads are required in the detecting circuit gives this detector a decided advantage for high-pressure work. Equally important is the elimination of electrode polarization problems associated with other types of electrical detectors.

Key words

Transference numbers high pressure determination of RF detector 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    D. A. MacInnes and L. G. Longsworth,Chem. Rev. 11, 171 (1932).Google Scholar
  2. 2.
    M. Spiro, Determination of Transference Numbers, inPhysical Methods of Organic Chemistry, A. Weissberger, ed. (Interscience, New York, 1959), 3rd ed., Chap XLVI.Google Scholar
  3. 3.
    R. L. Kay, Transference Number Measurements, inTechniques in Electrochemistry, A. Salkind and E. Yeager, eds. (Interscience, New York, 1972), Vol. II, in press.Google Scholar
  4. 4.
    R. L. Kay, G. A. Vidulich, and A. Fratiello,Chem. Instr. 1, 361 (1969).Google Scholar
  5. 5.
    R. L. Kay, K. S. Pribadi, and B. Watson,J. Phys. Chem. 74, 2724 (1970).Google Scholar
  6. 6.
    B. Watson, K. S. Pribadi, and R. L. Kay,J. Solution Chem., to be published.Google Scholar

Copyright information

© Plenum Publishing Corporation 1972

Authors and Affiliations

  • Krishnahadi S. Pribadi
    • 1
  1. 1.Department of ChemistryCarnegie-Mellon UniversityPittsburgh

Personalised recommendations