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Rapid-flow analysis using differential pulse polarography with automatic sampling.

P W Alexander1, H Marpaung

  • 1Department of Analytical Chemistry, University of New South Wales, P.O. Box 1 Kensington, N.S.W., 2033, Australia.

Talanta
|March 1, 1982
PubMed
Summary
This summary is machine-generated.

This study introduces a rapid-flow analysis system using differential pulse polarography for automated lead, zinc, and ascorbic acid determination. The method achieves high-speed sampling and precise analysis without sample deaeration.

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry

Background:

  • Automated analysis of lead, zinc, and ascorbic acid is crucial in various fields.
  • Traditional methods often require sample deaeration, increasing analysis time and complexity.

Purpose of the Study:

  • To develop a rapid-flow analysis system for simultaneous determination of lead, zinc, and ascorbic acid.
  • To evaluate the system's performance, including sampling rate, calibration range, and detection limits.

Main Methods:

  • Utilized differential pulse polarography coupled with a rapid-flow system.
  • Employed a nitrogen-segmented buffer stream for high-speed sampling (up to 180 samples/hr).
  • Used a polarographic flow-cell with a dropping mercury electrode in acetate-buffered solutions.

Main Results:

  • Achieved automated determination of lead, zinc, and ascorbic acid without sample deaeration.
  • Established linear calibration ranges from approximately 0.1 x 10(-4) to 1.0 x 10(-3)M.
  • Reported detection limits of 4.0, 0.8, and 0.2 x 10(-6)M for lead, zinc, and ascorbic acid, respectively.
  • Demonstrated successful analysis of Vitamin C tablets with precision better than 1% RSD at 120 samples/hr.

Conclusions:

  • The developed rapid-flow differential pulse polarography system offers an efficient and automated method for analyzing lead, zinc, and ascorbic acid.
  • The system eliminates the need for sample deaeration and is suitable for routine analysis, including Vitamin C tablets.
  • Further optimization may be needed to address baseline current and noise levels for improved detection limits.