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The Diffusion of Passive Tracers in Laminar Shear Flow
08:01

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Published on: May 1, 2018

Laminar dispersion in flow-injection analysis.

J T Vanderslice1, K K Stewart, A G Rosenfeld

  • 1Nutrient Composition Laboratory, Nutrition Institute, Human Nutrition Center, Science and Education Administration, United States Department of Agriculture, Beltsville, MD 20705, U.S.A.

Talanta
|January 1, 1981
PubMed
Summary
This summary is machine-generated.

Simple expressions for dispersion and travel times in flow-injection analysis systems were derived. These findings aid in calculating total residence time and obtaining diffusion coefficients.

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Flow-injection analysis (FIA) is a common technique for sample analysis.
  • Understanding sample dispersion and travel time is crucial for accurate FIA results.

Purpose of the Study:

  • To develop simple expressions for sample dispersion and travel times in FIA systems.
  • To establish a method for calculating total residence time and diffusion coefficients.

Main Methods:

  • Numerical solutions of the diffusion-convection equation were employed.
  • Mathematical expressions for dispersion and travel times were derived.
  • Experimental validation of the derived expressions was performed.

Main Results:

  • Simple expressions for dispersion and travel times were successfully derived.
  • The sum of dispersion and travel time accurately represents total residence time.
  • Experimental results showed agreement with the derived expressions and peak curve shapes.

Conclusions:

  • The derived expressions provide a straightforward method for analyzing FIA systems.
  • This work facilitates the accurate determination of diffusion coefficients.
  • The findings simplify the characterization of sample behavior in FIA.