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Article
Models for Dispersion in Flow Injection Analysis Part 1. Basic Requirements and Study of Factors Affecting Dispersion
Analyst (1987)
  • Julian Tyson
  • David C. Stone
Abstract
The various approaches adopted for accounting for dispersion behaviour in flow injection analysis are
examined and the advantages of a modelling approach are discussed. The variation of the dispersion
coefficient as a function of (a) flow-rate, (b) tube length, (c) tube inner diameter and (d) method of injection
obtained under typical flow injection conditions are studied and discussed. Explanations for some of the
effects observed are presented in terms of molecular diffusion and convective flow patterns. The advantages
of "time" injection over the more usual "slug" injection are clearly demonstrated and the use of the single
well stirred tank model to describe the relationship between volume injected and dispersion coefficient under
conditions of time injection are examined. The applications of this model to describing the entire curve shape
for slug injection and of the potentially more versatile two-tank model are briefly introduced.
Keywords
  • Flow injection analysis,
  • dispersion coefficient,
  • flow models,
  • time injection
Publication Date
1987
Citation Information
Julian Tyson and David C. Stone. "Models for Dispersion in Flow Injection Analysis Part 1. Basic Requirements and Study of Factors Affecting Dispersion" Analyst Vol. 112 (1987) p. 515
Available at: http://works.bepress.com/julian_tyson/129/